What’s a concussion? How many is too many? What if I hit my head on a door?

Experts say there’s no “magic number.” But you should avoid racking up repetitive brain injuries, which could lead to long-term health problems.

By Teddy AmenabarOctober 4, 2022

Ask a Doctor: Why do I pee so much at night?

Waking up once to urinate usually isn't a cause for concern, but anything beyond that may be worth looking into.

By Petar Bajic, MDOctober 3, 2022

Women said coronavirus shots affect periods. New study shows they’re right.

A coronavirus vaccination can change the timing of when you get your period, according to new research. For most people in the study, the effect was temporary.

By Amanda MorrisSeptember 27, 2022

Syphilis cases are surging. Should I be worried?

The sexually transmitted disease can mimic other illnesses and many people don’t know they have it. Here’s what you need to know.

By Teddy AmenabarSeptember 27, 2022

Ask a Doctor: Why do I get sleepy in the afternoon after eating lunch?

Feeling sleepy after lunch is very common and usually isn't a reason for concern. The most likely cause: your circadian rhythm.

By Lydia Kang, MDSeptember 26, 2022

Have you been taking pills wrong? Here’s what science says.

Researchers found that taking a pill while lying on your right side, rather than your left, shortens the time it takes for the drug to be absorbed.

By Teddy Amenabar and Aaron SteckelbergSeptember 21, 2022

When should I get the omicron booster? Will I need covid shots forever?

The omicron shots are here. Here's what to know about when to get the bivalent boosters and how soon they'll work.

By Teddy AmenabarSeptember 19, 2022

Ask a Doctor: Why are so many viruses popping up again?

Reports of monkeypox, Ebola, polio and the ongoing covid-19 pandemic are unnerving but not surprising.

By Jay K. Varma, MDSeptember 19, 2022

Is it safe to take a baby to a chiropractor? Here’s what experts say.

Chiropractors say treatments for infants are safe and gentle. Some physicians say the proliferation of infant chiropractic care on social media is concerning.

By Teddy AmenabarSeptember 15, 2022

How sitting all day can cause health problems — even if you exercise

Working out for 30 minutes every day “might not be enough” to counter the health issues created by prolonged sitting, said the study author.

By Gretchen ReynoldsSeptember 14, 2022

A congressman wasn’t allowed on a flight — because of his wheelchair

Officials say the lithium-ion battery that powers wheelchairs is safe. But passengers like Rep. Jim Langevin can be stranded when airline workers don't know the rules.

By Amanda MorrisSeptember 12, 2022

Ask a Doctor: How much vitamin D do I need? Should I take a supplement?

Vitamin D has been touted as a miracle supplement, but the vast majority of U.S. adults are already getting enough from their diet and the sun.

By JoAnn E. Manson, MDSeptember 12, 2022

Here’s what muscle memory really means, and how to use it

It turns out that muscle memory is not just in the mind. It's in the muscle fibers, too.

By Stacey ColinoAugust 9, 2022

Why adult acne is on the rise and what to do about it

Adult acne has always existed, but masks and stress are making it worse.

By Stacey ColinoJune 21, 2022

‘Body doubling,’ an ADHD productivity tool, is flourishing online

People searching for a way to stay motivated while doing chores or working from home are turning to virtual co-working spaces and live streams for “body doubling.”

By Kelsey AblesJune 1, 2022

The troubled legacy of feminine care products

Amid criticism of the Honey Pot Company and its feminine wash products, experts asked: Why do Black women use these products — which are widely considered unnecessary and can potentially be harmful — more?

By Allyson Chiu and Amber FergusonMay 31, 2022

Menstrual leave: Why some companies are offering time off for periods

Menstrual leave policies are designed to eliminate the taboo around periods and recognize the physical discomforts that menstruation can cause.

By Angela HauptMay 25, 2022

Growing evidence links air pollution exposure and covid-19 risks

More studies conducted during the pandemic have found links between air pollution exposure and the chances of contracting the coronavirus, developing a severe infection or dying.

By Allyson ChiuMay 13, 2022

Waist trainers: A waste of money and potentially harmful

Waist trainers can restrict your breathing, cause digestive issues and perhaps even damage your internal organs.

By Angela HauptMay 10, 2022

How stress can damage your brain and body

Experts describe how long-term stress can lead to serious physical consequences such as cardiovascular disease, inflammation and gastrointestinal problems.

By Stacey ColinoApril 26, 2022