The causes of insufficient blood supply to the heart in young people are clinically divided into the following categories of diseases: 1. Coronary atherosclerosis. Although the chances of coronary atherosclerosis occurring in young people are relatively low, with the current changes in lifestyle and increased life stress, there are few young patients with coronary heart disease, angina pectoris and myocardial infarction. Therefore, for patients with typical angina symptoms and electrocardiogram suggesting cardiac ischemia, coronary CT or coronary angiography is needed to clarify whether the combination of coronary heart disease.2. Myocarditis. If the patient has a recent history of cold, after the cold, there is panic, chest tightness, breathlessness and other discomfort, and the electrocardiogram has T-wave changes or ST-segment depression, it is recommended that the patient do cardiac ultrasound, as well as check myocardial enzymology, troponin I, to clarify whether it is combined with myocardial injury. Therefore, patients with myocarditis can also have insufficient myocardial blood supply.3. Anemia. Patients with hypotension can have inadequate coronary artery blood supply, resulting in T-wave inversion or ST-segment depression on the ECG. 4. Young patients without any underlying disease, however, have frequent worries, anxiety, recurrent episodes of panic, chest tightness, dizziness, and general malaise. For this type of patients, it is possible that the T-wave change is caused by mental emotion, so no medication can be given.