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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 is usually the first symptom of Parkinson's disease. At the onset of Parkinson's disease, tremor affects one side of the body. Most commonly, one of the hands is affected, although tremor may first appear in the jaw or foot. A Parkinson's disease tremor is a resting tremor, meaning it is worst at rest and improves with intentional movement--the opposite of essential tremor.