Pain in the left upper abdomen near the rib cage can be caused by the following diseases: First, patients with pleurisy will have pain in the quarter rib area, also accompanied by restricted deep breathing, as well as coughing and coughing, and also fever, which can be confirmed by chest radiography, mainly secondary to lung tissue infection, and should be treated systematically with anti-infection therapy, and the symptoms can gradually improve. Secondly, diseases occurring in the abdominal cavity, commonly known as gastric disease, gastric ulcer, the patient will show pain in the left upper abdomen, acid reflux, belching, especially after eating will lead to the aggravation of symptoms, after giving drugs to inhibit gastric acid, drugs to protect the gastric mucosa, commonly used omeprazole, the patient’s pain symptoms can also gradually improve. It is also important to pay attention to diet, not to overeat, to do sports and exercise properly, and to have regular gastroscopy.