Rib fractures are generally caused by trauma, resulting in localized pain and restricted respiratory movements. In severe cases, there may be blood or fluid accumulation inside the chest cavity, or even respiratory distress, presenting symptoms similar to flail chest. Therefore, when a rib fracture occurs, the pain is very severe because the ribs are an important part of the thoracic cage, which is a crucial structure during respiratory movements. Thus, during breathing, the pain from a rib fracture can be quite intense.