If we define diabetic heart disease, we can say that diabetic heart disease refers to macroangiopathy, microangiopathy and autonomic neuropathy that occur in the heart due to diabetes mellitus, based on the long-term uncorrected disorders of multiple metabolism such as sugar and fat. The large vessels are mainly the coronary arteries located on the surface of the heart, the so-called diabetic combined coronary heart disease; the microvessels are the tiny blood vessels within the myocardium, the so-called diabetic cardiomyopathy; the abnormal form and function of the autonomic nerves that govern and regulate the movement of the heart can lead to heart rhythm disorders. All of these can lead to heart dysfunction and affect health, and among them, ischemic heart disease caused by coronary atherosclerotic heart disease (referred to as coronary heart disease) is the most common. Among patients hospitalized for a coronary event, the one-year mortality rate is two to four times higher in patients with diabetes than in those without diabetes. In women, this difference is more pronounced. Sudden death, heart failure, and reinfarction were more common in diabetic patients after a heart attack. Both in-hospital mortality from heart attack and long-term mortality were four times higher for those with blood glucose greater than 6 mmol per liter on admission than for those with blood glucose less than that. For diabetic patients, mortality was twice as high for those with glucose greater than 10 millimolar on admission as for those with less. Another prospective study of 336 patients with acute heart attack found that the one-year mortality rate was 19.3% for patients with blood glucose less than 5.6 mmol at admission, compared with 44% for those with blood glucose greater than 11 mmol. These suggest that hyperglycemia is critical to the development of coronary heart disease. In both the DCCT and UKPDS studies, there was a trend toward a decrease in the incidence of cardiovascular events in the tightly controlled glucose group. The clinical presentation of diabetic heart disease is complex. It can occur as a single condition of the three aforementioned impairments or as a crossover mixture of all three. Patients may have no clinical symptoms in the early stage, or show non-specific symptoms of autonomic dysfunction, such as dizziness, insomnia, excessive sweating and palpitations. Some are easily fatigued and experience shortness of breath, chest tightness, and cyanosis after excessive activity. Most often have symptoms of myocardial ischemia chest tightness, breath-holding, and retrosternal pain. However, diabetic patients often have painless infarction, which may have symptoms such as chest discomfort and cold sweat in addition to no chest pain. At this time, hypoglycemia should be excluded, and electrocardiogram and myocardial enzymology should be done promptly. Postural hypotension refers to the discomfort of dizziness, palpitations, profuse sweating, blackness in front of the eyes, or sudden fainting when the patient moves from a recumbent to a standing position. This is a manifestation of diabetic cardiovascular autonomic neuropathy when it occurs. Diabetic heart disease can lead to heart failure or sudden death in severe cases. Because of the high mortality rate, diabetic heart disease is certainly scary. But what is more terrible is not the diabetic heart disease itself, but more than two-thirds of diabetic patients still do not know that diabetes and coronary heart disease have a close relationship, do not know that in addition to strict control of blood sugar, diabetes also needs to strictly control blood lipids, blood pressure, but also timely correction of the body’s high blood viscosity, high blood clotting, hyperinsulinemia state. This is what we should pay attention to in order to prevent diabetic heart disease. We must not just check the blood glucose when we see a doctor, especially fasting blood glucose, but also try to control the other indicators mentioned above to normal or close to normal, or at least strictly control the most common “6 highs”, namely high blood glucose, high blood lipids, high blood pressure, high blood viscosity, high blood clotting status In order to reduce or slow down the development of diabetic heart disease, it is necessary to strictly control the most common “6 highs”, namely hyperglycemia, hyperlipidemia, hypertension, hyperviscosity, hypercoagulability and hyperinsulinemia.