If a patient wakes up after fainting for a few seconds with hypoglycemia, his blood sugar can rise as long as he can eat as soon as possible, or carry out intravenous infusion of glucose solution, and if there is no underlying disease, it is usually not life-threatening. However, when a hypoglycemic patient’s coma lasts for a long time, it will cause irreversible brain damage, and then it will easily cause the patient’s death. Hypoglycemia is defined as blood sugar below 2.8 mmol/L in normal people. For diabetic patients who are receiving oral hypoglycemic drugs and insulin treatment, blood sugar below 3.9mmol/L is considered hypoglycemia. Typical hypoglycemia mainly manifests as symptoms of sympathetic excitement such as panic, pale face, sweating, weakness, hand trembling, and hunger feeling. Atypical hypoglycemia symptoms can be manifested as mental and behavioral abnormalities, babbling and memory loss, etc. Attention should be paid to differentiation. When hypoglycemia is not treated in time, it will enter into hypoglycemic coma. If the patient can eat or be treated with intravenous glucose infusion through others, the symptoms can be improved significantly and the blood sugar can rise, which is usually not fatal. However, if the patient does not receive timely treatment after the hypoglycemic coma, the coma will last for a certain period of time and cause irreversible brain damage and even death. Once diabetic patients feel the early symptoms of hypoglycemia, they should eat immediately. When going out, it is recommended to carry candy and other foods that can raise blood sugar quickly to avoid the occurrence of hypoglycemia. Older people can carry a first aid card with them, indicating that they are diabetic patients, and once they are in a hypoglycemic coma, it is conducive to early and timely rescue and early correction of hypoglycemia. Reduce the harm of hypoglycemia.