A protruding bone at the very bottom of the rib cage is normal if it is just the raphe bone. However, if the bone is painful and accompanied by other adverse reactions, it is considered abnormal. Under normal circumstances there is a protruding bone underneath the human ribcage, which is the raphe, and has the role of protecting the heart. If there is no obvious pain when touching the bone, and there is no accompanying other normal reactions, then it is considered to be normal, and there is no need to do special treatment. However, if the bone protruding below the rib cage has obvious pain when pressed, and is accompanied by chest tightness, coughing, dyspnea and other symptoms, generally does not belong to the rapier bone, may be costochondritis, rib tumors, leukemia, etc., which are not normal, and need to be targeted treatment. If you suspect that the bone protruding below the ribs is abnormal or malignant lesions, you need to consult the doctor and diagnose and analyze through chest radiographs, CT, and puncture biopsy to understand the cause of the disease and then target treatment.