Huntington's disease is the most common cause of choreic abasia. The neurodegenerative disease also causes changes in behavior and progressive cognitive impairment. Some other genetic conditions can cause choreic abasia, as well, such as Friedrich's ataxia and Rett syndrome, although these are very rare. Choreic abasia can also occur as the result of an acquired illness. Cerebrovascular disease, HIV, and rheumatic fever can all lead to chorea in the legs. Occasionally, choreic abasia can develop during pregnancy, which experts classify as chorea gravidarum. The acquired condition sometimes resolves before the baby is born. If not, it usually goes away on its own a few days after delivery.
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