Generally, the blood sugar of diabetic patients below 3.9mmol/l is called diabetes combined with hypoglycemia. Patients with hypoglycemia often show clinical symptoms of sympathetic excitement, mainly manifesting as panic, hand trembling, weakness, hunger, and some patients may have blurred vision and abnormal behavior. If carbohydrates are given early, the symptoms of hypoglycemia can be corrected as soon as possible. If the patient is not corrected in time, it can lead to severe hypoglycemia, and the patient may show abnormal behavior as well as seizures. Elderly patients tend to be insensitive to the responsiveness of hypoglycemia and do not have the above-mentioned symptoms of sympathetic excitation, and often have no protective mechanism to correct hypoglycemia by giving food in time, so patients often show symptoms of hypoglycemia such as coma and impaired consciousness.