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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.
Summary. 1  Essential tremor is a neurological (nervous system) disorder characterised by the involuntary shaking or trembling of particular parts of the body, usually the head and hands. 2  The tremors typically worsen when the hands are being used (kinetic tremor), and reduce significantly or stop altogether when the hands are resting.