The time for a patient who faints from hypoglycemia to wake up is mainly determined by the degree of hypoglycemia and whether the patient is rescued in time. Most patients can usually wake up in 15-30 minutes if they are rescued and treated in time. In the case of patients with severe hypoglycemia, it may take up to 1 hour, and if not treated in time, more than 6 hours may develop to vegetative state and endanger the patient’s life and health. When hypoglycemia occurs, there are two kinds of manifestations, sympathetic excitement and hypoglycemic coma: 1. Sympathetic excitement: Patients show symptoms such as panic, sweating, hunger, dizziness, weakness and vomiting. If consciousness is clear, glucose water and sugary food are given immediately, and most patients can regain wakefulness in about 10 minutes; 2. Hypoglycemic coma: when patients appear in hypoglycemic coma, they should not be fed glucose water or sugary food to avoid choking. Medical attention should be sought as soon as possible to infusion of glucose or adrenocorticotropic hormone as well as blood glucose raising hormone, most patients can have their symptoms relieved and can wake up in about one hour or so. If you seek medical attention too late, hypoglycemia lasts too long, more than 6 hours will endanger the patient’s life. After patients with hypoglycemia wake up, they must be tested for the cause of hypoglycemia, which is mostly seen in diabetic patients who did not eat in time after medication, or in patients with islet cell tumors. In addition, hypoglycemia can be induced by violent vomiting in pregnancy and patients with cachexia, and the causes should be identified and avoided as much as possible.