The criteria for hypoglycemia are broadly divided into two cases. Generally speaking, if a person’s blood sugar is lower than the standard blood sugar, it is called hypoglycemia, and the standard of hypoglycemia is different due to the different blood sugar situation of the inaccessible people. The standard of hypoglycemia for general population is blood glucose concentration lower than 2.8mmol/L. For patients with diabetes, blood glucose concentration lower than 3.9mmol/L is considered as hypoglycemia. Long-term low food intake, strenuous exercise, heavy diarrhea, and overuse of hypoglycemic drugs can all lead to hypoglycemia, which in turn leads to sympathetic excitation and central nerve damage, showing a series of symptoms. When diagnosing hypoglycemia clinically, in addition to blood glucose lower than the standard value, the treatment method should be selected by combining with clinical manifestations.1. Sympathetic excitation: Patients mainly suffer from symptoms such as panic, sweating, hunger, cold sweat, etc. Some patients can also show symptoms such as hand trembling, panic, dizziness, nausea and vomiting. If patients are conscious, they should immediately give glucose water, brown sugar water, small cookies, small snacks, sweet drinks, snacks, cakes and other foods with high sugar content to make blood sugar rise as soon as possible. If the blood sugar does not rise 10 minutes after taking the above food, it should be taken again in order to correct the hypoglycemia as soon as possible; 2. Central nervous system damage: a more serious clinical manifestation of hypoglycemia is hypoglycemic coma. At this time, do not feed the patient any food containing sugar, and do not drink water, because at this time the patient loses consciousness, and force-feeding food can easily lead to choking and choking, which endangers the patient’s life. The patient should be taken to hospital immediately and glucose or adrenocorticotropic hormone or glucagon should be injected intravenously to make the patient out of danger quickly. If the hypoglycemic coma lasts for 6 hours without correction, it is easy for the patient to enter a vegetative state, and in severe cases, it can directly endanger the patient’s life.