It is possible to have an abnormal ECG when you are nervous. Due to the increased sympathetic excitability and increased secretion of catecholamines in the body during the process of nervousness, it can cause an increase in heart rate, increased myocardial contraction, and increased cardiac output resulting in an increased cardiac load. If the heart rate increases more than 100 beats per minute, the electrocardiogram may show abnormal tachycardia. If the patient has coronary artery disease, due to the increased heart rate and increased myocardial oxygen consumption, it may also induce an attack of myocardial ischemia, and the change of myocardial ischemia on the ECG. Therefore, before doing the ECG, let the patient rest for a period of time, relax and do not be nervous, and then perform the ECG examination in a calm state, so that the resting ECG of the actual condition can be obtained.