Myocardial ischemia requires physical examination, laboratory tests, imaging tests, electrocardiogram and so on. 1. Physical examination: myocardial ischemia examination may show an increase in heart size. 2. Laboratory examination: abnormal elevation of cardiac enzymes and troponin suggests possible myocardial infarction. 3. Imaging examination: cardiac ultrasound can be used to determine whether the heart is enlarged, whether the myocardium is hypertrophied, heart valves, etc. In the presence of myocardial infarction, the ultrasound can show abnormal segmental movement of the heart at the infarction site. Coronary CT angiography, can clarify the existence of coronary artery stenosis. 4. Electrocardiogram: including 12-lead electrocardiogram, 18-lead electrocardiogram, and dynamic electrocardiogram, which can be used to determine whether there is myocardial ischemia. Patients who suspect myocardial ischemia can go to the hospital and under the guidance of the doctor, choose the appropriate examination method for the examination according to the condition.