Dyskinesia refers to involuntary movements, similar to a tic or chorea. Dyskinesia is a symptom of several meical disorders and is distinguished by the underlying cause. When a dyskinesia presents after treatment with an antipsychotic drug such as haloperidol, it is a tardive dyskinesia and is commonly found in face as tongue "rolling". A dyskinesia found in a patient with Parkinson's disease is more commonly a jerky, dance-like movement of the arms or head and usually presents after several years of treatment with medication containing L-dopa.