Parkinson's disease is a type of motor system disorder, which means it occurs as a result of a loss of brain cells. Once someone is diagnosed with PD, it may move very slowly, or the onset can be quite sudden and severe. The main symptom of PD is tremors, causing the patient to suffer from trembling in the hands, arms, face, legs and jaw. Other signs of PD are stiff limbs, slow movement, and impaired coordination.
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