Anatomy at birth may prompt a check in the “male” or “female” box on the birth certificate — but to doctors and scientists, sex and gender aren’t always the same thing.

The Trump administration purportedly is considering defining gender as determined by sex organs at birth, which if a

One out of every seven babies born to U.S. mothers who were infected with Zika during pregnancy developed some kind of health problem, according to the first long-term look at those children.

Hopes are rising again for a drug to alter the course of Alzheimer's disease after decades of failures.

Too few people with signs of mental decline or dementia are getting checked during routine medical visits or told when a problem is found, says a panel of Alzheimer’s disease experts who offered new guidance Sunday.

Government and other scientists are proposing a new way to define Alzheimer’s disease — basing it on biological signs, such as brain changes, rather than memory loss and other symptoms of dementia that are used today.

Think of the worst pill you’ve ever had to take — something big, bitter, and chalky with a terrible aftertaste. Would you rather have to swallow that pill, or a small helping of someone else’s feces?

It’s a scary world out there. But from the moment we are born, an entire battalion is armed and at the ready to offer us protection against the perils of the world around us — and it’s not even human.

Do you really want to eat that second slice of cake?

Oh, no — you look great! I only ask because it may not actually be you who wants it.

Let me explain. What if I told you that there were a few trillion extra cells inside your body scarfing down the food you eat, cont

A deep dive into the controversial use of antibiotics in livestock.