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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.
Key points about essential tremors. 1  ET is a neurological disorder that causes your hands, head, trunk, voice, or legs to shake rhythmically. The cause is not known, but it is often passed down from a parent to a child. 2  ET is sometimes confused with other types of tremor, so getting the right diagnosis is important.