Clinically there is no such thing as mild coronary artery disease, generally asymptomatic coronary artery disease is called insidious coronary artery disease, this phenotype of coronary artery disease may not have any symptoms, but there may be chest discomfort, chest tightness and so on. Currently, coronary heart disease is divided into chronic coronary artery disease including stable angina, ischemic cardiomyopathy and occult coronary heart disease and acute coronary syndrome including unstable angina and myocardial infarction mainly based on the characteristics of the onset of the disease and the principle of treatment. Insidious coronary artery disease usually refers to the clinical observation of angina and other symptoms or may be present for a short period of time in the chest abnormal sensations, such as chest discomfort, chest tightness, etc., but most of the cases of daily activities can be tolerated, especially patients taking pain medication on weekdays, there is no myocardial ischemia of the clinical symptoms and there is no obvious clinical evidence suggesting that the lesion. If the clinical discomfort is more obvious, it is necessary to pay great attention to it, and consult a doctor for a clear diagnosis in time.