Cardiac ischemia includes two concepts: 1, ischemia occurs in the myocardial cells of the heart itself, and its lesion is caused by the lesion of the myocardial cells themselves; 2, it is caused by insufficient blood supply, i.e., poor blood flow or occlusion or narrowing of the coronary arteries, so that blood flow cannot be supplied to the myocardial cells, and this condition is called myocardial ischemia. The most common clinical condition is caused by poor blood flow and inability to deliver blood to the myocardial cells due to problems in the blood vessels themselves. This condition is called coronary artery disease, or coronary atherosclerotic heart disease, and requires comprehensive treatment. Depending on the degree of stenosis, stent implantation or coronary artery bypass grafting can be chosen based on medication and lifestyle modification. In addition, myocardial ischemia caused by the dysfunction of the cardiomyocytes themselves, clinically common are myocarditis or alcoholic cardiomyopathy, congenital hereditary cardiomyopathy, such as dilated cardiomyopathy and hypertrophic disease, which can also cause myocardial ischemia in this case. This treatment also varies depending on the type of disease it is, and it is recommended that a series of tests be performed inside the hospital to clarify the cause of the lesion.