The sternal raphe is a small bony protuberance at the bottom of the human sternum, the smallest structure in the entire sternum, and the most variable structure in the sternum. In adolescence, the sternal raphe belongs to the cartilage structure, and most of the adolescents’ sternal raphe is in the state of protruding, which is a normal phenomenon. This is because when adolescents are in the growth and development period, both the rib cartilage and the raphe cartilage are not yet fully developed. With the gradual completion of growth and development, the rib cartilage is gradually formed, and the raphe cartilage gradually undergoes partial ossification, and the body shape, subcutaneous fat, and chest muscles gradually develop completely, then the symptoms of sternal raphe protrusion may disappear. If the phenomenon of protruding sternocleidomastoid protrusion occurs in adults, it is mostly seen in people with thin physique and people who work a lot, and the protrusion of the sternocleidomastoid protrusion will be more obvious, or it is often stimulated by external force and caused to be protruding, and if there is no uncomfortable symptom in normal times, it usually does not need to be corrected and treated.