Coronary heart disease refers to the narrowing or blockage of the coronary arteries, leading to ischemia, hypoxia, or even necrosis of myocardial cells, which is a type of heart disease. Its full name should be coronary artery atherosclerotic heart disease, commonly known as coronary heart disease. Coronary heart disease can be divided into five types: The first type is occult or asymptomatic coronary heart disease. The second type is angina pectoris, the third type is myocardial infarction, the fourth type is ischemic cardiomyopathy, and the fifth type is sudden death. Among these, patients with occult or asymptomatic coronary heart disease may not have obvious symptoms or any symptoms at all, so a person without symptoms does not necessarily mean they do not have coronary heart disease. Whether a patient has coronary heart disease should still be determined by a specialist based on relevant examinations.