There are four main types of diabetes: type 1 diabetes, type 2 diabetes, gestational diabetes and secondary diabetes, the first two being the most common. Type 1 diabetes accounts for about 5-10% of all cases of diabetes and occurs mostly in adolescents. It is caused by the destruction of a large number of pancreatic ß-cells, which significantly reduces or prevents the production of insulin, resulting in a continuous increase in blood glucose. Type 2 diabetes is the most common type of diabetes, accounting for more than 90% of the total number of people with diabetes, mostly occurring in people over 40 years of age, but now there are more and more young people. In general, there is no need to inject insulin, only oral hypoglycemic drugs, and even diet management plus moderate exercise can control blood sugar, once called non-insulin-dependent diabetes, but with the growth of the disease years, the pancreatic ß-cell function will gradually fail, so that part of the type 2 diabetic patients eventually need to inject insulin to maintain life; gestational diabetes accounts for about 2-3% of pregnant women, generally occurring in the second trimester of pregnancy, most of which can return to normal after delivery. Postpartum weight is an important factor in predicting whether this type of patient will develop overt diabetes later in life. When patients know they have diabetes, they are often anxious to know which type of diabetes they have. They believe that type 1 diabetes is more serious and scary. In reality, this is not the case. The current typing of diabetes is based primarily on its cause, not the severity of the disease. After the introduction of insulin, type 1 diabetes is not an incurable disease.