Chorea is characterized by brief, semi-directed, irregular movements that are not repetitive or rhythmic, but appear to flow from one muscle to the next. These 'dance-like' movements of chorea often occur with athetosis, which adds twisting and writhing movements. Walking may become difficult, and include odd postures and leg movements. Unlike ataxia, which affects the quality of voluntary movements, or Parkinsonism, which is a hindrance of voluntary movements, the movements of chorea and ballism occur on their own, without conscious effort. Thus, chorea is said to be a hyperkinetic movement disorder. When chorea is serious, slight movements will become thrashing motions; this form of severe chorea is referred to as ballism, or ballismus.
symptom of Lesch–Nyhan syndrome
symptom of Tay–Sachs disease
symptom of Maroteaux–Lamy syndrome
symptom of Myotonic dystrophy
symptom of Bannayan–Riley–Ruvalcaba syndrome
symptom of Fragile X syndrome
symptom of Neurofibromatosis
symptom of Rotor syndrome