Although medical researchers still do not agree on the origin of Parkinson's disease, there is no doubt that the immediate cause is damage to cells in a little-known part of the brain. Because of this damage, the victims of parkinsonism suffer from many symptoms that become progressively more severe and disabling: an involuntary tremor or pill-rolling movement of the fingers, rigidity of major limb muscles, hasty gait, slurred speech and difficulty in moving and turning. A parkinsonian patient falls frequently, and he develops a forward-leaning posture to protect him against toppling over backward....
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