ST elevation is defined as an ST segment on the ECG that is higher than the baseline level, and is commonly seen in normal subjects, early repolarization of the myocardium, and myocardial injury. Most normal ST segments are flush with the isoelectric line, and normal adults can have elevation of 0.2mv or higher in leads V1 to V3, with men having greater elevation than women. The rest of the leads are elevated by no more than 0.1mv. Early repolarization of myocardium can lead to upward elevation of ST-segment concave surface in some leads, mainly in leads V2~V5, II, III and AVF, and early repolarization is mostly a normal variant. Myocardial injury is mainly manifested by ST-segment elevation in the leads facing the injured myocardium, and when the subepicardial heart machine is injured, the ST-segment vector points to the epicardial leads, causing ST-segment elevation. If myocardial injury occurs, please go to the hospital for prompt consultation.