Please help! What is the difference between ataxia and dyskinesia?

Ataxia/dyskinesia. Ataxia is a lack of voluntary coordinated muscle movements due to dysfunction of the cerebellum in the brain. In contrast, dyskinesia is defined as involuntary muscle movements from medications (e.g. anti-psychotic drugs) or degeneration of neurons in the brain stem (e.g. Parkinson's disease.