Myocardial ischemia is generally caused by tachycardia, increased myocardial oxygen consumption and other reasons, mostly related to obesity, long-term smoking, drinking and other factors, the symptoms are generally divided into typical symptoms and accompanying symptoms. 1. Typical symptoms: the most typical symptoms of this disease are discomfort and pain in the precordial area, which mostly occur during exercise and can be relieved by themselves after the exercise stops. The discomfort in the precordial area is mainly manifested as a sense of constriction and stuffiness, and the pain is usually crushing pain. 2. Accompanying symptoms: long-term myocardial ischemia patients will also appear arrhythmia, cardiac insufficiency and other symptoms, arrhythmia is mainly manifested as chest tightness, palpitations, etc., and some patients will also be accompanied by dizziness, generalized fatigue, fainting, etc., heart failure is mainly manifested as shortness of breath, dyspnea, coughing, generalized edema, etc., and some patients will also have fever, shock and other symptoms. If the above symptoms occur, should promptly go to the hospital for medical treatment, after diagnosis under the guidance of the doctor for treatment, the patient should regularly go to the hospital for re-examination, the doctor can adjust the treatment program according to the situation of the re-examination.