Poison Sumac. Poison sumac, Toxicodendron vernix, is related to the poison ivies and poison oaks, not to the other sumacs. It is relatively rare, compared to the other members of the family. The rash-causing agent, urushiol, is the same, and it causes the same rashes.
Most symptoms relate to movement of the face and hands, although some variants on this disorder have different symptoms. Almost always, tardive dyskinesia symptoms involve involuntary movements of some kind. In variants of tardive dyskinesia, a person may feel driven to move but may be able to control movement for a while. Usually, tardive dyskinesia symptoms include mouth and hand movements, although the limbs may move as well. Making faces, such as grimacing or puckering the lips, is common. One distinctive movement is the constant chewing associated with this disorder. The tongue may also protrude or move in unusual ways.
Many patients with adductor type spasmodic dysphonia complain of physical fatigue, tightness of the neck, back, and shoulder muscles and shortness of breath due to their efforts to phonate through the closed glottis. The severity of the symptoms of adductor spasmodic dysphonia varies within and among individuals.