How often there are complications of diabetes is not clearly defined. Complications of diabetes are categorized into three types: acute, infectious and chronic, and the onset of complications varies according to the diabetic condition that caused them. 1. Acute complications often occur in the patient’s hyperglycemic state, the onset of time is faster and shorter, mainly divided into diabetic ketoacidosis and hyperosmolar hyperglycemic syndrome. 2. Infectious complications occur at any time during the course of the patient’s illness, especially in patients with poor glycemic control is more likely to occur, mainly skin septic infections, urinary tract infections, and so on. 3. Chronic complications such as diabetic retinopathy, neuropathy, diabetic nephropathy, etc., and whether the patient’s blood glucose control is good has a certain relationship, blood glucose control of patients may be about ten years will appear, while poor blood glucose control of patients may be 1 ~ 2 years can appear. It should be noted that diabetic patients can reduce the adverse effects of the disease through “early detection, early diagnosis, early treatment”, for diabetic patients, timely treatment under the guidance of a doctor, do not delay the condition.