Also called low blood glucose, a condition that occurs when one's blood glucose is lower than normal, usually below 70 mg/dl. Signs include hunger, nervousness, shakiness, perspiration, dizziness or light-headedness, sleepiness, and confusion. If left untreated, hypoglycemia may lead to unconsciousness. Hypoglycemia is treated by consuming a carbohydrate-rich food such as glucose tablets or juice. Hypoglycemia may also be treated with an injection of glucagon if the person is unconscious or unable to swallow. Also called an insulin reaction.