ST-T changes, usually referred to as cardiac ST-T changes, are clinical changes reflected in ECG vectorcopy and are usually caused by insufficient blood supply to the patient’s myocardium. Cardiac ST-T changes may appear as ST-segment elevation on the ECG, which suggests that the patient may have an acute myocardial infarction. Cardiac ST-T changes may also be manifested as low ST segments and inverted T waves in the ECG results, which suggests that the patient may be suffering from myocardial ischemia or coronary artery stenosis, etc. However, it should be noted that cardiac ST-T changes are caused by insufficient blood supply to the myocardium. However, it should be noted that cardiac ST-T changes are only an indicator in the clinical electrocardiogram, and cannot directly determine that the patient is suffering from a certain disease. In order to clarify the specific conditions, it is recommended that the patient go to the Department of Cardiovascular Medicine of the regular hospital in a timely manner for coronary artery angiography, nuclear myocardial imaging, and other comprehensive examinations.