Huntington's disease (chorea) is characterized by abnormal movements and dementia. It is transmitted as an autosomal dominant trait. The age of onset is variable, but there is a tendency for the symptoms to begin at about the same age in affected members of a family. Haloperidol is commonly used to treat the chorea; there is no treatment for the dementia. Recent research has suggested abnormalities in tissue levels of gamma-aminobutyric acid. Treatment is supportive and should be provided by the family physician.