Parkinson's disease (PD) is found throughout the world and was described as early as 5000 B.C. in Ayurvedic texts in India. At least 500,000 people in the United States are believed to suffer with PD, with approximately 50,000 new cases diagnosed each year. PD diagnosis, treatment, and follow-up are far from straightforward in this rapidly changing field. Medscape's Parkinson's Disease Resource Center is a collection of the latest medical news and clinical information about PD diagnosis and treatment throughout the course of the disease.