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There are several different types of tremor, including essential tremor, drug-induced tremor, Parkinson's tremor, and tremor due to other conditions such as neuropathy (nerve pain), stroke, liver failure, multiple sclerosis, and high levels of thyroid hormone.
Tremor typically involves the rubbing of the thumb against the forefinger, and is more apparent when the hand is at rest, or you are under stress. In the early stages of the disease it usually only affects one side of the body or one limb. As Parkinson's progresses, tremor may affect other parts of the body. Not every person with Parkinson's disease has tremor. Bradykinesia.