If blood sugar is not well controlled, the chance of myocardial infarction is the same as that of coronary heart disease. Instead of waiting for coronary artery stenosis and placing stents, it is better to actively control blood sugar to prevent the occurrence and development of coronary heart disease. What’s more, many diabetic patients have diffuse stenosis, and there is no way to place stents. Diabetic cardiac lesion refers to diabetes-related cardiac lesion, which is a serious late complication in diabetic patients and is the main cause of death in diabetic patients. It mainly includes: coronary atherosclerotic heart disease, diabetic cardiomyopathy and diabetic cardiac vegetative neuropathy. Among them, coronary heart disease is the most common. The clinical characteristics of diabetic coronary artery disease are high incidence, early onset and high mortality rate. The incidence of coronary heart disease is two to four times higher in diabetic patients than in non-diabetic patients. The specific reasons for the increased incidence of coronary heart disease in diabetic patients are not yet clear, but it is well established that diabetes is prone to atherosclerosis. Obesity, hypertension, hyperlipidemia, hyperglycemia, hyperfibrinemia and hyperinsulinemia (i.e. insulin resistance syndrome) are inseparable from coronary heart disease. Obesity makes the body resistant to insulin, and in order to ensure normal blood glucose levels, pancreatic islet cells must secrete several times or even dozens of times more insulin than normal people, forming hyperinsulinemia, which eventually leads to elevated blood glucose, elevated blood lipids, and elevated plasma fibrinogen, all of which are risk factors for atherosclerosis. In addition, some clinical symptoms of coronary heart disease appear later or are masked in diabetic patients with complications of coronary heart disease because diabetic neuropathy can involve any part of the nervous system, especially the nerve endings. When the patient’s nerve endings are damaged, sensitivity to pain is reduced, and even when severe myocardial ischemia occurs, the pain is milder and less typical, and there are even no angina symptoms. To put it more graphically, diabetes is unknowingly in love with coronary heart disease. Therefore, diabetic patients should be aware that their risk of combined cardiovascular disease is higher than that of the normal population, and should achieve early diagnosis and early intervention in order to reduce the occurrence of acute myocardial infarction. To prevent and treat diabetic cardiac lesions, we must first detect diabetes early, strictly control blood sugar in time, correct high blood clotting status, control blood pressure, correct hyperlipidemia, eat less animal fat and food containing high cholesterol, and properly carry out physical activities and maintain an optimistic and positive attitude. In case of acute myocardial infarction and heart failure, the patient should be sent to hospital for treatment in time.