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essential tremor
Essential tremor (ET, also referred to as benign tremor or familial tremor) is the most common movement disorder; its cause is unknown. It typically involves a tremor of the arms, hands or fingers but sometimes involving the head, vocal cords or other body parts during voluntary movements such as eating and writing.
It is distinct from Parkinson's disease—and often misdiagnosed as such—although some individuals have both conditions.〔 Essential tremor is commonly described as an action tremor (it intensifies when one tries to use the affected muscles) or postural tremor (present with sustained muscle tone) rather than a resting tremor, such as is seen in Parkinson’s, which is usually not included among its symptoms.〔(【引用サイトリンク】title=LINGO1 variant responsible for essential tremors and Parkinson's disease )〕
== Classification ==
This type of tremor is often referred to as "kinetic tremor".
Essential tremor has been known as "benign essential tremor", but the adjective "benign" has been removed in recognition of the sometimes disabling nature of the disorder.〔〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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