Pain below the left rib cage is commonly caused by the following: first, hypersplenism and spleen injury can lead to pain below the left rib cage, accompanied by abdominal muscle tension. In severe cases, spleen rupture occurs, which can lead to peritonitis, and the patient will have severe pain and a plate-like abdomen, and the site of the lesion can be found through ultrasound examination. Secondly, injury to the left rib muscle can also lead to pain below the left rib cage with respiratory distress. After timely cold compress treatment and braking treatment, the clinical symptoms can be quickly relieved. Third, digestive system dysfunction, such as intestinal flatulence, can also lead to pain below the left rib cage, accompanied by exhaustion and defecation disorders, and patients may experience clinical symptoms such as constipation. Pain below the left rib cage must be diagnosed and treated early in order to get satisfactory relief of clinical symptoms.