Parkinson's disease is a progressive disorder that affects the nervous system and the parts of the body controlled by the nerves. Symptoms start slowly. The first symptom may be a barely noticeable tremor in just one hand. Tremors are common, but the disorder may also cause stiffness or slowing of movement.
Researchers study potential causes and possible treatments for Parkinson's disease. Doctors also conduct research in deep brain stimulation to treat Parkinson's disease and other movement disorders. You may have the opportunity to participate in research studies or clinical trials. Read more about research in: Neurobiology of Parkinson's disease