There are still many different opinions, most of which believe that the fetal malposition or abnormal pressure on the uterine wall obstructs the blood circulation of the sternocleidomastoid muscle due to abnormal posture of the head and neck, resulting in ischemia, atrophy, dysplasia, and contracture of the muscle, causing the oblique neck. It is also believed that the sternocleidomastoid muscle is injured and bleeding due to extrusion or traction by the birth canal or forceps during childbirth, and the hematoma is caused by mechanized contracture. It is also believed that the sternocleidomastoid muscle has degenerative changes due to embolism of the nutrient artery or obstruction of venous return, resulting in the formation of a squinty neck. Adult congenital oblique neck is mainly a series of symptoms caused by the lack of timely or thorough treatment of the muscularity in children.