Coronary artery disease refers to heart disease caused by coronary atherosclerosis that blocks blood vessels, resulting in myocardial ischemia and hypoxia, as well as functional changes (spasm) in the coronary arteries. Coronary artery disease can be divided into five clinical types: 1. asymptomatic type: there are changes in the electrocardiogram, but no symptoms, no myocardial necrosis; 2. angina pectoris type: there are manifestations of chest pain, no myocardial necrosis; 3. myocardial infarction type: coronary artery occlusion, acute myocardial ischemic necrosis; 4. ischemic cardiomyopathy type: myocardial fibrosis due to cardiac ischemia, which in turn leads to heart enlargement, heart failure, and arrhythmia; 5. sudden death type 5. Sudden death type: myocardial ischemia causing cardiac arrest. Asymptomatic coronary artery disease and angina pectoris coronary artery disease can develop into myocardial infarction coronary artery disease and sudden death coronary artery disease, and once they develop into the above two conditions, they can be life-threatening, so early detection of coronary artery disease and intervention is one of the key steps to reduce coronary artery disease deaths. Most patients with angina pectoris have typical chest pain, i.e. pressure, tightness, burning sensation in the precordial region or behind the upper or middle part of the sternum, which may be accompanied by pain or discomfort in the left shoulder, left inner arm, ring finger, little finger, or even neck, pharynx or jaw, and the pain can be relieved by nitroglycerin within a few minutes; meanwhile, some patients have angina pectoris attacks with only discomfort in the pharynx or back of the shoulder. When only pharyngeal discomfort or discomfort in the back of the shoulder, especially in elderly or diabetic patients, the sensitivity to pain is reduced, and there may be only chest tightness during the attack of chest pain; from the above, the attack of angina can be manifested as a variety of symptoms, not simply pain in the precordial area, regardless of the appearance of any one symptom, it should be taken seriously and further examined. At present, the most direct and golden indicator to clarify the existence of coronary artery lesions is selective coronary angiography, which is a minimally invasive interventional procedure that can directly clarify the existence of coronary artery stenosis; generally speaking, it is believed that a stenosis of 70%-75% or more of the coronary artery lumen diameter will seriously affect the blood supply, and a stenosis of 50%-70% is also meaningful. In general, it is believed that a stenosis of 70%-75% or more of the lumen diameter of the coronary artery can seriously affect the blood supply. According to the results of coronary angiography, if there is indeed a lesion, it should be treated with medication, stenting or coronary artery bypass surgery accordingly. Of course, not all chest pains are heart-related and need to be differentiated from other chest pains, but as the age of onset of coronary heart disease advances and the number of onset increases, people with chest pain symptoms (whether typical or not) should go to the hospital as soon as possible to exclude angina pectoris. Asymptomatic people should also have regular ECG checkups, as well as control blood pressure, blood sugar, blood lipids, quit smoking, healthy diet and proper exercise.