Whether it is better to take medicine or inject insulin for diabetes should be decided by combining the patient’s own situation, each patient’s treatment program is different, and the program that suits you is the best. Type 1 diabetes is caused by absolute lack of insulin and requires insulin injections for supplemental treatment. type 2 diabetes can be treated with oral hypoglycemic agents such as metformin and acarbose according to their own conditions. type 2 diabetes can be treated with insulin in cases where the blood glucose control goal is still not reached by oral hypoglycemic agents, or in cases where there are severe acute or chronic complications of diabetes. Gestational diabetes mellitus is mainly controlled by diet and exercise, and insulin treatment is usually chosen when blood glucose is too high. The common adverse reaction to insulin is hypoglycemic reaction, there will also be allergic reaction, edema, weight gain, refractive error, as well as redness, swelling and warmth of the skin at the site of injection, and prolonged injection in the same area may lead to lipoatrophy. Different kinds of oral hypoglycemic drugs have different adverse reactions and contraindications, and should be selected under the guidance of a doctor in conjunction with their own situation. Diabetic patients should seek timely medical treatment, the doctor to decide the treatment plan, not self-medication.