Patients with type 2 diabetes, no matter whether they take injections or medication, are prone to complications only when their blood sugar control is unstable, and the focus is on controlling blood sugar and choosing the appropriate treatment plan according to their condition. Patients with type 2 diabetes mellitus have high blood sugar due to the relative insufficiency of insulin secretion in the body, and can choose medication to control blood sugar, such as metformin, acarbose, etc. Usually, when the medication does not control the blood sugar satisfactorily or when the condition is more serious, the use of insulin injection subcutaneous injection of hypoglycemic treatment can be considered. Poor glycemic control in diabetes can lead to complications. Complications of diabetes include macrovascular complications such as coronary atherosclerosis and aortic sclerosis, and microvascular lesions including fundopathy and nephropathy. Whether using oral hypoglycemic drugs or insulin injections, as long as the blood glucose control is stabilized, it is usually not easy to develop complications. For patients with diabetes mellitus, it is recommended that they consult an endocrinologist for treatment under the supervision of a physician.