Coronary artery disease, also known as coronary atherosclerotic heart disease, can be asymptomatic in its early stages, showing only changes in the ST-T segment during an electrocardiogram, or angina pectoris, a crushing pain in the precordial region, often accompanied by chest tightness, breath-holding, or radiating pain to the neck, ear, or even the back, after strenuous exercise. Patients with angina can usually relieve it on their own after rest, or quickly after taking nitroglycerin. Coronary artery disease is caused by a narrowing of the coronary arteries resulting in inadequate blood supply to the heart, which tends to worsen especially during exercise. The risk factors for coronary heart disease are not only genetics and age, but also hypertension, hyperlipidemia, diabetes and obesity, etc. The control of these risk factors can effectively help prevent the occurrence and development of coronary heart disease. Coronary heart disease is more likely to occur in people over 40 years of age, but in recent years there has been a trend toward younger people. In daily life, you should develop good eating habits, eat more vegetables and fruits, reduce fat intake, stop smoking and drinking, exercise properly, maintain a healthy weight, and have regular medical checkups to control blood pressure, blood sugar and blood lipids in the normal range. If an abnormal electrocardiogram is found during a physical examination, you should seek medical attention in a timely manner to prevent gradual aggravation without realizing it.