Parkinson's Disease - Definition



Parkinson's disease (PD) is a chronic, progressive disorder of the nervous system. A chronic disorder continues for long periods of time, usually many years. Parkinson's disease affects a person's muscular coordination. Symptoms of PD include tremor (shaking), rigidity in some muscles, slow movements, and problems with maintaining normal posture. The disease is caused by the death of cells in one of the movement control centers of the brain. These nerve cells control body movement.

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