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Essential tremor (ET, also referred to as benign tremor, familial tremor, or idiopathic tremor) is the most common movement disorder; its cause is unknown.
Tremor is the uncontrollable shaking of a body part. Nearly everyone experiences tremor at some point, most often as a result of fear or excitement. However, persistent uncontrollable shaking is a common symptom of neurological disorders that destroy nerve tissue, such as Parkinsonâs disease or multiple sclerosis. Tremor may also occur after stroke or head injury. Other tremors appear without any underlying illness.