|Idiopathic Parkinson's disease (PD) is the second most common neurodegenerative disease after Alzheimer's Disease (AD) and the most frequent subcortical degenerative disease.Parkinson's disease Comprehensive overview covers symptoms, causes, treatment of this progressive movement disorder. It begins usually in the sixth decade and is characterized by rigidity, tremor at rest, slowness of voluntary movement, an expressionless (mask-like) face, stooped posture, and a shuffling, small-step gait. Parkinson's disease pathology is a science that investigates the causes, processes, and effects of Parkinson's disease.
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