Coughing left chest lower rib pain may be related to chest muscle or nerve strain, rib injury, pneumothorax, pleurisy and so on. 1. Chest muscles or nerves are pulled: long-term chronic cough or sustained violent cough can cause muscle strain, when coughing, chest muscles or nerves are pulled and stimulated, thus causing pain symptoms. 2. Rib injury: If there is rib injury, such as fracture, etc., when coughing, the damaged ribs will be pulled, causing pain. 3. Pneumothorax: If pneumothorax occurs after coughing, symptoms such as chest tightness, chest pain, shortness of breath, breath-holding, etc. will occur, and the patient consciously coughs with pain in the ribs under the left chest. 4. Pleurisy: pleurisy is usually caused by infection, tumor, immunity, trauma and other factors, there may be fever, chest tightness, chest pain and other symptoms, coughing, exercise, deep breathing can cause the above symptoms to worsen. It is recommended that patients with coughing left chest lower rib pain go to the hospital in time, under the guidance of the doctor targeted treatment.