Parkinson Disease.

Parkinson disease is a common neurodegenerative disorder that causes progressive motor and nonmotor disability. It is diagnosed clinically and requires a detailed history and neurologic examination to exclude alternative diagnoses. Although disease-modifying therapies do not exist for Parkinson disease, effective symptomatic therapies, including dopaminergic medications and surgery, allow patients to maintain good quality of life for many years. Nonmotor symptoms, including mood, cognitive, sleep, autonomic, and gastrointestinal symptoms, should be managed by a multidisciplinary team of clinicians. Recent advances include new diagnostic criteria from the Movement Disorder Society and the addition of new symptomatic therapies for treating motor complications and nonmotor symptoms in advanced disease.