Hypertension, diabetes, and smoking can damage the endothelium of blood vessels, and lipids are deposited under the endothelium, gradually forming plaques and causing narrowing or blockage of the coronary artery lumen. A man in his 40s always felt tightness in his chest when he went upstairs every day and was forced to stop climbing, which was relieved after three to five minutes of rest and he could continue climbing. Later, he went to the hospital for examination, and the coronary CT showed moderate to severe stenosis of the coronary arteries, which belonged to coronary heart disease. Coronary heart disease, the full name is coronary heart disease. The artery that supplies blood to the heart muscle is called coronary artery, and any factor that causes narrowing of the coronary artery lumen leading to insufficient blood supply can be called coronary heart disease. The most common form of coronary heart disease is a narrowing of the coronary artery lumen caused by atheromatous plaque, which can lead to myocardial ischemia. Why does atheroma form in the coronary arteries? Because risk factors such as hypertension, diabetes and smoking can damage the endothelium of blood vessels, and lipid deposits under the endothelium can gradually form plaques and cause narrowing or blockage of coronary artery lumen. Coronary heart disease can be divided into two categories: chronic and acute. Chronic coronary artery disease mainly refers to stable angina, where plaque progresses slowly and myocardial ischemia is caused when the lumen obstruction reaches a certain level, and when blood cannot meet the needs of the myocardium, angina symptoms will arise due to myocardial ischemia. Acute coronary heart disease, also known as acute coronary syndrome, includes unstable angina and acute myocardial infarction. Sudden rupture of unstable plaque promotes clotting, platelets gather at the rupture site, and a large number of clotting factors gather at the rupture site, leading to acute occlusion of the lumen and sudden interruption of blood supply to the myocardium, causing acute myocardial infarction. Acute myocardial infarction can lead to acute heart failure, malignant arrhythmia, heart rupture and other serious consequences, and is an important cause of sudden death. Even after passing the acute phase, there is a long-term risk of heart failure. Stable angina can also progress to unstable angina or sudden acute myocardial infarction. In the United States, heart disease is the number one cause of death. The China Cardiovascular Disease Report 2013 shows that the mortality rate of acute myocardial infarction in China is increasing significantly, especially in rural areas, with a rapid upward trend since 2005. The risk factors of coronary heart disease are hypertension, diabetes, hyperlipidemia, smoking, and family history of early-onset coronary heart disease. At present, there are 270 million hypertensive patients in China, and the blood pressure control rate is less than 10%. 2010 Chinese chronic disease monitoring program shows that the overweight and obesity rate of Chinese adults is 42.6%, the prevalence of diabetes is 11.6%, and the rate of adults who regularly participate in physical exercise is only 11.9%. The China Health and Nutrition Survey shows that the cholesterol intake of the population has increased significantly. It is expected that the incidence and mortality of coronary heart disease in China will increase significantly in the coming decades, and the incidence of the population has a tendency to be younger.