Pain and protrusion of the bone in the middle of the chest is mainly caused by costochondritis. Costal chondritis is a non-bacterial inflammatory disease caused by straining, heavy physical labor, or injury to the rib cartilage. The clinical manifestations are localized painful elevation of the sternum and rib junction and localized pain on pressure, which can be seen without any abnormalities on X-ray. The main treatment is to avoid heavy physical labor and strenuous activities, pay attention to rest, especially to avoid pulling movements and strenuous activities of the chest, and to apply local Fotarin ointment or topical creams for symptomatic treatment, and also to choose hot compresses and physical therapy. If the pain is very serious, you can take oral diclofenac sodium enteric dissolve tablets or anti-inflammatory and analgesic drugs such as etoricoxib and Xilab for relief.