Cervical dystonia, also called spasmodic torticollis, is a painful condition in which the neck muscles contract involuntarily, causing your head to twist or turn to one side or tilt forward or backward.
Symptoms include muscle contractions forcing the chin towards the shoulder, straight up, or straight down, or the ear towards the shoulder. The most common type is when the chin is pulled towards the shoulder. Some people will experience a combination of these abnormal head gestures. Those with cervical dystonia will experience neck pain that can radiate into the shoulders as well as chronic headaches. This pain can be exhausting and disabling.
Cervical Dystonia. Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/cervical-dystonia/symptoms-causes/syc-20354123