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Ordinary calcium supplements taken by the elderly to strengthen bones may boost the risk of heart attacks, according to a study released Friday.

The US Army on Thursday said leadership and discipline have deteriorated at bases in the United States, with officers missing warning signs of soldiers on the verge of suicide.

Scientists have shown for the first time that it may be possible to replace a human hip or knee with a joint grown naturally inside the body using the patient's stem cells.

Charlene Cotton will talk to anyone about sex. Several days a week she stands behind a table decorated with a bowl of flavored condoms and safer sex pamphlets, calling to women passing on the street, “Come check out my table. Don’t be scared.”

More bystanders are willing to attempt CPR if an emergency dispatcher gives them firm and direct instructions — especially if they can just press on the chest and skip the mouth-to-mouth, according to new research.

New research shows that babies born to methamphetamine-using moms face much higher risks of serious complications, compared to babies not exposed in the womb to this illegal street drug.

A fleet of 6,000 bicycles for hire will hit the streets of central London on Friday when the city's mayor Boris Johnson launches a scheme intended to fuel a cycling revolution in the congested capital.

Pregnant women with a history of pregnancy-related diabetes, also called gestational diabetes, have a good chance of developing the condition again, suggests a large new study.

Overweight volunteers who took Orexigen's experimental drug Contrave, designed to reduce cravings, lost about 13 pounds (6 kg) over a year, U.S. researchers reported on Thursday.

Children and teenagers exposed to secondhand smoke at home may get poorer grades than their peers from smoke-free homes, a study of Hong Kong students suggests.