The duration of fainting due to hypoglycemia depends on the patient’s condition. In mild fainting, the patient is conscious and usually gets better with proper sugar supplementation. However, in case of severe coma, the duration of fainting may be slightly longer, even up to 1-2 hours. Severe hypoglycemia may result in fainting, and the symptoms can be recovered after timely correction of hypoglycemia. However, if hypoglycemia cannot be effectively treated for a long time, it can lead to hypoglycemic coma, which can induce acute myocardial infarction and acute cerebral infarction in serious cases, and even cause death in severe cases. If hypoglycemia lasts for more than 6 hours, it can cause irreversible brain damage and even enter a vegetative state. However, for general patients with severe hypoglycemic coma, blood sugar can rise significantly within half an hour by intravenous injection of 50% glucose injection, and the patient’s consciousness gradually turns to be awake. In addition, it is recommended that diabetic patients carry with them sugar cubes, cookies and other foods with high sugar content, so that once the symptoms of hypoglycemia appear, they can be corrected in time. However, if coma occurs, the patient should be sent to the hospital emergency department or endocrinology department for treatment in time, and should not be fed through the mouth to avoid choking.