Myocardial ischemia usually occurs on the basis of coronary artery atherosclerosis, when part of myocardial ischemia will cause ST-T changes (ST-segment elevation, depression, T-wave hyperacusis, hypoacusis, inversion, etc.) in the corresponding leads of the ischemic area, so ST-T changes are usually used as an important reference indicator for myocardial ischemia, angina pectoris and myocardial infarction in the diagnosis process. -T changes are not equal to coronary heart disease. ST-T changes are not diagnostic specific, that is, they are not specific to any one disease, but are a response to a change in the electrical activity of the heart, and there are many reasons for such changes. Normal conditions: ST-T changes can occur in healthy people, that is, congenital, and ST-segment abnormalities account for about 10-30% of normal people, and T-wave changes account for about 15-20%, especially in women, especially young and middle-aged women. Other conditions: 1, examination errors, such as electrocardiographic baseline instability; 2, drug effects such as digitalis, quinidine, amiodarone, tricyclics, phenothiazine antidepressants; 3, electrolyte effects, such as low blood potassium, high blood potassium, calcium ion, magnesium ion abnormalities; 4, phytokinetic disorders, cardiac neurosis, mental and psychological state of depression and anxiety; 5, cardiovascular disease, such as hypertension, coronary artery disease, left ventricular hypertrophy. coronary artery disease, left ventricular hypertrophy, bundle branch conduction block, pre-excitation syndrome, early repolarization, myocarditis, cardiomyopathy, valvular disease, mitral valve prolapse, pericarditis, pericardial effusion, etc. can cause secondary ST-T changes; 6, neurological diseases, such as cerebral hemorrhage, cerebral infarction, brain tumor, traumatic brain injury, central nervous system infection; 7, endocrine diseases: hyperthyroidism, hypothyroidism pheochromocytoma; 8, other: severe anemia, severe thoracic deformity, funnel chest, full meal, hyperventilation, change of body position, etc. From the above list, it can be seen that there are many reasons for ST-T changes, not a single coronary heart disease (coronary atherosclerotic heart), so when the electrocardiogram appears ST-T changes absolutely can not be hastily diagnosed as heart disease, need to integrate the patient’s age, gender, lifestyle habits, other combined diseases, symptoms are not good to consider, but also need to further identify with the help of other auxiliary tests. After understanding the above, when your ECG shows ST-T changes, you should not think that you must be suffering from coronary heart disease, but should listen carefully to the doctor’s opinion to avoid unnecessary mental burden.