From now until August, you can sign up for or change coverage through the federal and state health insurance marketplaces. Many people are eligible for better or less expensive plans — or both.

As adults of all ages get access to the COVID-19 vaccines, health researchers worry that the trend could worsen.

As a doctor, I was eligible for the COVID-19 vaccine in December, but I also was pregnant, and there wasn't yet much data to inform my decision. What I needed was a different kind of information.

Drugs that can help keep COVID-19 patients out of the hospital are playing only a small role in Michigan, where the pandemic is accelerating. Logistical challenges are to blame.

With a more contagious variant now dominant in the U.S., the country's genomic surveillance capacity is getting a major boost.

An international team has put human cells into monkey embryos in hopes of finding new ways to produce organs for transplantation. But some ethicists still worry about how such research could go wrong.

For a year, researchers have been studying and arguing over vitamin D's potential for helping protect against or treat COVID-19. The evidence is still not conclusive.

Government health officials are recommending a "pause" in vaccinations with the Johnson & Johnson COVID-19 vaccine. We're answering your questions as we learn more.

From sporting arenas to colleges and cruise ships, many businesses are planning to ask customers to prove they've had their shots. Smartphone apps may be coming soon.

The pandemic has made it harder to exercise and easier to gain weight and delay routine checkups, bad habits that can prime your body for heart disease. These tips can help you get back on track.