The World Health Organization says it doesn't have enough information to know if it is winning the fight against drug-resistant tuberculosis.

If you have a heart-zapping defibrillator implanted in your chest but now are dying of something else, when do you have it turned off?

A year after kicking the habit, smokers' arteries showed signs of reversing a problem that can set the stage for heart disease, according to the first big study to test this.

New HIV infections are increasing among homosexuals, drug users and prostitutes who don't seek help because of laws that criminalize these practices, the head of the U.N. AIDS agency said Monday.

Stock market slides may hurt more than your savings. New research suggests they might prompt heart attacks.

Key results from a landmark federal study are in, and the results are disappointing for diabetics: Adding drugs to drive blood pressure and blood-fats lower than current targets did not prevent heart problems, and in some cases caused harmful side effects.

Many Americans with leaky heart valves soon might be able to get them fixed without open-heart surgery. A study showed that a tiny clip implanted through an artery was safer and nearly as effective as surgery, doctors reported Sunday.

Stock market slides may hurt more than your savings. New research suggests they might prompt heart attacks.

The Food and Drug Administration is adding its strongest warning to the label for Plavix, cautioning that some patients do not respond to the blockbuster blood thinner.

Too much cancer screening, too many heart tests, too many cesarean sections. A spate of recent reports suggest that too many Americans - maybe even President Barack Obama - are being overtreated.

A troublingly high number of U.S. patients who are given angiograms to check for heart disease turn out not to have a significant problem, according to the latest study to suggest Americans get an excess of medical tests.

Men are more likely than women to be interested in sex, have sex and enjoy sex, according to new scientific research, which also found people who stay active and healthy enjoy longer sex lives.

Children inherit about 30 mutated genes from each parent, fewer than had been thought, but enough in at least one case to pass on inherited illnesses, according to a first detailed look at the blueprint for human life in a family.

Too many pregnant women who want to avoid a repeat cesarean delivery are being denied the chance, concludes a government panel.