The sternocleidomastoid muscle is a muscle located in the neck, mainly on both sides of the body’s neck, at the upper edge of the clavicle. The sternocleidomastoid muscle is also attached to the end of the body’s sternum. The function of the sternocleidomastoid muscle is mainly to help the body maintain normal head movement. In a normal body, the sternocleidomastoid muscle is attached to the upper collar line and mastoid process at its upper end and to the proximal end of the clavicle at its distal end. On both sides of the sternocleidomastoid muscle, crossed by the common carotid artery, the sternocleidomastoid muscle can maintain the stability of the cervical spine area. When the neck often weight-bearing activities patients catch cold patients, it is easy to appear sternocleidomastoid muscle strain, easy to cause patients to appear neck pain, limited activities and other diseases. When the patient’s sternocleidomastoid muscle discomfort, should promptly go to the hospital for examination and treatment.