Whether mild ECG st-segment changes are important or not should be viewed in the context of the patient’s underlying etiology. Hypertension, vegetative nerve dysfunction, cardiomyopathy, myocardial ischemia and so on may occur ECG st-segment mild changes, to be analyzed in conjunction with the etiology of the disease, may not be of any significance, or the condition may be more serious. 1. Hypertension: patients with long-term poor blood pressure control, will occur in the left ventricular hypertrophy strain manifestations, ECG may be st segment mild changes, it does not matter. 2. Phytoneurologic dysfunction: in some of these patients, the ventricular rate is fast, and the ECG may have mild changes in the st-segment, and the ECG may be improved by performing a cardioplegia test and controlling the ventricular rate. It does not matter. 3. Cardiomyopathy: cardiomyopathy patients due to myocardial lesions, ECG vectors are affected, usually prone to mild changes in the st segment, which requires active treatment of the primary disease, some cardiomyopathies have a high chance of sudden death, this situation should be noted. 4. Myocardial ischemia: myocardial ischemia will occur st changes, combined with patients with chest tightness and chest pain and other typical symptoms, electrocardiogram such changes, need to be formalized in the cardiology examination, if the blood vessels are severely narrowed, may be life-threatening. Electrocardiogram st segment mild changes should be timely to the hospital, so as not to delay the condition.