Abnormal limb or trunk posture

Dystonia is a type of involuntary movement. It is a group of symptoms caused by repeated involuntary movements and abnormal positions of the body caused by the uncoordinated and intermittent continuous contraction of the synergistic muscles and antagonist muscles of the body's skeletal muscles. Also known as Dystonia Syndrome. It can be caused by central nervous system dysfunction (such as basal nucleus lesions) or unknown cause. The former is called secondary dystonia and the latter is called primary dystonia. Dystonia is characterized by abnormal postures of the limbs or torso, which can affect movement or cause distortion, odd asynchrony.