Protruding ribs in adults may be caused by fracture, costochondritis and developmental deformity of ribs. 1. Fracture: the rib may be fractured due to the patient’s collision, and the rib fracture may protrude out of the surface of the skin, and the phenomenon of protruding ribs in adults will occur. 2. Costochondritis: caused by infection of the rib cartilage or chronic strain, it will lead to the patient’s rib cartilage area appearing swollen and bulging, which looks like protruding ribs, and will also cause pain. 3. Developmental deformities of the ribs: may be due to certain congenital deformities or rickets and other causes of protruding ribs in childhood, after growing up, the ribs appear to protrude. When the patient has protruding ribs, it is recommended that the patient go to the hospital in time to improve the relevant examination and treatment according to the specific causes.