Rib pain in the lower part of the chest is caused by lesions of the rib nerves in the lower chest wall, the lungs and pleura, or the upper abdominal organs. Generally, analgesic treatment should be given on the basis of the treatment of the cause. 1. Lower chest wall costal nerve lesions: (1) Fractures of the ribs or tumors of the ribs in the lower chest can cause pain in the ribs at the lesion. (2) Costochondritis at the rib arch and intercostal neuritis in the lower chest can also cause pain in the affected ribs. 2. Lung and pleural lesions: lower lung infection, lung cancer invading the lower chest wall ribs, pleural mesothelioma or pleurisy stimulating the pleural nerve endings in the lower chest can cause rib pain in the lower chest. 3. lesions of upper abdominal organs: liver and gallbladder diseases, stomach and spleen diseases can cause rib pain under the right or left side of the chest. It is recommended to go to the hospital for further examination and diagnosis.