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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.
Parkinson's tremor is a low-frequency rest tremor typically defined as a pill-rolling tremor. Some patients also have postural and action tremors. Parkinson's tremor usually occurs in association with other symptoms, such as micrographia, slowness (bradykinesia), and rigidity. Usually, there is no family history of Parkinson's tremor, and alcohol consumption does not decrease movement (see Table 1).