The bone in the middle of the chest is called the sternum, and the sternum protrudes: 1. congenital developmental abnormalities, such as chicken chest, barrel chest, which are generally more common in children, showing obvious deformities, and may affect breathing in severe cases. 2. congenital developmental abnormalities, with abnormal enlargement and hypertrophy of the sternum, and there may be local pain. If there is pain, recurrent inflammatory reaction, treatment may be needed, usually you can apply topical non-steroidal anti-inflammatory painkillers or ointments, such as Furtalin ointment, Nimesulide dispersible tablets, Cilazol capsules, etc., but it is not suitable for adolescents, that is, those within 18 years of age cannot take non-steroidal anti-inflammatory painkillers.