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And they’re increasingly common. Here’s what to know about the shared risk factors for these diseases.

If it’s not medically necessary, you may want to consider the risk of antimicrobial resistance.

Millions of patients rely on insulin. But with new drugs, some have been able to lower their doses or stop taking it altogether.

And other questions about parasites.

A mix of bacteria and sweat are likely to blame, experts say. But small changes can go a long way in reducing odors.

Conner Mantz and Clayton Young had run side by side for more than 10,000 miles. Both vied for a place in the marathon at the Paris Games.

Blood tests and “biodata” have entered the fitness space.

The bacteria sickens an estimated 265,000 Americans each year.

After her own mastectomy, sociologist Sarah Thornton sought to answer the question.

Older daters are not getting adequate screening and protection from S.T.I.s. Here’s how to be a safer sexually active senior.