Diabetes mellitus is a chronic complication with elevated blood glucose. Diabetic patients are prone to acute complications such as ketoacidosis and hyperosmolar coma, as well as chronic complications such as heart, brain, kidney, nerve, and fundus, which can lead to death in severe cases. The main causes of death in diabetic patients are as follows: i. Acute complications, diabetic patients with significantly elevated blood sugar are prone to complications such as diabetic ketoacidosis, hyperosmolar coma and lactic acidosis, all of which are diabetic emergencies that require active treatment and can be life-threatening in severe cases, leading to the death of the patient. Second, hypoglycemia, diabetic patients who are receiving oral hypoglycemic drugs or insulin therapy, when the diet is irregular or the dose of drugs is too high, hypoglycemia can easily occur, and in serious cases, hypoglycemic coma can occur, leading to the death of the patient. Third, cardiovascular disease, diabetic patients are prone to combined macrovascular disease, cerebral infarction, coronary heart disease, angina pectoris, myocardial infarction, etc., can affect the lives of patients, leading to death. Diabetic nephropathy, when the patient complicates diabetic nephropathy, renal insufficiency, uremia will affect the life of the patient, leading to death. Fifth, other, diabetic patients with other diseases, such as serious infections can also lead to the death of patients.