Diabetes, if you do not take medication and timely treatment, will lead to a variety of acute complications such as ketoacidosis and chronic complications such as diabetic nephropathy, coronary heart disease, etc., and some of the acute complications have the possibility of death, the patient needs to pay attention to, and strictly in accordance with the doctor’s instructions to take medication. 1. Acute complications of diabetes mellitus: including diabetic ketoacidosis, hyperglycemic hyperosmolar state, these two acute complications come ferociously, not timely treatment may lead to death, more dangerous. 2. Chronic complications of diabetes mellitus: including diabetic macrovascular disease and diabetic microangiopathy. Diabetic macrovascular lesions involve cardiovascular and cerebrovascular vessels, can induce coronary heart disease, cerebral infarction, etc.; diabetic microvascular lesions can lead to diabetic nephropathy, diabetic ophthalmopathy, etc., diabetic nephropathy can lead to uremia in severe cases. Therefore, once diagnosed with diabetes mellitus, the patient must actively carry out the treatment, follow the doctor’s instructions for medication, only active control of blood glucose, in order to delay and avoid the occurrence of complications.