Chorea is a common hyperkinetic movement disorder that can have a large differential diagnosis. Causes can include genetic and sporadic etiologies, including metabolic abnormalities, autoimmune, structural, paraneoplastic, psychogenic, and iatrogenic causes. The workup can be challenging due to this large number of possible causes, and can include basic metabolic and specialized blood analysis such as genetic testing, in addition to imaging studies and cerebrospinal fluid analysis. Treatment of symptoms outside the realm of reversible causes can be challenging, and is a major focus of current research. This review covers sporadic causes, genetic causes, and management. Figures show a flowchart for evaluation of patients with chorea, a computed tomography scan of a Huntington disease patient showing caudate head atrophy, brain computed tomography scan showing calcification, and acanthocytosis. Videos show mild and moderate Huntington disease, Huntington disease-like 2, and chorea-acanthocytosis. Tables list metabolic abnormalities that can manifest as chorea, paraneoplastic and nonparaneoplastic syndromes associated with chorea, and reported successful therapies for chorea. This re
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