High levels of cortisol in the hair shaft may increase the risk of heart attack, a study shows.

SAM-e plus prescription antidepressants may spell relief for hard-to-treat depression, according to a new study.

Does depression cause weight gain or weight loss? Does weight gain or weight loss cause depression? WebMD helps to unravel the mystery surrounding the link between depression and weight.

You wake up feeling crummy. Should you drag yourself to work and risk infecting coworkers? Or should you phone in sick, even though your boss desperately needs you to pitch in during a stressful week?

The long-term use of oral bisphosphonate osteoporosis drugs such as Actonel, Boniva, and Fosamax may be associated with a doubling in esophageal cancer risk, but the risk to individual users remains small, researchers say.

AP - A leading virus expert urged health authorities around the world Sunday to stay vigilant even though the recent swine flu pandemic was less deadly than expected, warning that bird flu could spark the next global outbreak.

AP - Allergan Inc., the maker of wrinkle-smoothing Botox, has agreed to pay $600 million to settle a yearslong federal investigation into its marketing of the top-selling, botulin-based drug.

AP - Scientists are reporting a major advance in diagnosing tuberculosis: A new test can reveal in less than two hours, with very high accuracy, whether someone has the disease and if it's resistant to the main drug for treating it.