The common clinical reasons for the protrusion of the subcostal ribs are mainly the following: first, patients with advanced tumor are in a state of extreme energy deficiency, the muscles of the chest can be completely consumed, which is manifested by the obvious protrusion of the subcostal ribs, the prognosis of patients at this time is extremely poor, and the overall survival time is generally about three months; second, adolescent patients will have calcium deficiency in their bodies due to insufficient calcium supplementation, resulting in developmental deformities. For the protrusion of the ribs under the chest, we can promote the normal development of the patient’s body by actively supplementing calcium and eating more milk, eggs, fish and lean meat, and if the protruding ribs obviously affect normal life, surgery can be considered; third, patients with chronic obstructive pulmonary disease can have protruding ribs due to prolonged coughing and lung infection, which often does not affect the patient’s normal life. On the contrary, it is necessary to control the patient’s lung infection to avoid respiratory failure.