The cause of the bulbous protrusion of the xiphoid process is considered to be related to factors such as xiphoid hyperplasia, local trauma, and so on. 1. raphe hyperplasia: the raphe is mainly located in the lowest bone structure of the sternum, generally will always be in cartilage and semi-osteolysis state, if suddenly appeared round ball protrusion, can not be ruled out and the raphe hyperplasia factors related to the cartilage, ligament and other tissues constituting the joints, and degeneration of the degeneration of the degeneration of the tissue, and then bone destruction, caused by the secondary hyperplasia and raphe deformity. 2. Local trauma: the cause of the bulge of the raphe is not excluded due to the deformity of the raphe, especially for patients who have suffered local trauma, it will increase the possibility of the deformity of the raphe. It is recommended that the patient can go to the orthopedic department of the hospital, cooperate with the doctor to clarify the specific causes, and then do the corresponding treatment and therapy.