Prior to an attack some individuals experience tightening of muscles or other physical symptoms. Involuntary movements precipitate some attacks, and other attacks occur when the individual has consumed alcohol or caffeine, or is tired or stressed. Attacks can last from 10 seconds to over an hour. Some individuals have lingering muscle tightness after an attack. Paroxysmal choreoathetosis frequently begins in early adolescence. A gene associated with the disorder has been discovered. The same gene is also associated with epilepsy.
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