Parkinson disease is a degenerative disorder of the
Parkinson's disease (PD) is a degenerative disorder of the central nervous system that belongs to a group of conditions called movement disorders. It is both chronic, meaning it persists over a long period of time, and progressive, meaning its symptoms grow worse over time.D is the most common form of parkinsonism [1] , in which disorders of other causes produce features and symptoms that closely resemble Parkinsonâs disease. While most forms of parkinsonism have no known cause, there are cases in which the cause is known or suspected or where the symptoms result from another disorder.