There are a few cases of angina pectoris in which the ECG is normal. Angina pectoris refers to the phenomenon of severe coronary artery stenosis leading to myocardial ischemia and hypoxia causing pain in the retrosternal or precordial region, and during acute attacks of angina pectoris, the electrocardiogram shows obvious ST segment downshift or T wave inversion, which is known as myocardial ischemia electrocardiogram changes in the medical field. There are also a small number of patients with angina pectoris, the electrocardiogram appears similar to the normal electrocardiogram changes, but this patient angina pectoris relief after re-examination of the electrocardiogram, on the contrary, the electrocardiogram ST-segment downward shift or T-wave inversion and other myocardial ischemia changes, the medical term for the electrocardiogram of the pseudo-normalization. Therefore, angina attack electrocardiogram by a professional doctor combined with the patient’s condition to determine whether there is an abnormality, the treatment should also be used under the guidance of the doctor.