Left lower rib pain is usually caused by left lower chest wall lesions such as costochondritis, intercostal neuritis, rib fracture and other diseases, but also common in lung disease, left upper abdominal lesions, urinary tract diseases and other causes of referred pain. 1. Left lower chest wall lesions: such as costochondritis, intercostal neuritis, rib fracture, rib tumor and other neuroinflammation and rib lesions can cause pain in the lower left rib. 2. Lung diseases: left lower lung infection, pleurisy, left lower lung cancer and other lung diseases can cause left lower rib pain. 3. Left upper abdominal diseases such as gastritis, gastric ulcer, pancreatitis, splenomegaly and other diseases can also cause pain in the lower left rib. 4. Left-sided urinary diseases such as nephritis, kidney stones, ureteral stones and other diseases can also cause pain involving the lower back of the left rib. It is recommended to go to the hospital for further counseling or treatment for pain in the lower left rib.