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A cerebellar tremor is a type of intention tremor caused by lesions or damage to the cerebellum from a stroke, tumor, or disease, such as multiple sclerosis. It may also be the result of chronic alcoholism or overuse of certain medications.
The most common cause of tremors in the hands that decreases with use and increases in certain positions is essential tremor (ET), a condition that affects up to 5% of the population. It's thought to develop as a result of abnormal activity in a deep part of the brain, called the brain stem. In one-third of cases, it also affects the head or voice. In most cases, the tremor can be at least partially suppressed and it tends to resolve during sleep. Family members have a similar problem in at least one-half of all cases. There are other possible causes, however, so there are few other questions.