The following reasons are common for pain inside ribs: First, rib fracture: rib fracture and dislocation can occur when the rib is directly hit, and it can puncture pleura and lungs to the deep side, which can cause hemothorax and pneumothorax, and even lead to serious respiratory difficulties and threaten the life, and the symptom can be relieved through early immobilization and reset. Secondly, respiratory diseases: bronchopneumonia or primary bronchopulmonary cancer can lead to the clinical symptoms of pain in the deep side of ribs, accompanied by cough, sputum, fever, etc., and even obvious systemic symptoms, such as emaciation, nausea, vomiting, and generalized fatigue. The lesion can be detected by CT scan or MRI, and early treatment can alleviate the clinical symptoms, while delayed treatment may lead to serious complications and affect the normal life of patients.