The number of sub-healthy people is growing, and many people come to the hospital for checkups, regardless of whether they are sick or not, and many patients start to panic that they are suffering from heart disease when they find abnormal ECG after checking the ECG, but in fact, some abnormal ECG is not necessarily heart disease and needs to be diagnosed and identified by a cardiologist in clinical practice. In fact, in addition to heart disease, other non-cardiac factors can also lead to ST-segment and T-wave changes in the ECG, which may be seen in: (a) pulmonary embolism (b) cerebrovascular accidents: ST-segment elevation can occur (c) abdominal diseases: such as gallbladder or pancreatic diseases (d) early repolarization syndrome (e) blood electrolyte disorders: changes in blood potassium, sodium and calcium (f) phytoconstituent disorders Clinically, the most common “abnormal” ECG is “sinus arrhythmia”, “sinus tachycardia” and “ST-segment changes”. changes”. The term “sinus” is not a pathology, as all normal people have “sinus rhythm”. In fact, most people have more or less irregular heart rhythms, most of which are related to the respiratory rhythm, which is normal; and “sinus tachycardia”, which most often occurs in people with fever. in feverish people. In fact, it is a normal reaction of the body to have a faster heartbeat when you have a fever. Generally, the heartbeat can increase 15-20 times for each degree of temperature increase. In addition, sinus tachycardia can also occur after emotional excitement, stress and exercise; the “ST segment” on the electrocardiogram is one of the bases for diagnosing myocardial ischemia, such as “ST segment decline”, indicating insufficient blood supply to the heart muscle, often suggesting the possibility of coronary heart disease. However, some conditions, such as patients with vegetative dysfunction, may also cause ST-segment drop. Therefore, only those with dynamic ST-segment changes or when accompanied by other symptoms such as angina pectoris are diagnostic. If a patient has ST-segment or T-wave changes on the ECG, special attention should be paid to whether the changes are persistent or dynamic (transient). If they persist, most of them are not due to myocardial ischemia or coronary artery disease; if the ST-segment (T-wave) changes are associated with chest pain, then it is most likely to be unstable angina or myocardial infarction. For highly suspicious or high-risk patients, coronary angiography should be performed if necessary. In short, the heart is susceptible to neurological, psychiatric and endocrine system effects. Therefore, an abnormal ECG does not necessarily mean that the heart is sick. Generally speaking, if you have been very healthy and your heart examination has been normal, and there is some abnormality in the ECG by chance, and there is no discomfort, it may be related to your own tension or environmental factors, and there is no big problem, so we suggest that you should not worry too much, make some self-adjustment, take proper rest, and recheck the ECG on another day, and pay attention to the follow-up if there is any corresponding discomfort.