Coronary artery disease, or coronary atherosclerotic heart disease, is a heart disease in which pathological changes in the coronary arteries lead to narrowing or blockage of the official lumen of the coronary arteries resulting in inadequate blood supply to the heart muscle, hypoxia or infarction. Risk factors for coronary heart disease include hypertension, hyperlipidemia (accumulation of fat, cholesterol, triglycerides and other substances in the lumen of blood vessels), diabetes, and smoking. There are significant local disparities in the incidence of coronary heart disease, generally higher in the north than in the south, and higher in urban than in rural areas. The diagnosis of coronary heart disease generally relies on typical clinical symptoms, such as sudden chest pain during emotional agitation, manifested as crushing pain or colic, which usually starts from behind the sternum to the precordial area and also radiates to the left shoulder, left forearm, and even the little finger and ring finger. The symptoms are relieved by sublingual nitroglycerin. Angina pectoris is its main clinical symptom, and coronary artery disease should be highly suspected if there is an angina attack. In addition, in addition to angina pectoris, nausea, vomiting, sweating, fever, even a drop in blood pressure, shock and heart failure may occur in the case of myocardial infarction. Sublingual oral nitroglycerin is usually administered promptly when these symptoms appear. ECG is the most commonly used and simplest diagnostic method, and ambulatory ECG monitoring can be performed if necessary. Echocardiography, hematology, coronary CT, coronary angiography and intravascular imaging techniques are all effective diagnostic methods for coronary artery disease. Patients with coronary heart disease should carry quick-acting heart pills with them and take them sublingually in time when they have angina. In addition, patients should pay attention to their dietary habits, eat less greasy food with high cholesterol, eat more vegetables and fruits; pay attention to their blood pressure frequently, do more physical exercise with less intensity; do not smoke, do not drink alcohol, etc.