Hyperkinesia is a state of excessive restlessness which is featured in a large variety of disorders that affect the ability to control motor movement, such as Huntington's disease.
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Chorea is a continuous, random-appearing sequence of one or more discrete involuntary movements or movement fragments.
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Hyperkinesia, more specifically chorea, is the hallmark symptom of Huntington's disease, formerly referred to as Huntington’s chorea.