Insulin overdose can kill quickly. Insulin is the only hormone in the body that directly lowers blood sugar. If too much insulin is used, it leads to acute hypoglycemic reaction in the body, with symptoms such as hunger, panic and sweating, trembling hands, weakness around the body, pale face, dizziness, chest tightness and shortness of breath, etc. If glucose or food, such as sugar cubes, cookies and bread, is not replenished in time, blood sugar will continue to fall, making brain cells lack sugar, leading to hypoglycemic brain damage and Drowsiness, mental abnormalities or even coma and death will occur. Therefore, when diabetic patients inject insulin, they must not increase the insulin dose at will, and at the same time, when injecting insulin, remember to eat on time and have staple food.