May be occasional (sporadic), temporary (episodic) or occurring at intervals (intermittent)
May affect the head, hands, arms, eyelids, or other muscles
May not affect both sides of the body equally
A shaking or quivering sound to voice
Tremors that worsen with voluntary movement or emotional stress
Tremors that disappear during sleep
Signs and tests
Tests depend on the suspected cause of the tremor. However, a neurologic examination should be conducted in most cases.
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Definition Essential tremor is a type of involuntary shaking movement in which no cause can be identified. Involuntary means you shake without trying to do so. See also: Drug-induced tremor Tremor Alternative Names Tremor - essential; Familial tremor; Tremor - familial Causes, incidence, and risk factors Essential tremor is the most common type of tremor. Everyone has some tremor present, but the movements are often so small that they can't be seen. Essential tremors are most common in people older than 65. The exact cause for essential tremor is unknown. Tremors occur when there is a problem with the nerves that supply certain muscles. Some research suggests that the part of the brain that controls muscles movements does not work correctly in patients with essential tremor. Essential tremor can also occur with other brain and nervous system problems, such as dystonia, parkinsonism, and certain nerve conditions passed down through families. If an essential tremor occurs in more than one member o...
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