ECG st-t abnormalities are commonly seen in pathologic conditions, such as angina attack, acute myocardial infarction, and pericarditis, but a very small number are seen in normal people, such as in cases of prolonged exertion and mental stress. ECG st-t changes refer to changes in the ST segment and T wave on the ECG, which may be ST segment depression, elevation, or T wave inversion, flattening, or T wave hyperacuity. The more common st-t changes occur in organic heart disease, such as unstable angina, acute myocardial infarction, and pericarditis. During angina pectoris, it is more common to have a depressed st-segment and a flattened or inverted T-wave; during acute myocardial infarction, it is more common to have an elevated st-segment and a hyperacute T-wave; and during acute pericarditis, it is more common to have a bowed and downwardly elevated st-segment. These ECG changes are not absolute, because a disease-induced change in the st segment and T wave is a dynamic process of change. In a few cases, slight changes in ST-t can also occur in normal people, such as when staying up late for a long time, overworking, high mental stress, anxiety and tension, and the presence of organic heart disease is not found through perfect laboratory tests, and often no special treatment is needed. If the electrocardiogram shows ST-t abnormalities, it is recommended to go to the cardiovascular department of the hospital for standardized diagnosis and treatment.