Pain under the left side of the rib cage can be seen in the following cases: 1. In patients with intercostal neuralgia or fasciitis or costochondritis, the pain is fixed at each site, the pain is prolonged, and the pain is accompanied by throbbing. This type of patients is a local problem, can be treated with local medication, if necessary with physical therapy methods, such as heat or infrared therapy. 2, seen in elderly patients, previous hypertension, diabetes, high blood lipids, angina attack will appear on the left side of the subcostal pain, accompanied by chest tightness, shortness of breath, anterior heart area pain, after rest or contain nitroglycerin, the symptoms can be After resting or taking nitroglycerin, the symptoms can be relieved. This type of patients should be especially careful, once the symptoms appear, it is recommended that patients go to the hospital for timely consultation, if necessary, coronary CT or coronary angiography for interventional treatment. 3, see patients with cardiac neurosis, this type of patients are mostly seen in the young population, there is no basis for the diagnosis of coronary heart disease, subjective symptoms are more obvious. Usually there is a left-sided subcostal throbbing pain, along with chest tightness, shortness of breath and other cardiac symptoms, which can be given psychological treatment and medication if necessary.