Parkinson's disease is a neurodegenerative disease that affects the peripheral and central nervous system. In addition to the motor symptoms, a large number of nonmotor symptoms, which are of high clinical relevance, occur in all disease stages. Particular attention has been paid to neuropsychiatric and autonomic disorders in recent years. Among the neuropsychiatric disorders are depression, cognitive loss as well as psychoses and impulsive control disorders. Regarding autonomic function, all areas can be affected, with cardiovascular, gastrointestinal and urogenital disorders and symptoms being the most common. Therapy is difficult and requires an interdisciplinary approach. There is a considerable diagnostic and therapeutic need in the field of nonmotor disorders.