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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 (ET) is one of the most common neurological conditions and the most common cause of tremor. Tremor is an involuntary, rhyth-mic shaking of any part of the body. The hands are most commonly affected in ET, but the head, voice, legs, and trunk can also be affected.The term essential, when used in a medical context, refers to a symptom that is isolated and does not have a specific underlying cause.