Many arthritis sufferers take herbal supplements, but few know about potentially dangerous interactions with traditional arthritis drugs.

Pessimistic and anxious personalities are associated with the development of Parkinson's disease years down the road, researchers say.

As labs in the U.S. and around the world destroy test kits containing a rare flu virus, the CDC says the virus poses "very low risk" to the public and lab workers.

Cardiac resynchronization may help some (but not all) heart failure patients live longer.

One in three marathon runners drinks more fluids than she or he needs, a study of Boston Marathon runners shows.

Religious practices and spirituality may slow the progression of Alzheimer's disease.

Estrogen loss during childbearing years may increase a woman's risk for Parkinson's disease.