After canceling a spacewalk planned for Thursday, the space agency’s administrator said it was erring on the side of caution and bringing a crew of four home in the coming days.

NASA said it canceled a spacewalk planned for Thursday after an astronaut had an undisclosed medical issue on the International Space Station.

And what exactly does it mean, anyway?

Now the government’s recommendation is to “limit” drinking, without specifying safe amounts for men and women. The guidelines no longer warn of risks like cancer.

The Trump administration released new dietary guidelines on Wednesday, pushing Americans to prioritize protein and cut back on added sugars and processed foods.

Backers claim the tests can predict a child’s risk of autism using a strand of hair or a mother’s blood, but critics say they are not ready for the market.

Federal health officials now recommend that children be routinely inoculated against 11 diseases, not 17, citing standards in other wealthy nations.

Many shots seem to have “off-target” benefits, such as lowering the risk of dementia, studies have found.

As enhanced subsidies expire, many Americans covered under the Affordable Care Act are having trouble paying for insurance.

Brenna Henn had a long-term grant to study the genetic diversity of Africans and people of African descent. Then her N.I.H. funding was cut.

Now that the condition is known to spread sexually, there are steps you and your partner can take to prevent it.

Gynecologists long viewed bacterial vaginosis as solely a women’s issue — until a study that treated their male partners, too, proved otherwise.

More than 500 women claimed that they had received unnecessary operations. Hospital leaders said they were not aware of a doctor’s misconduct.

The United States is expected to adopt the vaccine schedule used by Denmark, a much smaller country with universal health care.

Ms. Brosseau says mental illness has made her life unbearable. She wants a medically assisted death. Even her psychiatrists are split over whether she should have one.

When the Trump administration slashed foreign aid, it gutted a program that had reduced malaria deaths world wide. In northern Cameroon, health workers scrambled to protect children in one last rainy season.

Recent research highlights that the egg may be the leading lady, but she needs her supporting cast.

The National Kidney Registry has matched thousands of kidney donors with recipients. It has also paid millions of dollars to a company owned by its founder.