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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 an involuntary, rhythmic muscle contraction leading to shaking movements in one or more parts of the body. It is a common movement disorder that most often affects the hands but can also occur in the arms, head, vocal cords, torso, and legs.