Inadequate myocardial blood supply to the heart mainly results in dyspnea, chest tightness, shortness of breath, and angina pectoris. During an angina attack, there may be a constricting sensation of pressure behind the sternum and back, and it may radiate to the left shoulder, left arm, little finger and ring finger. In case of insufficient blood supply to the heart muscle, nitroglycerin or musk heart pills should be taken promptly to relieve the symptoms quickly. The degree of coronary stenosis should be determined by coronary CT and coronary angiography, and whether coronary stenting or surgical open-heart bypass surgery is required. Both of these procedures can relieve the symptoms of myocardial ischemia.