Coronary heart disease is a kind of ischemic heart disease, the severity of coronary heart disease can be judged by the degree of pain, time, frequency of attacks, etc., as well as the examination. 1. Clinical manifestations: If the patient has fewer episodes of chest pain, short duration, clear triggering factors, and can be relieved by resting or taking medication, it generally belongs to stable angina, which is a mild condition. If the pain attacks are more frequent, last longer, and can occur at rest, or if the chest pain is accompanied by changes in cardiac function and blood pressure, it is unstable angina pectoris, which belongs to a more severe condition. If the pain is severe, with pressure, dying feeling, and continue to be unable to relieve, medication, rest can not be relieved, mostly acute myocardial infarction attack, it belongs to the serious coronary heart disease, need to be sent to the hospital in a timely manner. 2. Relevant examinations: for example, if troponin is positive, myocardial enzyme spectrum, BNP is high, cardiac ultrasound shows that cardiac function is declining, and ECG ST-T change is serious, then it belongs to more serious coronary heart disease, in addition, coronary artery angiography or CT can also determine the severity of coronary heart disease. It is recommended that patients with angina pectoris, chest pain and other symptoms of coronary heart disease should seek medical diagnosis and treatment without delay.