Insulin is an important method to control blood glucose in diabetic patients. The following are the conditions that require daily insulin injections: 1. Type 1 diabetes, which mostly occurs in adolescents, is dominated by insulin deficiency and prone to diabetic ketoacidosis, and requires multiple daily subcutaneous insulin injections to control blood glucose. Type 2 diabetes mellitus requires daily subcutaneous insulin injections to control blood glucose when blood glucose rises significantly, when serious acute and chronic complications are combined, and during the perioperative period. Gestational diabetes requires daily subcutaneous insulin injections several times during pregnancy to effectively control blood glucose and ensure the health of the mother and fetus. Some special types of diabetes, such as diabetes after recurrent pancreatitis, steroid diabetes, diabetes with a thin body type that is difficult to classify, also need daily subcutaneous insulin injections to control blood glucose.