Many people are alarmed when they get the result of “ST-T change” during the ECG examination, and many doctors tell them that they have “coronary heart disease”. Is this really the case? ST-T changes are not specific for diagnosis because there are many diseases and factors that affect ST-T changes. Commonly, these include: 1. technical reasons for the test, such as unstable ECG baseline and up and down drift. 2. 2, The effect of whistling and eating. 3, The effect of drugs such as digitalis. 4, electrolyte disorders, such as low blood potassium, low blood magnesium, etc. 5.Phytodysfunction, anxiety, depression. 6, cardiovascular diseases, such as hypertension, coronary artery disease, left ventricular hypertrophy, mitral valve prolapse, myocarditis, cardiomyopathy, etc. 7, neurological diseases, such as cerebrovascular accident, brain tumor, traumatic brain injury, central nervous system infection, etc. In addition, research shows that about 10-30% of normal people have ST-segment abnormalities, and about 15-20% have T-wave changes, especially in women, especially young and middle-aged women (especially before menopause) are more common. Therefore, ST-T changes in the ECG do not mean that the patient has coronary heart disease. However, if a patient has chest tightness, chest pain, combined with a variety of cardiovascular disease risk factors such as smoking, hypertension, diabetes, hyperlipidemia, obesity, etc., and has dynamic ST-T changes, when the doctor closely gives a clinical evaluation, ST-T changes are an important indicator for the diagnosis of angina pectoris and myocardial ischemia. In a word, don’t panic when you find ST-T changes, go to a regular hospital cardiology department and let a professional doctor judge it.