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People in heterosexual relationships are about 20 times less likely to pass HIV to their partners than homosexual men. Now scientists have found a clue to why this disparity exists.

Adding a translation to the English label would require bigger bottles, pharmacists say. They worry patients would wind up carrying a few pills around loose — without any instructions at all.

People are afraid to go to the doctor. Clinics have lost staff to the virus. Basic supplies aren't there. Ebola will have an impact on everything from malaria treatment to maternal health.

Last year the American Medical Association voted to recognize obesity as a disease. But what's in a name? Commentator Tania Lombrozo reviews new evidence that suggests it matters.

The organization of certain brain cells in children with autism seems already different from that of typical children by the sixth or seventh month of fetal development, a study hints.

[UPDATED at 9:45 p.m. ET on April 17]Former first lady Barbara Bush died Tuesday night at her home in Houston at age 92. Days before her death, the…

Mortality rates for Medicare patients don't rise in communities after their hospitals shut down, say Harvard researchers who analyzed 195 closures across the country.

Kids' fast-food habits haven't budged in the past 15 years, a study by the CDC finds. The marketing, cost and taste of fast food still seem to have a hold on America's youth.

And half the world's population doesn't even have access to essential health services, according to a report from the World Bank and the World Health Organization.

In the city of Santa Barbara, north of Los Angeles, the demand for senior housing is so great the wait list is now closed. For many of those seniors, their only safe living option is in their cars.