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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.
Back to TopCauses. Essential tremor is the most common type of tremor. Everyone has some tremor present, but the movements are often so small that they cannot be seen. Essential tremor affects men and women and is most common in people older than 65. The exact cause of essential tremor is unknown. Some research suggests that the part of the brain that controls muscle movements does not work correctly in patients with essential tremor.