Sweat is an "evolutionary marvel," says Sarah Everts, the author of The Joy of Sweat. In her new book, Everts delves into the science of perspiration and how this trait has enabled humans to thrive.

Weeks after the Food and Drug Administration approved the Alzheimer's drug Aduhelm, doctors are struggling to figure out who should get the drug and how to use it safely.

A small Israeli study of vaccinated health care workers found that a handful who got infected developed headaches, muscle pain, fatigue and other symptoms of long COVID that lasted for weeks.

The CDC wants vaccinated people to wear masks indoors if the coronavirus is spreading widely where they live. Find out the level of virus transmission in your county.

As Community Health Systems has downsized, what remain are like zombie hospitals – little more than legal entities still taking patients to court even though the new owners don't sue.

Reversing earlier guidance, the agency is encouraging indoor masking for fully vaccinated people under certain circumstances.

Some patients who have had COVID-19 develop symptoms resembling early Alzheimer's. Researchers are trying to figure out whether these people are more likely to develop the disease itself.

Nope, they won't put a microchip in you. And the side effects usually aren't that bad. And if you want to get your HPV shot at the same time, that totally works. Read on for these and more answers.

The agency argues that vaccinated people are safe without masks. But the guidance leaves room for plenty of unvaccinated people to mingle dangerously, and many argue that this is fueling case surges.

Fully vaccinated Olympic athletes and members of Congress have tested positive for the virus. Should you be worried? How common are breakthrough infections, and are they rising?

The Affordable Care Act requires most insurers to cover a comprehensive list of FDA-approved birth control methods at no cost. But insurers often make it hard for women to get the products they want.

With much of the U.S. already sweltering this summer, even avid runners, hikers and bikers are wilting. We've got 10 strategies from experts on how to enjoy hot weather exercise without keeling over.

Evolutionary anthropologist Herman Pontzer shares why some of the most physically active people in the world don't burn more calories than office workers. And what that means for your fitness goals.

The nation's top doctor, Vivek Murthy, says misinformation will keep sowing mistrust and endangering lives unless all Americans do their part to fight it.

The woman had both the alpha and beta variants of the coronavirus, which were found first in the U.K. and South Africa, respectively.