Clinically there is no best location for insulin injections, insulin needles should be injected subcutaneously, the recommended locations to choose are abdomen, buttocks, outer thighs, upper arms, usually the abdomen is chosen. When injecting insulin, the abdomen should be preferred. The thicker subcutaneous fat layer in the abdomen can minimize intramuscular injections, thus less likely to cause hypoglycemic symptoms in patients. When injected subcutaneously, the abdomen has the fastest absorption rate, and the larger area of the abdomen makes it easy to inject. In order to better control postprandial blood glucose, one should choose to inject insulin before meals in the abdomen with the fastest absorption rate, so as to make insulin take effect more quickly. If it is for controlling fasting blood glucose the next morning, you should choose the buttocks, upper arms, outer thighs, etc., so that the insulin can exert its effect smoothly and slowly. When injecting insulin, care should be taken to alternate injections at different sites so as not to affect the absorption effect of insulin. Insulin should be injected according to the doctor’s instructions, and should not be used blindly so as not to cause adverse effects. When discomfort occurs, you should consult a doctor in time.