Parkinson's disease is a progressive, chronic movement disorder of the brain that affects nearly one million people in the United States. Some 60,000 new cases are diagnosed each year, and many more go undetected. The disease usually begins around age 60. The cause of Parkinson’s disease is unknown, and no cure exists at present. This edition of Physician Focus will discuss the many aspects of Parkinson’s disease - symptoms, effects on health, how it’s diagnosed and treated, and what the prognosis is for patients.