Insulin is a hypoglycemic hormone, which is injected by diabetic patients to control blood sugar and treat diabetes. After injecting insulin, if hypoglycemia occurs, sugary substances should be given or emergency medical treatment should be taken according to the specific situation in order to correct the symptoms of hypoglycemia so as to avoid adverse consequences. If the symptoms are relatively mild and the patient is conscious and only has symptoms such as panic, sweating, and slurred speech, the patient can be given glucose water, honey water, small snacks, small cookies, milk candies, cakes, chocolates, and other foods to alleviate the symptoms. Normally, after 15 minutes, blood sugar can gradually return to normal. If the patient’s symptoms are more serious and hypoglycemic coma occurs, the patient should not be fed to raise the blood sugar, so as to avoid choking and suffocating, which may endanger the patient’s life. At this time, the patient should be immediately sent to the hospital, intravenous glucose or glucagon, so that the patient out of the danger of hypoglycemia. Usually, hypoglycemia caused by insulin injection is generally due to the failure to eat in time after insulin injection or the decrease in the amount of meals. Patients should maintain good dietary habits and take in food at regular intervals every day. In addition, patients can also suffer from hypoglycemia when too much insulin is administered during the injection process. This situation often indicates that the treatment plan is unreasonable, and must follow the doctor’s instructions to readjust the insulin and improve the treatment, such as reducing the amount of insulin, adding part of the oral hypoglycemic drugs, or adding part of the insulin sensitizer, and so on.