choreoathetosis choreoathetosis choreoathetosis is the occurrence of involuntary movements in a combination of chorea (irregular migrating contractions) and athetosis (twisting and writhing). choreoathetosisspecialtyneurology it is caused by many different diseases and agents. it is a symptom of several diseases, including lesch–nyhan syndrome, phenylketonuria, and huntington disease and can be a feature of kernicterus (rapidly increasing unconjugated bilirubin that cross the blood-brain-barrier in infants). choreoathetosis is also a common presentation of dyskinesia as a side effect of levodopa-carbidopa in the treatment of parkinson disease. the use of crack cocaine or amphetamines can result in conditions nicknamed crack dancing, or tweaking respectively, described as choreathetoid.