Parkinson's disease is an age-related degenerative disorder of the human brain. It rarely arises before the age of 40, but afflicts more than 1% of people over 60 and 4% of people over 80. The most obvious symptoms are movement-related, including shaking, rigidity, slowness of movement and difficulty with walking gait. Cognitive, sensory, sleep and emotional problems may also occur, especially in the later stages. The most noticeable symptoms are brought about by the death of brain cells that produce the chemical dopamine.
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