Hidden pain under the left rib cage, we should consider the following situations: first, insufficient blood supply to the heart, coronary heart disease patients in the activities or emotional stress, it is easy to appear such clinical manifestations, after rest or application of nitroglycerin can be effectively relieved, the examination of electrocardiogram and ultrasound of the heart will help to clarify the diagnosis. Second, lung disease, the most common such as pneumothorax, pulmonary embolism, lung inflammation, etc., these diseases can also appear subcostal pain, some patients are accompanied by coughing, coughing sputum, hemoptysis and other symptoms, check the chest CT will help to clarify the diagnosis. Third, mental and psychological factors, patients are prone to tension, anxiety, sleep deprivation, can also appear similar performance, encourage patients to exercise to improve sleep, if necessary, do psychological counseling, can help to improve such symptoms. Fourth, even if the left subcostal pain, we should pay attention to the ribs themselves with or without disease, such as localized contusion, crack fracture of the ribs and so on. Fifth, pay attention to diseases such as gastritis and gastric ulcer, which are usually associated with eating, and perform gastroscopy to help diagnose them.