The swelling of the left side of the rib cage is not necessarily pancreatitis, but may also be due to rib cartilage trauma, intercostal neuralgia, pleurisy, etc. Due to the different causes and different treatment methods, it is recommended to consult a doctor in time to find out the cause of the problem and then give targeted treatment. 1. Rib cartilage trauma: trauma caused by impact or fall, resulting in capillary rupture and bleeding, blood exudation and inflammatory edema causing swelling inside the left rib cage. At this time, we should avoid strenuous exercise, pay attention to warmth, try to rest in bed, give local cold compresses and other methods to relieve the acute stage, and in serious cases, we should consult a doctor in time. 2. Intercostal neuralgia: due to herpes zoster or trauma caused by intercostal nerve stimulation, inflammatory reaction occurs, so that the left side of the ribs inside the swelling of the situation. It is also accompanied by pain and numbness of the skin, which can be treated with acyclovir tablets, niacin tablets, pregabalin tablets and other drugs as prescribed by the doctor. 3. Pleurisy: As the pleural tissue is stimulated by inflammation, the amount of water in the chest increases, thus causing swelling inside the left rib cage. Cefradin granules, prednisolone tablets, aspirin tablets and other medications can be prescribed. 4. Pancreatitis: Pancreatitis may also lead to swelling inside the left rib cage, if the diagnosis is clear, acid suppression, enzyme suppression, anti-infective treatment, such as omeprazole, octreotide, cefuroxime and so on. The above situation does not exclude other reasons, it is recommended to go to the hospital in time.