The main symptoms of rib injury, i.e. rib fracture, include pain, infection, tissue damage within the thorax, and paradoxical respiratory movements. 1. Pain: Intercostal nerves are damaged due to rib fracture, resulting in localized pain and pressure pain, which is aggravated with coughing or deep breathing; if both sides of the thorax or anterior and posterior sides of the thorax are squeezed, the pain at the fracture site will be more pronounced, and bone friction sound can be heard sometimes. 2. Infection: Rib fracture combined with skin and soft tissue injuries may cause skin and soft tissue infections; or because of pain, patients dare not breathe hard and cough up sputum normally, the secretion is trapped in the respiratory tract, which is difficult to be discharged, blocking the corresponding trachea and bronchial tubes, resulting in lung atelectasis, and lung infection. 3. Thoracic tissue injury: If the broken end of the rib is displaced towards the inner side of the chest by external force, the pleura and lung tissue will not be protected by the rib, which will lead to injury, hemothorax, pneumothorax, or even subcutaneous emphysema or hemoptysis. If the displacement of the broken end of the fracture occurs later after the injury, the hemothorax or hemopneumothorax will be delayed accordingly. 4. Paradoxical respiratory movement: in the case of multiple rib fractures, the supporting role of ribs disappears, resulting in the collapse of the chest wall, the injured chest wall sinks inward during inhalation, and the injured chest wall protrudes outward when exhalation occurs, causing fluttering of the mediastinum, which seriously affects the normal ventilation of the lungs, resulting in severe oxygen deficiency and large amount of carbon dioxide retention, which can induce respiratory and circulatory failure in severe cases. When patients have rib injuries, they should go to regular hospitals for further examination in time in order to choose the appropriate treatment plan.