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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.
Essential tremor is a nerve disorder in which tremors occur without an identifiable cause. The tremor resembles an exaggerated shaking and occurs when a person is using his or her hands but does not occur while the hands are at rest. Parkinsonâs tremors are just the opposite â noticeable shaking when at rest but no shaking when the hands are engaged.