Dystonia
![](/Images/godic/202412/17/Dystonia20101259.JPG")
![Hyperglycemia-induced involuntary movements, which, in this case, did not consist of typical hemiballismus but rather of hemichorea (dance-like movements of one side of the body; initial movements of the right arm in the video) and bilateral dystonia (slow muscle contraction in legs, chest, and right arm) in a 62-year-old Japanese woman with type 1 diabetes.](/Images/godic/202412/17/-Hemichorea_and_dystonia.ogv1259.jpg")
Dystonia is a neurological movement disorder in which sustained muscle contractions cause twisting and repetitive movements or abnormal postures. The movements may resemble a tremor. Dystonia is often initiated or worsened by voluntary movements, and symptoms may "overflow" into adjacent muscles.