What are the advantages and disadvantages of injecting insulin into diabetic patients?

Injecting insulin can lower blood sugar. For diabetic patients with long-term hyperglycemia, lowering blood sugar reduces the possibility of complications caused by hyperglycemia. At the same time, if insulin injection is used to control blood sugar, diabetic patients can also let go of their diet appropriately. However, we must grasp the dose of injection. If you don't grasp the dose of injection, too much injection will lead to too much blood sugar drop, and hypoglycemia is very harmful to diabetic patients.