Author: xdrqbs

  • New surgery for benign prostate hyperplasia provides long-lasting benefits

    New surgery for benign prostate hyperplasia provides long-lasting benefits

    A row of urinals in a public restroom, with light-colored dividers between them.

    Most men over 50 will develop an enlarged prostate. Also called benign prostatic hyperplasia (BPH), this bothersome condition makes it hard to urinate and can eventually lead to other problems, such as infections, kidney stones, and bladder damage, if left untreated. Many different BPH therapies are available, including medications and various types of surgery.

    One of the newer surgical options, called aquablation, trims excess prostate tissues with highly pressurized jets of saline. Doctors perform aquablation in the operating room while looking at the prostate gland on an ultrasound machine. Patients are put under general anesthesia, so they don’t feel any pain during the procedure.

    Men typically have to urinate through a catheter for about 24 hours after surgery until swelling of the urethra (the tube through which urine flows out of the bladder) subsides. Aquablation is gaining in popularity — in part because, unlike other more traditional BPH treatments, it can preserve normal ejaculation.

    In September, researchers published a study showing that improvements in urinary function from aquablation were still holding up after five years.

    Results of data analysis

    The study assessed long-term data from two clinical trials. The first, called the WATER trial (for Waterjet Ablation Therapy for Endoscopic Resection of Prostate Tissue) launched in 2015 and enrolled 116 men with prostates ranging up to 80 cubic centimeters. The second trial, WATER II, launched in 2017 and enrolled 101 men with prostates ranging between 80 and 150 cubic centimeters. (Normal prostates range from 25 to 30 cubic centimeters in size.) Enrolled patients had a median age of 66 in the WATER study and 68 in WATER II. In addition, 92% of men in the WATER trial were sexually active, as were 75% of the men in WATER II.

    Both clinical trials used the so-called International Prostate Symptom Score (IPSS) to measure treatment-related improvements in urinary functioning and quality of life. Calculated based on how patients rate their symptoms on a standardized questionnaire, IPSS scores fall into three categories: mild symptom scores range from 1 to 7; intermediate symptom scores range from 8 to 18; and scores greater than 19 indicate severe symptoms.

    When they first enrolled in the trials, men in the WATER and WATER II studies reported average IPSS scores of 22.9 and 23.3 respectively. Five years later, the average respective scores were much lower: 7.0 and 6.8. The average length of hospital stay was 1.4 days in the WATER group and 1.6 days for the WATER II group. Only 1% of men were taking BPH medications after five years, and fewer than 5% had been surgically re-treated.

    Another randomized control trial, WATER III, is currently underway in Europe. That trial compares aquablation with a more established type of BPH surgery, prostate enucleation, which uses a laser to remove obstructing tissues. Six-month data reported in 2023 showed that men in either group had comparable symptom improvements.

    However, 98% of men in the prostate enucleation group had ejaculatory dysfunction. That side effect is caused by damage to delicate tissues around the bladder neck that propel semen out of the body. Semen therefore flows back into the bladder, a condition called retrograde ejaculation. None of the men in the aquablation group reported ejaculatory problems.

    A word of caution

    Aquablation can result in extended bleeding, cautions Dr. Heidi Rayala, an assistant professor of urology at Harvard Medical School and a member of the Harvard Medical School Guide to Prostate Diseases advisory board. That’s because unlike other types of surgery for BPH, including prostate enucleation, aquablation doesn’t cauterize tissues with heat. “I tell my patients to expect some blood in the urine for about four to six weeks after the procedure,” Dr. Rayala said.

    Moreover, aquablation may be unsuitable for some men who take blood thinners to prevent blood from clotting, according to Dr. Rayala. Appropriate candidates for the surgery must be able to “safely discontinue anticoagulant medications during post-operative healing, given the bleeding risk,” Dr. Rayala said. Still, aquablation is an excellent option for most men, Dr. Rayala said, especially those with medium to large prostates “who want a durable solution with a lower risk of sexual side effects.”

    “These early results are encouraging, but limited by a relatively small number of patients,” said Dr. Marc Garnick, the Gorman Brothers Professor of Medicine at Harvard Medical School and Beth Israel Deaconess Medical Center, and editor in chief of the Harvard Medical School Guide to Prostate Diseases. “Further evidence with a significantly larger number of patients and longer follow-up will help to support this new method of reducing prostate tissue as an important treatment option.”

    About the Author

    photo of Charlie Schmidt

    Charlie Schmidt, Editor, Harvard Medical School Annual Report on Prostate Diseases

    Charlie Schmidt is an award-winning freelance science writer based in Portland, Maine. In addition to writing for Harvard Health Publishing, Charlie has written for Science magazine, the Journal of the National Cancer Institute, Environmental Health Perspectives, … See Full Bio View all posts by Charlie Schmidt

    About the Reviewer

    photo of Marc B. Garnick, MD

    Marc B. Garnick, MD, Editor in Chief, Harvard Medical School Annual Report on Prostate Diseases; Editorial Advisory Board Member, Harvard Health Publishing

    Dr. Marc B. Garnick is an internationally renowned expert in medical oncology and urologic cancer. A clinical professor of medicine at Harvard Medical School, he also maintains an active clinical practice at Beth Israel Deaconess Medical … See Full Bio View all posts by Marc B. Garnick, MD

  • Measles is making a comeback: Can we stop it?

    Measles is making a comeback: Can we stop it?

    A road sign with the words "Measles Outbreak" in red and black against a wavy white and rusted steel background

    Has the recent news about measles outbreaks in the US surprised you? Didn’t it seem like we were done with measles?

    In the US, widespread vaccination halted the ongoing spread of measles more than 20 years ago, a major public health achievement. Before an effective vaccine was developed in the 1960s, nearly every child in the US got measles. Complications like measles-related pneumonia or hearing loss were common, and 400 to 500 people died each year.

    As I write this, there have been 607 confirmed cases in 21 states, mostly among children. The biggest outbreak is in west Texas, where 56 people have been hospitalized and two unvaccinated school-age children recently died, the first measles deaths in the US since 2015. Officials in New Mexico have also reported a measles-related death.

    Can we prevent these tragedies?

    Measles outbreaks are highly preventable. It’s estimated that when 95% of people in a community are vaccinated, both those individuals and others in their community are protected against measles.

    But nationally, measles vaccination rates among school-age kids fell from 95% in 2019 to 92% in 2023. Within Texas, the kindergarten vaccination rates have dipped below 95% in about half of all state counties. In the community at the center of the west Texas outbreak, the reported rate is 82%. Declining vaccination rates are common in other parts of the US, too, and that leaves many people vulnerable to measles infections.

    Only 2% of the recent cases in the US involved people known to be fully vaccinated. The rest were either unvaccinated or had unknown vaccine status (97%), or they had received only one of the two vaccine doses (1%).

    What to know about measles

    As measles outbreaks occur within more communities, it’s important to understand why this happens — and how to stop it. Here are seven things to know about measles.

    The measles virus is highly contagious

    Several communities have suffered outbreaks in recent years. The measles virus readily spreads from person to person through the air we breathe. It can linger in the air for hours after a sneeze or cough. Estimates suggest nine out of 10 nonimmune people exposed to measles will become infected. Measles is far more contagious than the flu, COVID-19, or even Ebola.

    Early diagnosis is challenging

    It usually takes seven to 14 days for symptoms to show up once a person gets infected. Common early symptoms — fever, cough, runny nose — are similar to other viral infections such as colds or flu. A few days into the illness, painless, tiny white spots in the mouth (called Koplik spots) appear. But they’re easy to miss, and are absent in many cases. A day or two later, a distinctive skin rash develops.

    Unfortunately, a person with measles is highly contagious for days before the Koplik spots or skin rash appear. Very often, others have been exposed by the time measles is diagnosed and precautions are taken.

    Measles can be serious and even fatal

    Measles is not just another cold. A host of complications can develop, including

    • brain inflammation (encephalitis), which can lead to seizures, hearing loss, or intellectual disability
    • pneumonia
    • eye inflammation (and occasionally, vision loss)
    • poor pregnancy outcomes, such as miscarriage
    • subacute sclerosing panencephalitis (SSPE), a rare and lethal disease of the brain that can develop years after the initial measles infection.

    Complications are most common among children under age 5, adults over age 20, pregnant women, and people with an impaired immune system. Measles is fatal in up to three of every 1,000 cases.

    During the latest outbreaks, 74 cases —nearly one in eight — have required hospitalization.

    Getting measles may suppress your immune system

    When you get sick from a viral or bacterial infection, antibodies created by your immune system will later recognize and help mount a defense against these intruders. In 2019, a study at Harvard Medical School (HMS) found that the measles virus may wipe out up to three-quarters of antibodies protecting against viruses or bacteria that a child was previously immune to — anything from strains of the flu to herpesvirus to bacteria that cause pneumonia and skin infections.

    “If your child gets the measles and then gets pneumonia two years later, you wouldn’t necessarily tie the two together. The symptoms of measles itself may be only the tip of the iceberg,” said the study’s first author, Dr. Michael Mina, who was a postdoctoral researcher in the laboratory of geneticist Stephen Elledge at HMS and Brigham and Women’s Hospital at the time of the study.

    In this video, Mina and Elledge discuss their findings.

    Vaccination is highly effective

    Two doses of the current vaccine provide 97% protection — much higher than most other vaccines.  Rarely, a person gets measles despite being fully vaccinated. When that happens, the disease tends to be milder and less likely to spread to others.

    The measles vaccine is safe

     The safety profile of the measles vaccine is excellent. Common side effects include temporary soreness in the arm, low-grade fever, and muscle pain, as is true for most vaccinations. A suggestion that measles or other vaccines cause autism has been convincingly discredited. However, this often-repeated misinformation has contributed to significant vaccine hesitancy and falling rates of vaccination.

    Ways to protect yourself from measles infection

    • Vaccination. Usually, children are given the first dose around age 1 and the second between ages 4 and 6 as part of the Measles-Mumps-Rubella (MMR) vaccine. If a child — or adult — hasn’t been vaccinated, they can have these doses later.

      If you were born after 1957 and received a measles vaccination before 1968, consider getting revaccinated or tested for measles antibodies (see below). The vaccine given before 1968 was less effective than later versions. And before 1957, most people became immune after having measles, although this immunity can wane.

    • Isolation. To limit spread, everyone diagnosed with measles and anyone who might be infected should avoid close contact with others until four days after the rash resolves.
    • Mask-wearing by people with measles can help prevent spread to others. Household members or other close contacts should also wear a mask to avoid getting it.
    • Frequent handwashing helps keep the virus from spreading.
    • Testing. If you aren’t sure about your measles vaccination history or whether you may be vulnerable to infection, consider having a blood test to find out if you’re immune to measles. Memories about past vaccinations can be unreliable, especially if decades have gone by, and immunity can wane.
    • Pre-travel planning. If you are headed to a place where measles is common, make sure you are up to date with vaccinations.

    The bottom line

    While news about measles in recent months may have been a surprise, it’s also alarming. Experts warn that the number of cases (and possibly deaths) are likely to increase. And due to falling vaccination rates, outbreaks are bound to keep occurring. One study estimates that between nine and 15 million children in the US could be susceptible to measles.

    But there’s also good news: we know that measles outbreaks can be contained and the disease itself can be eliminated. Learn how to protect yourself and your family. Engage respectfully with people who are vaccine hesitant: share what you’ve learned from reliable sources about the disease, especially about the well-established safety of vaccination.

    About the Author

    photo of Robert H. Shmerling, MD

    Robert H. Shmerling, MD, Senior Faculty Editor, Harvard Health Publishing; Editorial Advisory Board Member, Harvard Health Publishing

    Dr. Robert H. Shmerling is the former clinical chief of the division of rheumatology at Beth Israel Deaconess Medical Center (BIDMC), and is a current member of the corresponding faculty in medicine at Harvard Medical School. … See Full Bio View all posts by Robert H. Shmerling, MD

  • Should you be tested for inflammation?

    Should you be tested for inflammation?

    A test tube with yellow top is filled with blood and has a blank label. It is lying sideways on top of other test tubes capped in different colors.

    Let’s face it: inflammation has a bad reputation. Much of it is well-deserved. After all, long-term inflammation contributes to chronic illnesses and deaths. If you just relied on headlines for health information, you might think that stamping out inflammation would eliminate cardiovascular disease, cancer, dementia, and perhaps aging itself.

    Unfortunately, that’s not true.

    Still, our understanding of how chronic inflammation can impair health has expanded dramatically in recent years. And with this understanding come three common questions: Could I have inflammation without knowing it? How can I find out if I do? Are there tests for inflammation? Indeed, there are.

    Testing for inflammation

    A number of well-established tests to detect inflammation are commonly used in medical care. But it’s important to note these tests can't distinguish between acute inflammation, which might develop with a cold, pneumonia, or an injury, and the more damaging chronic inflammation that may accompany diabetes, obesity, or an autoimmune disease, among other conditions. Understanding the difference between acute and chronic inflammation is important.

    These are four of the most common tests for inflammation:

    • Erythrocyte sedimentation rate (sed rate or ESR). This test measures how fast red blood cells settle to the bottom of a vertical tube of blood. When inflammation is present the red blood cells fall faster, as higher amounts of proteins in the blood make those cells clump together. While ranges vary by lab, a normal result is typically 20 mm/hr or less, while a value over 100 mm/hr is quite high.
    • C-reactive protein (CRP). This protein made in the liver tends to rise when inflammation is present. A normal value is less than 3 mg/L. A value over 3 mg/L is often used to identify an increased risk of cardiovascular disease, but bodywide inflammation can make CRP rise to 100 mg/L or more.
    • Ferritin. This is a blood protein that reflects the amount of iron stored in the body. It’s most often ordered to evaluate whether an anemic person is iron-deficient, in which case ferritin levels are low. Or, if there is too much iron in the body, ferritin levels may be high. But ferritin levels also rise when inflammation is present. Normal results vary by lab and tend to be a bit higher in men, but a typical normal range is 20 to 200 mcg/L.
    • Fibrinogen. While this protein is most commonly measured to evaluate the status of the blood clotting system, its levels tend to rise when inflammation is present. A normal fibrinogen level is 200 to 400 mg/dL.

    Are tests for inflammation useful?

    In certain situations, tests to measure inflammation can be quite helpful.

    • Diagnosing an inflammatory condition. One example of this is a rare condition called giant cell arteritis, in which the ESR is nearly always elevated. If symptoms such as new, severe headache and jaw pain suggest that a person may have this disease, an elevated ESR can increase the suspicion that the disease is present, while a normal ESR argues against this diagnosis.
    • Monitoring an inflammatory condition. When someone has rheumatoid arthritis, for example, ESR or CRP (or both tests) help determine how active the disease is and how well treatment is working.

    None of these tests is perfect. Sometimes false negative results occur when inflammation actually is present. False positive results may occur when abnormal test results suggest inflammation even when none is present.

    Should you be routinely tested for inflammation?

    Currently, tests of inflammation are not a part of routine medical care for all adults, and expert guidelines do not recommend them.

    CRP testing to assess cardiac risk is encouraged to help decide whether preventive treatment is appropriate for some people (such as those with a risk of a heart attack that is intermediate — that is, neither high nor low). However, for most people evidence suggests that routine CRP testing adds relatively little to assessment using standard risk factors, such as a history of hypertension, diabetes, smoking, high cholesterol, and positive family history of heart disease.

    So far, only one group I know of recommends routine testing for inflammation for all without a specific reason: companies selling inflammation tests directly to consumers.

    Inflammation may be silent — so why not test?

    It’s true that chronic inflammation may not cause specific symptoms. But looking for evidence of inflammation through a blood test without any sense of why it might be there is much less helpful than having routine health care that screens for common causes of silent inflammation, including

    • excess weight
    • diabetes
    • cardiovascular disease (including heart attacks and stroke)
    • hepatitis C and other chronic infections
    • autoimmune disease.

    Standard medical evaluation for most of these conditions does not require testing for inflammation. And your medical team can recommend the right treatments if you do have one of these conditions.

    The bottom line

    Testing for inflammation has its place in medical evaluation, and in monitoring certain health conditions such as rheumatoid arthritis. But it’s not clearly helpful as a routine test for everyone. A better approach is to adopt healthy habits and get routine medical care that can identify and treat the conditions that contribute to harmful inflammation.

    About the Author

    photo of Robert H. Shmerling, MD

    Robert H. Shmerling, MD, Senior Faculty Editor, Harvard Health Publishing; Editorial Advisory Board Member, Harvard Health Publishing

    Dr. Robert H. Shmerling is the former clinical chief of the division of rheumatology at Beth Israel Deaconess Medical Center (BIDMC), and is a current member of the corresponding faculty in medicine at Harvard Medical School. … See Full Bio View all posts by Robert H. Shmerling, MD

  • Why all the buzz about inflammation — and just how bad is it?

    Why all the buzz about inflammation — and just how bad is it?

    Orange and red flames in front of a black background; concept is inflammation

    Quick health quiz: how bad is inflammation for your body?

    You’re forgiven if you think inflammation is very bad. News sources everywhere will tell you it contributes to the top causes of death worldwide. Heart disease, stroke, dementia, and cancer all have been linked to chronic inflammation. And that’s just the short list. So, what can you do to reduce inflammation in your body?

    Good question! Before we get to the answers, though, let’s review what inflammation is — and isn’t.

    Inflammation 101

    Misconceptions abound about inflammation. One standard definition describes inflammation as the body’s response to an injury, allergy, or infection, causing redness, warmth, pain, swelling, and limitation of function. That’s right if we’re talking about a splinter in your finger, bacterial pneumonia, or the rash of poison ivy. But it’s only part of the story, because there’s more than one type of inflammation:

    • Acute inflammation rears up suddenly, lasts days to weeks, and then settles down once the cause, such as an injury or infection, is under control. Generally, acute inflammation is a reaction that attempts to restore the health of the affected area. That’s the type described in the definition above.
    • Chronic inflammation is quite different. It can develop for no medically apparent reason, last a lifetime, and cause harm rather than healing. This type of inflammation is often linked with chronic disease, such as:
      • excess weight
      • diabetes
      • cardiovascular disease, including heart attacks and stroke
      • certain infections, such as hepatitis C
      • autoimmune disease
      • cancer
      • stress, whether psychological or physical.

    Which cells are involved in inflammation?

    The cells involved with both types of inflammation are part of the body’s immune system. That makes sense, because the immune system defends the body from attacks of all kinds.

    Depending on the duration, location, and cause of trouble, a variety of immune cells, such as neutrophils, lymphocytes, and macrophages, rush in to create inflammation. Each type of cell has its own particular role to play, including attacking foreign invaders, creating antibodies, and removing dead cells.

    4 inflammation myths and misconceptions

    Inflammation is the root cause of most modern illness.

    Not so fast. Yes, a number of chronic diseases are accompanied by inflammation. In many cases, controlling that inflammation is an important part of treatment. And it’s true that unchecked inflammation contributes to long-term health problems.

    But inflammation is not the direct cause of most chronic diseases. For example, blood vessel inflammation occurs with atherosclerosis. Yet we don’t know whether chronic inflammation caused this, or whether the key contributors were standard risk factors (such as high cholesterol, diabetes, and smoking — all of which cause inflammation).

    You know when you’re inflamed.

    True for some conditions. People with rheumatoid arthritis, for example, know when their joints are inflamed because they experience more pain, swelling, and stiffness. But the type of inflammation seen in obesity, diabetes, or cardiovascular disease, for example, causes no specific symptoms. Sure, fatigue, brain fog, headaches, and other symptoms are sometimes attributed to inflammation. But plenty of people have those symptoms without inflammation.

    Controlling chronic inflammation would eliminate most chronic disease.

    Not so. Effective treatments typically target the cause of inflammation, rather than just suppressing inflammation itself. For example, a person with rheumatoid arthritis may take steroids or other anti-inflammatory medicines to reduce their symptoms. But to avoid permanent joint damage, they also take a medicine like methotrexate to treat the underlying condition that’s causing inflammation.

    Anti-inflammatory diets or certain foods (blueberries! kale! garlic!) prevent disease by suppressing inflammation.

    While it’s true that some foods and diets are healthier than others, it’s not clear their benefits are due to reducing inflammation. Switching from a typical Western diet to an “anti-inflammatory diet” (such as the Mediterranean diet) improves health in multiple ways. Reducing inflammation is just one of many possible mechanisms.

    The bottom line

    Inflammation isn’t a lone villain cutting short millions of lives each year. The truth is, even if you could completely eliminate inflammation — sorry, not possible — you wouldn’t want to. Among other problems, quashing inflammation would leave you unable to mount an effective response to infections, allergens, toxins or injuries.

    Inflammation is complicated. Acute inflammation is your body’s natural, usually helpful response to injury, infection, or other dangers. But it sometimes sparks problems of its own or spins out of control. We need to better understand what causes inflammation and what prompts it to become chronic. Then we can treat an underlying cause, instead of assigning the blame for every illness to inflammation or hoping that eating individual foods will reduce it.

    There’s no quick or simple fix for unhealthy inflammation. To reduce it, we need to detect, prevent, and treat its underlying causes. Yet there is good news. Most often, inflammation exists in your body for good reason and does what it’s supposed to do. And when it is causing trouble, you can take steps to improve the situation.

    About the Author

    photo of Robert H. Shmerling, MD

    Robert H. Shmerling, MD, Senior Faculty Editor, Harvard Health Publishing; Editorial Advisory Board Member, Harvard Health Publishing

    Dr. Robert H. Shmerling is the former clinical chief of the division of rheumatology at Beth Israel Deaconess Medical Center (BIDMC), and is a current member of the corresponding faculty in medicine at Harvard Medical School. … See Full Bio View all posts by Robert H. Shmerling, MD

  • Feel like you should be drinking less? Start here

    Feel like you should be drinking less? Start here

    White notebook with a yellow sticky note that says Drink Less! pinned to the page by a red thumbtack.

    When experts talk about the dangers of excessive drinking, we often assume those warnings apply mostly to people with alcohol use disorder, a health issue sometimes referred to as alcoholism.

    But people who don’t meet formal criteria for this disorder can still experience toxic effects and suffer other serious harms from alcohol, says Dr. John F. Kelly, professor of psychiatry in addiction medicine at Harvard Medical School. And as research turns up new evidence about alcohol, many people are considering the benefits of drinking less, even if they’re not ready to stop imbibing entirely.

    How does alcohol affect the body?

    That depends on how much you drink. Drinking more than moderate amounts of alcohol (defined as one drink per day for women and two for men) increases your risk for developing

    • liver disease
    • several types of cancer including breast, liver, and colon cancer
    • cardiovascular problems such as high blood pressure and atrial fibrillation.

    What if you’re not drinking daily? “Even people who only drink on weekends can have serious accidents if they become intoxicated — for example, by falling or driving under the influence,” says Dr. Kelly.

    What’s more, growing evidence suggests that even small amounts of alcohol may harm your health.

    How could cutting down on alcohol help you?

    If you’re not ready to give up drinking entirely, cutting back can lower the likelihood of all of these harms. For example, cutting down on alcohol, or stopping entirely, is linked with lower cancer risks, according to a report from the American Association for Cancer Research.

    You might also notice some immediate benefits, like sleeping more soundly, memory improvements, and generally feeling more mentally sharp. And because you’ll be taking in fewer calories, you may also shed some weight.

    Ready to try cutting back on alcohol? Start here

    These five suggestions are a great way to start cutting back.

    Keep a drinking diary

    Tracking how much alcohol you drink and when can help you target your efforts to drink less. It’s also a good idea to put your reasons for cutting back in writing: for example, “I’d like to sleep better,” “I feel sharper,” “Better heart health is important to me.” That practice can reinforce your resolve to follow through with your plan.

    Try alcohol-free days — or even a month of not drinking

    Taking a break from alcohol can be a good way to start, allowing your brain and body to recalibrate. Decide not to drink a day or two each week. You may want to abstain for a week or a month, to see how you feel physically and emotionally without alcohol in your life. Consider doing Sober October — a variation of Dry January.

    Drink slowly and with food

    Sip your drink. Alternate alcoholic drinks with nonalcoholic alternatives like sparkling water, soda, or juice. Don’t drink on an empty stomach, because you’ll feel intoxicated more quickly. That can lower your inhibitions and break your resolve to stick to lower amounts of alcohol, Dr. Kelly says. Drinking with a meal slows alcohol absorption and appears to minimize the drug’s health risks.

    Try low-alcohol or zero-alcohol substitutes

    Alcohol-free beer, nonalcoholic distilled spirits, and similar products have become more widely available in recent years. It’s a result of the alcohol industry’s response to stay profitable, as health harms of small amounts of alcohol have been confirmed and the sober curious movement gains momentum.

    If you drink beer, wine spritzers, hard seltzer, or similar products, check the alcohol content

    While light beers have fewer calories, they don’t necessarily have much less alcohol than regular beer. The average light beer is about 4.3% alcohol, versus 5.0% in regular beer.

    Also, be aware that some craft or specialty beers contain far higher amounts of alcohol — up to 12% or 14% or even higher. Beverages that combine wine or hard liquor with seltzer or other mixers also vary widely in their alcohol content.

    Cut down on temptation

    Two more tips can help you meet success when changing drinking habits.

    Don’t keep alcohol in your house. Making your home an alcohol-free zone takes away the risk of immediate temptation.

    Avoid temptation. Steer clear of people and places that make you want to drink. If you associate drinking with certain events, such as holidays or vacations, make a plan for managing these situations in advance. Check in with your feelings. When you’re worried, lonely, or angry, you might be tempted to reach for a drink. “Think about other ways you might alleviate those feelings, such as going for a walk or calling a friend,” Dr. Kelly suggests.

    Finally, try this interactive tool from the CDC, which can help you make a personalized plan to drink less.

    About the Author

    photo of Julie Corliss

    Julie Corliss, Executive Editor, Harvard Heart Letter

    Julie Corliss is the executive editor of the Harvard Heart Letter. Before working at Harvard, she was a medical writer and editor at HealthNews, a consumer newsletter affiliated with The New England Journal of Medicine. She … See Full Bio View all posts by Julie Corliss

    About the Reviewer

    photo of Howard E. LeWine, MD

    Howard E. LeWine, MD, Chief Medical Editor, Harvard Health Publishing; Editorial Advisory Board Member, Harvard Health Publishing

    Dr. Howard LeWine is a practicing internist at Brigham and Women’s Hospital in Boston, Chief Medical Editor at Harvard Health Publishing, and editor in chief of Harvard Men’s Health Watch. See Full Bio View all posts by Howard E. LeWine, MD

  • Beyond the usual suspects for healthy resolutions

    Beyond the usual suspects for healthy resolutions

    photo of a new pair of white and orange sneakers in a box, viewed from above on a white and orange background with an angled division between the colors

    Early in the new year, promises to reboot your health typically focus on diet, exercise, and weight loss. And by now you may have begun making changes — or at least plans — to reach those goals. But consider going beyond the big three.

    Below are 10 often-overlooked, simple ideas to step up personal health and safety. And most won’t make you break a sweat.

    Review your health portals

    Your medical information is kept in electronic records. You have access to them through the patient portal associated with your doctor’s office. Set aside time to update portal passwords and peruse recent records of appointments, test results, and notes your doctor took during your visits.

    “Many studies have shown that when patients review the notes, they remember far better what went on during interactions with their clinicians, take their medicines more effectively, and pick up on errors — whether it’s an appointment they forgot to make or something their doctor, nurse, or therapist got wrong in documenting an encounter,” says Dr. Tom Delbanco, the John F. Keane & Family Professor of Medicine at Harvard Medical School and cofounder of the OpenNotes initiative, which led shared clinician notes to become the new standard of care.

    Doing this can help you become more engaged in your care. “We know from numerous studies that engaged patients who share decisions with those caring for them have better outcomes,” he adds.

    Ask about health insurance freebies

    Your insurance plan may offer perks that can lead to better health, such as:

    • weight loss cessation programs
    • quit-smoking programs
    • free or reduced gym memberships.

    Some insurers even offer breastfeeding counseling and equipment. Call your insurance company or take a close look at their website to find out if there’s anything that would help you.

    Get rid of expired medications

    Scour your cabinets for expired or unneeded drugs, which pose dangers for you and others. Look for prescription and over-the-counter medications (pills, potions, creams, lotions, droppers, or aerosol cans) as well as supplements (vitamins, minerals, herbs).

    Bring your finds to a drug take-back site, such as a drugstore or law enforcement office, or a medical waste collection site such as the local landfill.

    As a last resort, toss medications into the trash, but only after mixing them with unappealing substances (such as cat litter or used coffee grounds) and placing the mixture in a sealable plastic bag or container.

    Invest in new sneakers

    The wrong equipment can sabotage any exercise routine, and for many people the culprit is a worn pair of sneakers. Inspect yours for holes, flattened arch support, and worn treads. New sneakers could motivate you to jazz up your walking or running routine.

    For example, if it’s in the budget, buy a new pair of walking shoes with a wide toe box, cushy insoles, good arch support, a sturdy heel counter (the part that goes around your heel), stretchy uppers, and the right length — at least half an inch longer than your longest toe.

    Cue up a new health app

    There are more than 350,000 health apps geared toward consumer health. They can help you with everything from managing your medications or chronic disease to providing instruction and prompts for improving diet, sleep, or exercise routines, enhancing mental health, easing stress, practicing mindfulness, and more.

    Hunt for apps that are free or offer a free trial period for a test drive. Look for good reviews, strong privacy guardrails, apps that don’t collect too much information from you, and those that are popular — with hundreds of thousands or millions of downloads.

    Make a schedule for health screenings and visits

    Is it time for a colonoscopy, mammogram, hearing test, prostate check, or comprehensive eye exam? Has it been a while since you had a dermatologist examine the skin on your whole body? Should you have a cholesterol test or other blood work — and when is a bone density test helpful?

    If you’re not sure, call your primary care provider or any specialists on your health team to get answers.

    Four more simple healthy steps

    The list of steps you can take this year to benefit your health can be as long as you’d like it to be. Jot down goals any time you think of them.

    Here are four solid steps to start you off:

    • Take some deep breaths each day. A few minutes of daily slow, deep breathing can help lower your blood pressure and ease stress.
    • Get a new pair of sunglasses if your old ones have worn lenses. Make sure the new pair has UV protection (a special coating) to block the sun’s ultraviolet (UV) light, which can cause eye damage and lead to permanent vision loss.
    • Make a few lunch dates or phone dates with friends you haven’t seen in a while. Being socially connected wards off loneliness and isolation, which can help lower certain health risks.
    • Do a deep cleaning on one room in your home per week. Dust and mold can trigger allergies, asthma, and even illness.

    You don’t have to do all of these activities at once. Just put them on your to-do list, along with the larger resolutions you’re working on. Now you’ll have a curated list of goals of varying sizes. The more goals you reach, the better you’ll feel. And that will make for a very healthy year, indeed.

    About the Author

    photo of Heidi Godman

    Heidi Godman, Executive Editor, Harvard Health Letter

    Heidi Godman is the executive editor of the Harvard Health Letter. Before coming to the Health Letter, she was an award-winning television news anchor and medical reporter for 25 years. Heidi was named a journalism fellow … See Full Bio View all posts by Heidi Godman

    About the Reviewer

    photo of Howard E. LeWine, MD

    Howard E. LeWine, MD, Chief Medical Editor, Harvard Health Publishing; Editorial Advisory Board Member, Harvard Health Publishing

    Dr. Howard LeWine is a practicing internist at Brigham and Women’s Hospital in Boston, Chief Medical Editor at Harvard Health Publishing, and editor in chief of Harvard Men’s Health Watch. See Full Bio View all posts by Howard E. LeWine, MD

  • Alcohol and your health: Risks, benefits, and controversies

    Alcohol and your health: Risks, benefits, and controversies

    Rows of glasses hang upside down above a dimly lit bar, while a row of liquor bottles is visible in the background but out of focus.

    Cheers! Salud! Prost!

    Drinking to one’s health is a common tradition. But it may also be self-defeating: the alcohol that’s part of many toasts can actually harm your health.

    Of course, alcohol consumption extends well past toasts. For millions of people, it’s a regular part of the dining experience, social and sports events, celebrations, and milestones. Alcohol plays a key role in many religious traditions. And the alcoholic beverage industry is a major economic force, responsible for more than $250 billion in sales annually in the US.

    But there are many downsides to drinking: some are likely familiar (spoiler alert: it’s not great for your liver) while others are less well appreciated. And concerns about the risks of even moderate drinking are on the rise.

    The negative effects of alcohol

    Here are some of the most common problems associated with alcohol consumption (especially if excessive):

    • liver disease, including cirrhosis and life-threatening liver failure requiring a liver transplant
    • a higher risk of high blood pressure, heart failure, and dementia
    • an increased risk of cancer (more on this below)
    • a higher risk of injury, especially from drunk driving and falls (homicides and suicides are also often alcohol-related)
    • lapses in judgment — for example, people who are drunk may engage in risky sexual behavior or use other drugs
    • an increased risk of depression, anxiety, and addiction: these problems may impact one’s ability to establish and maintain social relationships and employment
    • fetal alcohol syndrome: alcohol can damage a baby’s developing brain and cause other developmental abnormalities
    • alcohol poisoning: many people don’t realize that if you drink enough alcohol over a short period of time, it can be fatal.

    Heavy drinking can also cause problems well beyond the health of the drinker — it can damage important relationships. It’s all too common that problem drinking disrupts bonds with a spouse, family members, friends, coworkers, or employers.

    Alcohol and cancer: A growing concern

    In recent decades, a number of studies have linked drinking to higher rates of cancer, including cancers involving the

    • liver
    • colon
    • breast
    • mouth
    • throat and esophagus.

    In many cases, even moderate drinking (defined below) appears to increase risk. Despite this, less than half of the US public is aware of any alcohol-cancer connection. That’s why the Surgeon General issued an advisory in January 2025 recommending that alcoholic beverages carry new labels warning of the alcohol-cancer link and highlighting that no safe low level of alcohol consumption has been established. Changing the labels as suggested by the Surgeon General will require congressional action that may never happen.

    Current alcoholic beverage labels in the US warn of the risks of driving under the influence of alcohol, adverse effects on general health, and risks for a developing fetus — but there’s no mention of cancer.

    Are there any health benefits to drinking alcohol?

    Alcohol has long been considered a “social lubricant” because drinking may encourage social interaction. Having a drink while getting together with family or friends is often part of many special occasions.

    And not so long ago there was general consensus that drinking in moderation also came with health advantages, including a reduced risk of cardiovascular disease and diabetes. More recently, this belief has been called into question.

    Even among the positive studies, potential health benefits are often quite small. In addition, alcohol may reduce the risk of one condition (such as cardiovascular disease) while increasing the risk of another (such as cancer). So it’s hard to predict who might actually benefit and who may be harmed more than helped by alcohol consumption. And the balance of risk and benefit likely varies from person to person, based on individual factors such as genetics and lifestyle factors.

    Is drinking some alcohol better than drinking none?

    A number of studies suggest the answer may be yes. For example, a 2018 study found that light drinkers (those consuming one to three drinks per week) had lower rates of cancer or death than those drinking less than one drink per week or none at all.

    More recent studies (all published in 2023) came to similar conclusions. For example:

    • A study of nearly a million people followed for more than 12 years found that abstainers had higher rates of death and chronic disease (including cardiovascular disease, Alzheimer’s disease, and chronic lung disease) than light or moderate drinkers.
    • Researchers reporting on more than half a million people found that nondrinkers had higher rates of death than moderate drinkers.
    • An analysis combining findings from 22 prior studies concluded that people who drank wine had lower rates of cardiovascular disease and related death than those who did not.

    By contrast, another 2023 study found similar rates of death between nondrinkers and light to moderate drinkers.

    It’s worth noting that current guidelines advise against drinking alcohol as a way to improve health.

    How much alcohol is too much?

    The answer to this important question has varied over time, but current US guidelines recommend that men who drink should limit intake to two drinks/day or less and women who drink should have no more than one drink/day. The definitions for a drink in the US are the common serving sizes for beer (12 ounces), wine (5 ounces), or distilled spirits/hard liquor (1.5 ounces).

    A number of experts have recommended revision of the guidelines toward lower amounts, as more studies have linked even moderate alcohol consumption to health risks. Predictably, the alcoholic beverage industry opposes more restrictive guidelines.

    Of course, no one needs to wait for new guidelines or warning labels to curb their drinking. Many are exploring ways to cut back, including the Dry January Challenge or alcohol-free drinks.

    What we don’t know: The significant limitations of alcohol-related health research

    Nearly all large studies regarding alcohol’s impact on health assess associations, not causation. So a higher rate of certain cancers may be associated with more alcohol consumption, but that doesn’t prove alcohol caused the cancer.

    In addition, most rely on self-reporting that may be inaccurate, do not analyze binge drinking, do not assess alcohol consumption over a lifetime, or do not account for the fact that some study subjects may change their alcohol consumption due to alcohol-related health problems. These limitations make it hard to know how much to rely on studies that find health risks (or benefits) to alcohol consumption.

    The bottom line

    Assessing the risks and benefits of alcohol consumption remains an active area of research that may lead to major changes in official guidelines or warning labels.

    But here’s one thing that hasn’t changed: many people like to drink. Even with more restrictive guidelines or new warning labels, it’s likely that plenty of folks will accept the risks of drinking alcohol. Still, it’s important to know what those risks are.

    So, stay tuned. You can expect to hear about more research, debate, and controversy in the near future regarding the potential risks and benefits of drinking, and how much — if any — is ideal.

    About the Author

    photo of Robert H. Shmerling, MD

    Robert H. Shmerling, MD, Senior Faculty Editor, Harvard Health Publishing; Editorial Advisory Board Member, Harvard Health Publishing

    Dr. Robert H. Shmerling is the former clinical chief of the division of rheumatology at Beth Israel Deaconess Medical Center (BIDMC), and is a current member of the corresponding faculty in medicine at Harvard Medical School. … See Full Bio View all posts by Robert H. Shmerling, MD

  • A liquid biopsy for metastatic prostate cancer

    A liquid biopsy for metastatic prostate cancer

    A rack of test tubes with different colored caps, with a gloved hand inserting a tube into the rack; in the background, out of focus, the lab tech's face is slightly visible

    Metastatic prostate cancer can progress in different ways. In some men the disease advances rapidly, while other men have slower-growing cancer and a better prognosis. Researchers are developing various tools for predicting how fast prostate cancer might progress. Among the most promising are assays that count circulating tumor cells (CTCs) in blood samples.

    Prostate cancer spreads by shedding CTCs into the bloodstream, so higher counts in blood generally reflect worse disease. Sometimes referred to as a liquid biopsy, the CTC assay can help doctors decide if patients should get standard or more aggressive treatment. Just one CTC assay is currently on the market for prostate cancer. Called CellSearch, its use is so far limited to men with late-stage metastatic cancer for whom hormonal therapies are no longer effective.

    Using CTC data

    Hormonal therapies block testosterone, a hormone that drives prostate tumors to grow. Research shows that high CTC counts predict poorer survival and faster disease progression among patients with metastatic prostate cancer who become resistant to this form of treatment. But new research shows CTC counts are also predictive for early-stage metastatic prostate cancer that still responds to hormonal therapy.

    Why is that important? Because the earlier doctors can predict a cancer’s trajectory, the better their ability to select patients who could benefit from more powerful (and potentially more aggressive) drug combinations or a clinical trial. Conversely, men who are older or frail might be treated less aggressively if doctors had better insights into their prognosis.

    How the study was done

    The investigators collected blood samples from 503 newly-diagnosed patients with hormonally-sensitive metastatic prostate cancer who had enrolled in a clinical trial with experimental hormonal therapies. The team collected baseline samples at trial registration, and then another set of samples after the treatments were no longer working. CTC counts were divided in three categories:

    • more than 5 CTCs per 7.5 milliliters (mLs) of blood
    • between 1 and 4 CTCs per 7.5 mLs of blood
    • zero CTCs per 7.5 mLs of blood.

    What the research showed

    Results showed that men with higher baseline CTC counts fared worse regardless of which cancer drugs they were taking. Median survival for men with 5 or more CTCs per sample was 27.9 months compared to 56.2 months in men with 1 to 4 CTCs. There weren’t enough patient deaths among those with 0 CTCs to calculate a survival rate.

    Similarly, higher CTC counts predicted faster onset of resistance to hormonal therapy: 11.3 months for men in the highest CTC category, compared to 20.7 months and 59 months for men with 1 to 4 and zero CTCs respectively. Importantly, higher CTC counts correlated with measures of prostate cancer severity, including PSA levels, numbers of metastases in bone, and other indicators.

    Observations and comments

    “This research emphasizes the continued emergence of CTCs in helping to determine outcomes and potentially treatment options for men with metastatic prostate cancer,” said Dr. Marc Garnick, the Gorman Brothers Professor of Medicine at Harvard Medical School and Beth Israel Deaconess Medical Center, and editor in chief of the Harvard Medical School Guide to Prostate Diseases.

    “Still to be determined is how this type of testing compares with more traditional evaluations of disease advancement, such as x-rays, bone scans, and other types of imaging. Ready access to cancer cells in blood that, in turn, eliminate the need for more invasive biopsy procedures of metastatic deposits will be a welcome addition — especially if future studies show that CTCs inform more precise treatment choices.”

    Dr. David Einstein, a medical oncologist specializing in genitourinary cancers at Beth Israel Deaconess Medical Center and assistant professor at Harvard Medical School, agreed with that assessment. “But the Holy Grail is finding predictive biomarkers [like CTCs] that tell you if patients will or will not benefit from particular treatments,” he added. “Answering these types of questions requires randomized clinical trials.”

    About the Author

    photo of Charlie Schmidt

    Charlie Schmidt, Editor, Harvard Medical School Annual Report on Prostate Diseases

    Charlie Schmidt is an award-winning freelance science writer based in Portland, Maine. In addition to writing for Harvard Health Publishing, Charlie has written for Science magazine, the Journal of the National Cancer Institute, Environmental Health Perspectives, … See Full Bio View all posts by Charlie Schmidt

    About the Reviewer

    photo of Marc B. Garnick, MD

    Marc B. Garnick, MD, Editor in Chief, Harvard Medical School Annual Report on Prostate Diseases; Editorial Advisory Board Member, Harvard Health Publishing

    Dr. Marc B. Garnick is an internationally renowned expert in medical oncology and urologic cancer. A clinical professor of medicine at Harvard Medical School, he also maintains an active clinical practice at Beth Israel Deaconess Medical … See Full Bio View all posts by Marc B. Garnick, MD

  • A muscle-building obsession in boys: What to know and do

    A muscle-building obsession in boys: What to know and do

    A shadowy, heavily-muscled superhero in a red cape strikes an action pose against a red and orange background; concept is body dysmorphic disorder

    By the time boys are 8 or 10, they’re steeped in Marvel action heroes with bulging, oversized muscles and rock-hard abs. By adolescence, they’re deluged with social media streams of bulked-up male bodies.

    The underlying messages about power and worth prompt many boys to worry and wonder about how to measure up. Sometimes, negative thoughts and concerns even interfere with daily life, a mental health issue known body dysmorphic disorder, or body dysmorphia. The most common form of this in boys is muscle dysmorphia.

    What is muscle dysmorphia?

    Muscle dysmorphia is marked by preoccupation with a muscular and lean physique. While the more extreme behaviors that define this disorder appear only in a small percentage of boys and young men, it may color the mindset of many more.

    Nearly a quarter of boys and young men engage in some type of muscle-building behaviors. “About 60% of young boys in the United States mention changing their diet to become more muscular,” says Dr. Gabriela Vargas, director of the Young Men’s Health website at Boston Children’s Hospital. “While that may not meet the diagnostic criteria of muscle dysmorphia disorder, it’s impacting a lot of young men.”

    “There’s a social norm that equates muscularity with masculinity,” Dr. Vargas adds. “Even Halloween costumes for 4- and 5-year-old boys now have padding for six-pack abs. There’s constant messaging that this is what their bodies should look like.”

    Does body dysmorphic disorder differ in boys and girls?

    Long believed to be the domain of girls, body dysmorphia can take the form of eating disorders such as anorexia or bulimia. Technically, muscle dysmorphia is not an eating disorder. But it is far more pervasive in males — and insidious.

    “The common notion is that body dysmorphia just affects girls and isn’t a male issue,” Dr. Vargas says. “Because of that, these unhealthy behaviors in boys often go overlooked.”

    What are the signs of body dysmorphia in boys?

    Parents may have a tough time discerning whether their son is merely being a teen or veering into dangerous territory. Dr. Vargas advises parents to look for these red flags:

    • Marked change in physical routines, such as going from working out once a day to spending hours working out every day.
    • Following regimented workouts or meals, including limiting the foods they’re eating or concentrating heavily on high-protein options.
    • Disrupting normal activities, such as spending time with friends, to work out instead.
    • Obsessively taking photos of their muscles or abdomen to track “improvement.”
    • Weighing himself multiple times a day.
    • Dressing to highlight a more muscular physique, or wearing baggier clothes to hide their physique because they don’t think it’s good enough.

    “Nearly everyone has been on a diet,” Dr. Vargas says. “The difference with this is persistence — they don’t just try it for a week and then decide it’s not for them. These boys are doing this for weeks to months, and they’re not flexible in changing their behaviors.”

    What are the health dangers of muscle dysmorphia in boys?

    Extreme behaviors can pose physical and mental health risks.

    For example, unregulated protein powders and supplements boys turn to in hopes of quickly bulking up muscles may be adulterated with stimulants or even anabolic steroids. “With that comes an increased risk of stroke, heart palpitations, high blood pressure, and liver injury,” notes Dr. Vargas.

    Some boys also attempt to gain muscle through a “bulk and cut” regimen, with periods of rapid weight gain followed by periods of extreme calorie limitation. This can affect long-term muscle and bone development and lead to irregular heartbeat and lower testosterone levels.

    “Even in a best-case scenario, eating too much protein can lead to a lot of intestinal distress, such as diarrhea, or to kidney injury, since our kidneys are not meant to filter out excessive amounts of protein,” Dr. Vargas says.

    The psychological fallout can also be dramatic. Depression and suicidal thoughts are more common in people who are malnourished, which may occur when boys drastically cut calories or neglect entire food groups. Additionally, as they try to achieve unrealistic ideals, they may constantly feel like they’re not good enough.

    How can parents encourage a healthy body image in boys?

    These tips can help:

    • Gather for family meals. Schedules can be tricky. Yet considerable research shows physical and mental health benefits flow from sitting down together for meals, including a greater likelihood of children being an appropriate weight for their body type.
    • Don’t comment on body shape or size. “It’s a lot easier said than done, but this means your own body, your child’s, or others in the community,” says Dr. Vargas.
    • Frame nutrition and exercise as meaningful for health. When you talk with your son about what you eat or your exercise routine, don’t tie hoped-for results to body shape or size.
    • Communicate openly. “If your son says he wants to exercise more or increase his protein intake, ask why — for his overall health, or a specific body ideal?”
    • Don’t buy protein supplements. It’s harder for boys to obtain them when parents won’t allow them in the house. “One alternative is to talk with your son’s primary care doctor or a dietitian, who can be a great resource on how to get protein through regular foods,” Dr. Vargas says.

    About the Author

    photo of Maureen Salamon

    Maureen Salamon, Executive Editor, Harvard Women's Health Watch

    Maureen Salamon is executive editor of Harvard Women’s Health Watch. She began her career as a newspaper reporter and later covered health and medicine for a wide variety of websites, magazines, and hospitals. Her work has … See Full Bio View all posts by Maureen Salamon

    About the Reviewer

    photo of Howard E. LeWine, MD

    Howard E. LeWine, MD, Chief Medical Editor, Harvard Health Publishing; Editorial Advisory Board Member, Harvard Health Publishing

    Dr. Howard LeWine is a practicing internist at Brigham and Women’s Hospital in Boston, Chief Medical Editor at Harvard Health Publishing, and editor in chief of Harvard Men’s Health Watch. See Full Bio View all posts by Howard E. LeWine, MD

  • Shining light on night blindness

    Shining light on night blindness

    A dangerously blurry view of cars, streetlights, headlights through a car window at night; concept is night blindness

    Animals renowned for their outstanding night vision include owls, cats, tarsiers (a tiny primate in Southeast Asia) — and even the dung beetle.

    But humans? Not so much.

    Over time, many people suffer from night blindness, also known as nyctalopia. This condition makes seeing in dim or dark settings difficult because your eyes cannot adjust to changes in brightness or detect light.

    What are the dangers for those experiencing night blindness?

    Night blindness is especially problematic and dangerous when driving. Your eyes cannot adjust between darkness and the headlights of oncoming vehicles, other cars may appear out of focus, and your depth perception becomes impaired, which makes it difficult to judge distances.

    Night blindness also may affect your sight at home by making it hard for your vision to quickly adjust to a dark room after turning off the lights. “This can cause people to bump into furniture or trip and suffer an injury,” says Dr. Isabel Deakins, an optometrist with Harvard-affiliated Massachusetts Eye and Ear.

    What happens in the eye to create night blindness?

    The ability to see in low-light conditions involves two structures in the eye: the retina and the iris.

    The retina, located in the back of the eye, contains two types of light-detecting cells called cones and rods. The cones handle color vision and fine details while the rods manage vision in dim light.

    The iris is the colored part of your eye. It contains muscles that widen or narrow the opening of your pupil to adjust how much light can enter your eyes.

    If your irises don’t properly react, the pupils can dilate and let in too much light, which causes light sensitivity and makes it hard to see in bright light. Or your pupils may remain too small and not allow in enough light, making it tough to see in low light.

    What causes night blindness?

    Night blindness is not a disease but a symptom of other conditions. “It’s like having a bruise on your body. Something else causes it,” says Dr. Deakins.

    Several conditions can cause night blindness. For instance, medications, such as antidepressants, antihistamines, and antipsychotics, can affect pupil size and how much light enters the eye.

    Eye conditions that can cause night blindness include:

    • glaucoma, a disease that damages the eye’s optic nerves and blood vessels
    • cataracts, cloudy areas in the lens that distort or block the passage of light through the lens
    • dry eye syndrome.

    However, one issue that raises the risk of night blindness that you can’t control is age. “Our eyes react more slowly to light changes as we age, and vision naturally declines over time,” says Dr. Deakins.  “The number of rods in our eyes diminish, pupils get smaller, and the muscles of the irises weaken.”

    What helps if you have night blindness?

    If you notice any signs of night blindness, avoid driving and get checked by an eye care specialist like an optometrist or ophthalmologist. An eye exam can determine if your eyeglass prescription needs to be updated.

    “Often, a prescription change is enough to reduce glare when driving at night," says Dr. Deakins. “You may even need separate glasses with a stronger eye prescription that you wear only when driving at night.”

    Adding an anti-reflective coating to your lens may help to cut down on the glare of the headlights of an oncoming car. However, skip the over-the-counter polarized driving glasses sold at many drug stores. "These may help cut down on glare, but they don't address the causes of night blindness," says Dr. Deakins.

    An eye exam also will identify glaucoma or cataracts, which can be treated. Glaucoma treatments include eyedrops, laser treatment, or surgery. Cataracts are corrected with surgery to replace the clouded lens with an artificial one. Your eye care specialist can also help identify dry eye and recommend treatment.

    Ask your primary care clinician or a pharmacist if any medications that you take may cause night blindness. If so, it may be possible to adjust the dose or switch to another drug.

    Three more ways to make night driving safer

    You also can take steps to make night driving safer. For example:

    • Wash the lenses of your glasses regularly. And take them to an optician to buff out minor scratches.
    • Keep both sides of your front and rear car windshields clean so that you can see as clearly as possible.
    • Dim your dashboard lights, which cause glare, and use the night setting on your rearview mirror.

    About the Author

    photo of Matthew Solan

    Matthew Solan, Executive Editor, Harvard Men's Health Watch

    Matthew Solan is the executive editor of Harvard Men’s Health Watch. He previously served as executive editor for UCLA Health’s Healthy Years and as a contributor to Duke Medicine’s Health News and Weill Cornell Medical College’s … See Full Bio View all posts by Matthew Solan

    About the Reviewer

    photo of Howard E. LeWine, MD

    Howard E. LeWine, MD, Chief Medical Editor, Harvard Health Publishing; Editorial Advisory Board Member, Harvard Health Publishing

    Dr. Howard LeWine is a practicing internist at Brigham and Women’s Hospital in Boston, Chief Medical Editor at Harvard Health Publishing, and editor in chief of Harvard Men’s Health Watch. See Full Bio View all posts by Howard E. LeWine, MD