What is cervical dystonia? Cervical dystonia is a condition that causes the muscles in your neck to tighten or spasm without your control. With cervical dystonia, your head may turn in an unusual way, or it may be forced into an abnormal, uncomfortable position. This condition can be painful and challenging. Causes and signs of cervical dystonia It is unknown what exactly causes the muscle contractions associated with cervical dystonia. Some cases appear to be linked to head,