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Some patients have been found to have both essential tremors and resting tremors. While essential tremor is distinct from Parkinson's disease, which causes a resting tremor, essential tremor is nevertheless sometimes misdiagnosed as Parkinson's disease. Diagnosis is by observing the typical pattern of the tremor coupled with the exclusion of known causes of such a tremor. Its onset is usually after age 40, but it can occur at any age.

Įssential tremor is a progressive neurological disorder, and the most common movement disorder. This means that it is distinct from a resting tremor, such as that caused by Parkinson's disease, which is not correlated with movement. Essential tremor is either an action (intention) tremor-it intensifies when one tries to use the affected muscles during voluntary movements such as eating and writing-or it is a postural tremor, present with sustained muscle tone. It is typically symmetrical, and affects the arms, hands, or fingers but sometimes involves the head, vocal cords, or other body parts.

The spiral on the left was drawn by the subject using the left hand, and the one on the right using the right hand.įamily history, exposure to particular toxins Ĭerebellar tremor, dystonic tremor, multiple sclerosis, Parkinson's disease īeta blockers, primidone, anti-epileptics, topiramate, gabapentin, levetiracetam, benzodiazepines Īnnual incidence of 23.7 per 100,000 (2010) Įssential tremor ( ET), also called benign tremor, familial tremor, and idiopathic tremor, is a medical condition characterized by involuntary rhythmic contractions and relaxations ( oscillations or twitching movements) of certain muscle groups in one or more body parts of unknown cause. Archimedean spiral drawings from a man with a unilateral essential tremor.

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