There are no standardized rules on how often an ECG should be done, but it can be done if needed, and it is recommended that it be done at least once a year. ECG can detect many abnormalities and plays an important role in the diagnosis of diseases. Therefore, ECG can be performed according to the individual’s condition. An ECG is performed at least once a year to identify any abnormalities in the heart. By observing the electrical activity of the heart, ECG can find out whether the examinee has any arrhythmia, myocardial ischemia, etc. It can also assist in the diagnosis of myocardial ischemia and myocardial infarction, provide corresponding diagnostic bases for cardiac enlargement and myocardial hypertrophy, etc., and evaluate the effect of cardiac pacemakers. If you often have chest tightness and other discomforts, you should follow the doctor’s instructions to carry out ECG examination in a timely manner.