Diabetic patients usually do not often have fever, but diabetic patients with poor glycemic control will be prone to complications of infections that cause fever. Diabetes itself does not cause fever due to elevated blood glucose, but poor blood glucose control in diabetic patients may lead to lower body resistance and easily complicate various infectious diseases, such as respiratory tract infections, urinary tract infections, etc., and infections may cause fever in the body. Diabetic patients should follow the doctor’s instructions to use metformin, acarbose and other hypoglycemic drugs to control blood glucose in the normal range, which can reduce the occurrence of vascular and neurological complications due to elevated blood glucose and reduce the probability of infectious diseases. Diabetic patients with fever symptoms should immediately go to the hospital, improve the examination, under the guidance of the doctor to use the appropriate drug treatment.