The characteristic symptoms of Parkinson's appeared in ancient Chinese medical texts that described trembling of the hands and shaking of the head. The disorder and its basis has been subjected to considerable analysis over the centuries. Syndromes in which elderly patients suffer from spontaneous shaking, or from other muscular manifestations such as paralysis or tonic spasm, are thought to be the result of yin deficiency of the kidney and liver leading to generation of "internal wind."
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