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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."
According to the theoretical understanding of aging, over time, the yin essence of the kidney and liver declines, and this leads to common signs of old age, such as drying of body fluids, fragility of body structures, graying of the hair, wrinkling of the skin, loosening of the teeth, and withering of the flesh. The basic text of Chinese medical theory, Neijing Suwen (ca. 100 A.D.), says that "One who is over 40 years of age will have his yin half-reduced." In ancient descriptions of trembling of hands and shaking of the head, and stiffening of the muscles, it is mentioned that these symptoms are a manifestation of wind and involve the liver organ system. The Neijing says: "All kinds of wind and dizziness are associated with the liver; all kinds of sudden stiffness are associated with wind." In order for the blood and yin of the liver to be full, the kidney essence must be adequate, as it is the source of the liver yin. The decline of kidney and liver functions have a common origin in the aging process in which kidney yin (or kidney essence) is reduced.
