The following conditions should be considered: First, insufficient blood supply to the heart. Patients with coronary artery disease are prone to such clinical manifestations when they are active or emotionally agitated, which can be effectively relieved by resting or applying nitroglycerin. Second, lung diseases, the most common ones such as pneumothorax, pulmonary embolism, inflammation of the lungs, etc., these diseases can also appear with vague pain under the ribs, and some patients also have cough, coughing sputum, hemoptysis and other symptoms, examination of chest CT can help clarify the diagnosis. Third, psychosomatic factors, patients are prone to tension, anxiety, lack of sleep, can also appear similar performance, encourage patients to exercise to improve sleep, if necessary, do psychological guidance, help improve such symptoms. Fourth, even if the pain is under the left rib cage, it is important to pay attention to any diseases in the rib cage itself, such as local contusions, crack fractures of the rib cage, etc. Fifth, pay attention to diseases such as gastritis and gastric ulcer. Such diseases are usually associated with eating and a gastroscopy can help diagnose them.