Heart disease is caused by narrowing of the lumen of the coronary arteries that supply the heart itself due to the formation of atheromatous plaque in the walls of the coronary arteries. The clinical symptoms vary depending on the number of branches and degree of coronary artery stenosis. The cause of this disease is still not fully understood, but it is thought to be related to hypertension, hyperlipidemia, hyperviscosity, diabetes mellitus, endocrine hypofunction and old age. Hyperlipidemia (15%): In addition to age, disorders of lipid metabolism are the most important predictors of coronary heart disease. There is a close relationship between total cholesterol (TC) and low-density lipoprotein cholesterol (LDLC) levels and the risk of coronary heart disease events; a 1% increase in LDLC levels increases the risk of coronary heart disease by 2-3%. Triglyceride (TG) is an independent predictor of coronary heart disease and is often associated with low HDLC and abnormal glucose tolerance, the latter two also being risk factors for coronary heart disease. Hypertension (15%): Hypertension is closely related to the formation and development of coronary atherosclerosis. Systolic blood pressure is a better predictor of coronary events than diastolic blood pressure. 140-149 mmhg systolic blood pressure increases the risk of death from coronary heart disease more than 90-94 mmhg diastolic blood pressure. Age and sex (25%): The incidence of coronary heart disease increased after the age of 40 years, and was lower in women than in men before menopause and equal to men after menopause. Smoking (10%): Smoking is an important risk factor for coronary heart disease and is the single most avoidable cause of death. There is a clear dose-response relationship between coronary heart disease and smoking. Diabetes (15%): Coronary heart disease is the leading cause of death in underage diabetics, accounting for nearly 80% of all deaths and hospitalizations in diabetic patients. Obesity (20%): has been identified as the primary risk factor for coronary heart disease and can increase coronary heart disease mortality. Obesity is defined as body mass index (BMI = weight (kg)/height squared (m2)) in men = 27.8, women = 27.3. BMI is positively correlated with increased TC, TG, and decreased HDL-C. Sedentary lifestyle: the risk of coronary heart disease and death will be doubled in people who do not exercise. There are also genetic, alcohol consumption, and environmental factors.