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

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

Howard E. LeWine, MD, Chief Medical Editor, 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

If you’ve been stuck mostly at home with one or more family members over the past year, chances are you’ve gotten on one another’s nerves occasionally. When you’re under a lot of stress, it’s not uncommon say something unkind, or even to lash out in anger to someone you care about. And we all make thoughtless mistakes from time to time, like forgetting a promise or breaking something.

Not sure if you should apologize?

Even if you don’t think what you said or did was so bad, or believe that the other person is actually in the wrong, it’s still important to apologize when you’ve hurt or angered someone. “To preserve or re-establish connections with other people, you have to let go of concerns about right and wrong and try instead to understand the other person’s experience,” says Dr. Ronald Siegel, assistant professor of psychology at Harvard Medical School. That ability is one of the cornerstones of emotional intelligence, which underlies healthy, productive relationships of all types.

How to apologize genuinely

For an apology to be effective, it has to be genuine. A successful apology validates that the other person felt offended, and acknowledges responsibility (you accept that your actions caused the other person pain). You want to convey that you truly feel sorry and care about the person who was hurt, and promise to make amends, including by taking steps to avoid similar mishaps going forward as in the examples below.

According to the late psychiatrist Dr. Aaron Lazare, an apology expert and former chancellor and dean of the University of Massachusetts Medical School, a good apology has four elements:

• Acknowledge the offense. Take responsibility for the offense, whether it was a physical or psychological harm, and confirm that your behavior was not acceptable. Avoid using vague or evasive language, or wording an apology in a way that minimizes the offense or questions whether the victim was really hurt.
• Explain what happened. The challenge here is to explain how the offense occurred without excusing it. In fact, sometimes the best strategy is to say there is no excuse.
• Express remorse. If you regret the error or feel ashamed or humiliated, say so: this is all part of expressing sincere remorse.
• Offer to make amends. For example, if you have damaged someone’s property, have it repaired or replace it. When the offense has hurt someone’s feelings, acknowledge the pain and promise to try to be more sensitive in the future.

Making a heartfelt apology

The words you choose for your apology count. Here are some examples of good and bad apologies.

About the Author

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

Howard E. LeWine, MD, Chief Medical Editor, 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

Feeling sad, anxious, or angry at times is a normal part of the human experience. But do you — or someone you’re close to — seem to experience these and similar emotions more quickly, more frequently, and more intensely than most people?

This problem, known as emotional dysregulation, is a hallmark of many mental health conditions, but especially borderline personality disorder. The most effective treatment for borderline personality disorder is dialectical behavior therapy (DBT), which has also been shown to help people experiencing other issues. What is DBT, who might benefit from this form of therapy, and how is it applied?

What is DBT?

DBT focuses on teaching people skills to manage intense emotions, cope with challenging situations, and improve their relationships. It encourages people to learn and use mindfulness training in practical ways.

During individual and group sessions, therapists encourage a nonjudgmental attitude and emphasize acceptance, compassion, and other aspects of mindfulness.

Who may benefit from DBT?

DBT has a proven track record for addressing the most debilitating symptoms of borderline personality disorder: self-injury and suicide threats or attempts. It is now also used to treat depression, post-traumatic stress disorder, eating disorders, and substance use disorders.

In fact, the cornerstone of DBT — the skills training — can help anyone navigate emotionally charged situations with more ease.

How can mindfulness change how people experience strong emotions?

Many people in therapy have very strong emotions that lead to negative thoughts, says Dr. Blaise Aguirre, a psychiatrist who founded the 3 East Dialectic Behavior Therapy Continuum at Harvard-affiliated McLean Hospital. “They say things like, ‘I’m stupid,’ or ‘I can’t control my anger,’ or ‘No one will ever love me,'” he says.

The mindfulness aspect of DBT teaches people to pay careful attention to the nature, quality, and volume of their thoughts. The idea is to observe these thoughts as separate from yourself without identifying with their meaning. This is the first step to addressing the impact of those thoughts, Dr. Aguirre explains.

How does DBT differ from cognitive behavioral therapy?

DBT is derived from cognitive behavioral therapy (CBT). CBT assumes that certain negative thoughts (cognitions) are distortions, and if you learn how to swap those distorted thoughts with more productive ones, you’ll be less depressed or anxious.

“But for someone with very deep emotions and convictions, telling them that their thoughts and feelings are somehow ‘wrong’ feels very invalidating,” says Dr. Aguirre. A DBT-trained therapist would instead acknowledge that the person’s thoughts make sense, given who they are and their experiences. This practice, known as validation, is a central tenet of DBT. It’s key to know that you can validate a person’s thoughts even if you don’t agree with them.

That concept touches on the core of DBT — the dialectical part. It refers to the idea that two opposite things can be true at the same time. Rather than viewing things in extremes of black and white, DBT encourages people to recognize there’s more than one way to view a situation and to try to “walk the middle path.” A classic DBT mantra is “I’m doing the best that I can in this moment, and I want to and can do better.”

What other skills does DBT rely on?

In addition to mindfulness, DBT teaches three other main skills:

• Distress tolerance is the ability to manage emotional distress in the moment, using techniques such as distraction.
• Emotion regulation involves recognizing, accepting, and managing intense emotions.
• Interpersonal effectiveness focuses on improving communication with other people to strengthen relationships and improve your self-esteem.

What does DBT entail?

Ideally, DBT includes one-on-one sessions with a therapist (who is also available between sessions for phone or text coaching). The one-on-one sessions are combined with weekly group sessions led by a therapist who teaches the specific, interconnected skills and gives homework that helps to reinforce the skills. Participants are encouraged to keep a daily diary to track their emotions, behaviors, reactions, and examples of how they’re practicing their skills.

DBT has been shown to be effective for people ranging from adolescents to older adults with a range of mental health conditions. It appears to be especially useful for adolescents, perhaps for the same reason that it’s easier to learn a language or how to play an instrument when you’re younger rather than older, says Dr. Aguirre.

Are there different options for gaining access to DBT?

Accessing the full DBT experience can be challenging for many people. The skills groups meet for one to two hours weekly for six to 12 months, which is in addition to weekly, hour-long sessions with an individual therapist. Individual therapy may cost as much as $250 to $300 per hour, and the groups are often around $100 per hour. Not all DBT providers accept insurance.

“We’re starting to recognize that the majority of people can improve just doing the skills groups and don’t need the full DBT,” says Dr. Aguirre.

But for teens who are suicidal or harming themselves, intensive DBT can help keep them out of the hospital and potentially save their lives. “If your child had cancer, you wouldn’t think twice about taking them in for chemotherapy infusions twice a week,” says Dr. Aguirre.

Another problem is that there aren’t many DBT-trained providers in less populated parts of the country. Online DBT therapy may be an option, although its effectiveness hasn’t been studied.

Is there one simple DBT tool I can try?

If a family member struggles with very strong emotions, Dr. Aguirre offers this mini-DBT lesson about validation. Situations that trigger intense emotions are often rooted in a perception of abandonment, neglect, or rejection, he says. For example, if a person believes that someone at work is avoiding them, or a romantic partner doesn’t show up on time, it can trigger a rapid rise in emotional distress.

Here’s what to avoid saying:

“You have to calm down.”

“You are making a big deal over nothing.”

“When I am upset, I make myself a nice cup of tea and that should help you, too.”

Here’s what you can say instead:

“You seem really upset. Do you want to talk about it, or do you want some time by yourself?’

“You seem very sad. I am around if you want to talk.”

“Is there anything that I can do to help?”

“These types of statements validate the person’s feelings and convey that you’re listening and open to helping, if that’s what they want,” says Dr. Aguirre.

About the Author

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

Howard E. LeWine, MD, Chief Medical Editor, 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

If you suffer from the throbbing, intense pain set off by migraine headaches, you may well wonder which medicines are most likely to offer relief. A recent study suggests a class of drugs called triptans are the most helpful option, with one particular drug rising to the top.

The study drew on real-world data gleaned from more than three million entries on My Migraine Buddy, a free smartphone app. The app lets users track their migraine attacks and rate the helpfulness of any medications they take.

Dr. Elizabeth Loder, professor of neurology at Harvard Medical School and chief of the Division of Headache at Brigham and Women’s Hospital, helped break down what the researchers looked at and learned that could benefit anyone with migraines.

What did the migraine study look at?

Published in the journal Neurology, the study included self-reported data from about 278,000 people (mostly women) over a six-year period that ended in July 2020. Using the app, participants rated migraine treatments they used as “helpful,” “somewhat helpful,” or “unhelpful.”

The researchers looked at 25 medications from seven drug classes to see which were most helpful for easing migraines. After triptans, the next most helpful drug classes were ergots such as dihydroergotamine (Migranal, Trudhesa) and anti-emetics such as promethazine (Phenergan). The latter help ease nausea, another common migraine symptom.

“I’m always happy to see studies conducted in a real-world setting, and this one is very clever,” says Dr. Loder. The results validate current guideline recommendations for treating migraines, which rank triptans as a first-line choice. “If you had asked me to sit down and make a list of the most helpful migraine medications, it would be very similar to what this study found,” she says.

What else did the study show about migraine pain relievers?

Ibuprofen, an over-the-counter pain reliever sold as Advil and Motrin, was the most frequently used medication in the study. But participants rated it “helpful” only 42% of the time. Only acetaminophen (Tylenol) was less helpful, helping just 37% of the time. A common combination medication containing aspirin, acetaminophen, and caffeine (sold under the brand name Excedrin) worked only slightly better than ibuprofen, or about half the time.

When researchers compared helpfulness of other drugs to ibuprofen, they found:

• Triptans scored five to six times more helpful than ibuprofen. The highest ranked drug, eletriptan, helped 78% of the time. Other triptans, including zolmitriptan (Zomig) and sumatriptan (Imitrex), were helpful 74% and 72% of the time, respectively. In practice, notes Dr. Loder, eletriptan seems to be just a tad better than the other triptans.
• Ergots were rated as three times more helpful than ibuprofen.
• Anti-emetics were 2.5 times as helpful as ibuprofen.

Do people take more than one medicine to ease migraine symptoms?

In this study, two-thirds of migraine attacks were treated with just one drug. About a quarter of the study participants used two drugs, and a smaller number used three or more drugs.

However, researchers weren’t able to tease out the sequence of when people took the drugs. And with anti-nausea drugs, it’s not clear if people were rating their helpfulness on nausea rather than headache, Dr. Loder points out. But it’s a good reminder that for many people who have migraines, nausea and vomiting are a big problem. When that’s the case, different drug formulations can help.

Are pills the only option for migraine relief?

No. For the headache, people can use a nasal spray or injectable version of a triptan rather than pills. Pre-filled syringes, which are injected into the thigh, stomach, or upper arm, are underused among people who have very rapid-onset migraines, says Dr. Loder. “For these people, injectable triptans are a game changer because pills don’t work as fast and might not stay down,” she says.

For nausea, the anti-emetic ondansetron (Zofran) is very effective, but one of the side effects is headache. You’re better off using promethazine or prochlorperazine (Compazine), both of which treat nausea but also help ease headache pain, says Dr. Loder.

Additionally, many anti-nausea drugs are available as rectal suppositories. This is especially helpful for people who have “crash” migraines, which often cause people to wake up vomiting with a migraine, she adds.

What are the limitations of this migraine study?

The data didn’t include information about the timing, sequence, formulation, or dosage of the medications. It also omitted two classes of newer migraine medications — known as gepants and ditans — because there was only limited data on them at the time of the study. These options include

• atogepant (Qulipta) and rimegepant (Nurtec)
• lasmiditan (Reyvow).

“But based on my clinical experience, I don’t think that any of these drugs would do a lot better than the triptans,” says Dr. Loder.

Another shortcoming is the study population: a selected group of people who are able and motivated to use a migraine smartphone app. That suggests their headaches are probably worse than the average person, but that’s exactly the population for whom this information is needed, says Dr. Loder.

“Migraines are most common in young, healthy people who are trying to work and raise children,” she says. It’s good to know that people using this app rate triptans highly, because from a medical point of view, these drugs are well tolerated and have few side effects, she adds.

Are there other helpful takeaways?

Yes. In the study, nearly half the participants said their pain wasn’t adequately treated. A third reported using more than one medicine to manage their migraines.

If you experience these problems, consult a health care provider who can help you find a more effective therapy. “If you’re using over-the-counter drugs, consider trying a prescription triptan,” Dr. Loder says. If nausea and vomiting are a problem for you, be sure to have an anti-nausea drug on hand.

She also recommends using the Migraine Buddy app or the Canadian Migraine Tracker app (both are free), which many of her patients find helpful for tracking their headaches and triggers.

About the Author

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

Howard E. LeWine, MD, Chief Medical Editor, 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

If your fingers or toes ever turn pale (or even ghostly white) and go numb when exposed to cold, you might assume you just have poor circulation. That’s what I used to think when I first started noticing this problem with my own hands many years ago.

It usually happened near the end of a long hike on a spring or fall afternoon, when the temperature dropped and I didn’t have any gloves handy. My pinkie, third, and middle fingers would turn white, and the fingernails took on a bluish tinge. As I soon discovered, I have Raynaud’s phenomenon, an exaggeration of normal blood vessel constriction.

Raynaud’s phenomenon: Beyond poor circulation

When you’re exposed to a cold environment, your body reacts by trying to preserve your core temperature. Blood vessels near the surface of your skin constrict, redirecting blood flow deeper into the body. If you have Raynaud’s phenomenon, this process is more extreme.

Is wintry weather the only trigger for Raynaud’s phenomenon?

“Cold weather is the classic trigger for Raynaud’s phenomenon," says rheumatologist Dr. Robert H. Shmerling, senior faculty editor at Harvard Medical School's Harvard Health Publishing.

"But it can occur any time of year — for example, when you come out of a heated pool, walk into an air-conditioned building, or reach into the freezer section at the supermarket. Even slight changes in air temperature can trigger an episode.”

What happens when an episode occurs?

During an episode, the small arteries supplying the fingers and toes contract spasmodically, hampering the flow of oxygen-rich blood to the skin. Some of these vessels even temporarily collapse, and the skin becomes pale and cool, sometimes blanching to a stark white color.

In addition to the hands, Raynaud’s can also affect the feet. Less often, the nose, lips, and ears.

Is Raynaud’s phenomenon a circulation problem?

Technically, Raynaud’s phenomenon is a circulation problem, but it’s very different than what doctors typically mean by poor circulation, says Dr. Shmerling. Limited or poor circulation usually affects older people whose arteries are narrowed with fatty plaque (known as atherosclerosis). This condition is often caused by high cholesterol, high blood pressure, and smoking.

In contrast, Raynaud’s usually affects younger people (mostly women) without those issues. And the circulation glitch is generally temporary and completely reversible, he adds.

How can you prevent episodes?

As I can attest, the best treatment for this condition is to prevent episodes in the first place, mainly by avoiding sudden or unprotected exposure to cold temperatures. I’ve always bundled up in the winter before heading outside, but now I bring extra layers and gloves even when the temperature might dip even slightly, or the weather may turn rainy or windy. Preheating the car in winter before getting in, and wearing gloves in chilly grocery store aisles, can also help.

Generally, it’s best to avoid behavior and medicines that cause blood vessels to constrict. This includes not smoking and not taking certain medications, such as cold and allergy formulas that contain pseudoephedrine and migraine drugs that contain ergotamine. Emotional stress may also provoke an episode of Raynaud’s, so consider tools and techniques that can help you ease stress, such as mindfulness techniques.

If necessary, your doctor may prescribe a medication that relaxes the blood vessels, usually a calcium-channel blocker such as nifedipine (Adalat, Procardia). If that’s not effective, drugs to treat erectile dysfunction such as sildenafil (Viagra) may help somewhat. Other treatment options include losartan (Cozaar), fluoxetine (Prozac), and topical nitroglycerin. You may only need to use these medications during the cold season, when Raynaud’s tends to be worse.

What steps may help during an episode?

Once an episode starts, it’s important to warm up the affected extremities as quickly as possible. For me, placing my hands under warm running water does the trick.

When that’s not possible, you can put them under your armpits or next to another warm part of your body. When the blood vessels finally relax and blood flow resumes, the skin becomes warm and flushed — and very red. The fingers or toes may throb or tingle.

Is Raynaud’s phenomenon linked to other health problems?

Some people with Raynaud’s phenomenon have other health problems, usually connective tissue disorders such as lupus or scleroderma. Your doctor can determine this by reviewing your symptoms, performing a physical exam, and taking a few blood tests. But most of the time, there is no underlying medical problem.

About the Author

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

Howard E. LeWine, MD, Chief Medical Editor, 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

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

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

Howard E. LeWine, MD, Chief Medical Editor, 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