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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.
Definite essential tremor is postural tremors in the arms that increase during action in the absence of any condition or drug known to cause enhanced physiologic tremor and in the absence of cerebellar symptoms and signs, and in the absence of Parkinson's disease and dystonia.efinite essential tremor is postural tremors in the arms that increase during action in the absence of any condition or drug known to cause enhanced physiologic tremor and in the absence of cerebellar symptoms and signs, and in the absence of Parkinson's disease and dystonia.