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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 thought to be caused by electrical fluctuations in the brain that send abnormal signals out to the muscles. Several areas of the brain have been implicated in generating these abnormal signals. The signals travel through a variety of brain regions before they make it out to muscles.