When the blood glucose level of a normal person falls below 2.8mmol/L, or for diabetics below 3.9mmol/L, it is referred to as hypoglycemia. Hypoglycemia refers to a clinical syndrome caused by an abnormally low glucose concentration in the blood due to various reasons. Clinically, it primarily manifests through symptoms stimulated by the sympathetic nervous system and affects on the central nervous system. Typical signs of hypoglycemia include excessive sympathetic nervous excitement, such as sweating, hunger, palpitations, trembling, and paleness. Additionally, there are manifestations of brain dysfunction, initially presenting as lack of concentration, slow thinking and speech, dizziness, drowsiness, restlessness, irritability, and bizarre behavior. In severe cases, seizures, coma, and even death may occur.