1. After rib fracture, because the broken end of the fracture and soft tissue contusion will affect the intercostal nerve accompanying the rib, the intercostal nerve will be stimulated and radioactive pain will occur, and the fracture broken end of the back and forth activities will be more intense pain. 2. After rib fracture, local aseptic inflammation may occur, and this inflammatory stimulation will make the human body produce inflammatory factors and pain-causing factors, thus causing pain. Pain after rib fracture is a normal defense reaction of the human body, mainly due to the damage and stimulation of nerves, the human body releases inflammatory pain factor and so on. Therefore, stabbing pain or even severe pain will occur after rib fracture. You should go to the hospital in time for early and regular treatment.