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Diagnosis & Treatment. Essential tremor is a type of uncontrollable shake or tremble of part of the body. Most people with essential tremor experience a trembling, up-and-down movement of the hands. The arms, head, eyelids, lips and other muscles can also be affected. A tremor in the voice box (larynx) may cause a shaky voice.
Essential tremor is a disorder of the nervous system that causes a rhythmic shaking of a part of the body, most commonly hands. Essential tremor can also affect your head, voice, arms, or legs. Often the symptoms begin gradually.