A big study of men in Europe gives mixed results about prostate cancer screening that may do little to change minds about its value.

Say you've had a heart attack and your insurer offered you free medicines to help prevent another one. Doctors did that in a major study and were stunned to find that only about half of patients took them.

New study shows Ritalin and similar medicines that millions of children and teens take to curb hyperactivity and boost attention do not raise their risk of serious heart problems.

Scientists advising the government say a Pap test is a good way to screen young and middle-aged women for cervical cancer, and it's only needed once every three years. But they say there is not enough evidence yet to back testing for HPV, the virus that causes the disease.

Two studies this week raised gnawing worries about the safety of vitamin supplements and a host of questions. Should anyone be taking them? Which ones are most risky? And if you do take them, how can you pick the safest ones?

You're sitting in a freshly dry-walled house, drinking coffee from a Styrofoam cup and talking on a cellphone. Which of these is most likely to be a cancer risk?