Hypoglycemia is a physiological or pathological condition in which the blood sugar in a person’s body falls below the normal low limit causing corresponding symptoms and signs. This value is artificially set to reflect the fact that hypoglycemia can occur in most people when their blood sugar falls below this value and can vary from person to person. Manifestations of hypoglycemia occurring: Panic, sweating, hunger, weakness, hand tremors, blurred vision, pale face. Headache, dizziness, disorientation, slurred speech, mental disorder, impaired consciousness, and even coma. The more horrible manifestation of hypoglycemia: no aura such as panic, sweating, hunger, etc., directly coma (unconscious hypoglycemia). Remember: If the duration is long (generally >6 hours) and the symptoms are severe, it can lead to damage to the central nervous system, and even irreversible. It is possible to never wake up (vegetative state). The danger of hypoglycemia: coronary heart disease, cerebrovascular disease, all-cause mortality increase. Common causes of hypoglycemia: improper insulin use; overdose of oral hypoglycemic drugs; adrenal, thyroid or pituitary failure; excessive exercise (too long, sudden); inadequate food intake, taking medication at mealtime, not eating after the injection; liver and kidney failure, resulting in reduced clearance of insulin and hypoglycemic drugs; diabetic pregnant women at the end of childbirth, and while breastfeeding. Risk factors predisposing diabetics to severe hypoglycemia: intensive insulin therapy; unconscious hypoglycemia; long years of diabetes; elderly patients, maintaining the level of glycemic control in young people; alcohol consumption; failure to monitor blood glucose at night and failure to detect hypoglycemia during sleep. Prevention of hypoglycemia: eat at the right time and in the right amount, live a regular life; do not increase the dosage of medication casually; check the dosage carefully every time you use insulin; exercise a constant amount; test blood sugar frequently; carry candy with you for emergency use. Wear a warm reminder card (name, age, diabetes, if you faint, please feed me sugar or send me to the hospital for sugar infusion). After the occurrence of hypoglycemia if you correct it by eating candy or eating by yourself, you still need to seek help from the hospital to analyze the reason of hypoglycemia occurrence and prevent it from happening again.