Heart discomfort is divided into many kinds of conditions, and common diseases include arrhythmia, myocardial ischemia, coronary artery disease, cardiomyopathy, etc. The most serious ones can also be heart failure. If you feel uncomfortable with your heart only at night when you sleep, you should pay high attention to distinguish whether it is coronary heart disease or cardiac insufficiency. First of all, we should distinguish whether it is panic, chest tightness, chest pain, or feeling uncomfortable symptoms such as heart steal stop, etc. The related examinations that need to be perfected include ECG and if necessary, 24-hour ambulatory ECG monitoring to see the heart rate and blood supply of the heart; we should also do cardiac color ultrasound to understand the size of each atrium, heart ejection fraction and basic structural changes; if it is a serious case, we should also do cardiac CT or coronary artery angiography to clarify the specific vascular condition of the heart.