Typical symptoms of myocardial ischemia are chest pain, chest tightness, a few patients may show sore throat, toothache, etc., and some patients may not have any performance. Myocardial ischemia will lead to insufficient myocardial perfusion, typical symptoms of myocardial ischemia is chest pain, can be accompanied by chest tightness, chest pain site and sternum just below the middle, the pain can be radiated to the left upper limb, can be accompanied by sweating, the pain is mostly manifested as boring pain or squeezing pain, the symptom can be relieved after taking nitroglycerin. The symptoms of angina pectoris in a few patients are atypical, and may be manifested as sore throat, toothache and other symptoms. Some patients with myocardial ischemia may not have any manifestations, showing asymptomatic ischemia. Patients with myocardial ischemia should pay attention to find the triggering cause of the symptoms can be given to expand the coronary arteries of drug therapy, such as isosorbide nitrate, there is a clear cause of the disease to treat the primary disease.