Hypoglycemia refers to the decrease of glucose level in plasma below normal, which can be manifested as panic, fatigue, cold sweat, etc. in early stage, and epilepsy, alteration of consciousness, death, etc. in severe cases. Hypoglycemia can be seen in insufficient eating, liver cirrhosis, insulinoma, tumor, improper application of hypoglycemic drugs, etc. Therefore, the symptoms of hypoglycemia are mostly accompanied by the manifestations of the original disease. 1. If hypoglycemia is caused by simple underfeeding, it can be manifested as panic, fatigue, cold sweat and so on. 2. Cirrhosis patients can lead to hypoglycemia due to the obstacle of sugar utilization by liver, besides palpitation and fatigue, patients can also manifest jaundice, ascites, loss of appetite, generalized edema, etc. 3. Insulinoma can lead to hypoglycemia due to the increase of insulin secretion, and it is often accompanied by endocrine abnormality, which manifests as excessive gastric acid, peptic ulcer, and brain dysfunction, such as consciousness disorder, epileptic seizure, and coma in serious cases. 4. Malignant tumors cause hypoglycemia due to enhanced body metabolism, increased utilization of sugar, high consumption, resulting in fatigue, poor appetite, manifested as malignant fluid state, which can be life-threatening in serious cases. 5. Improper application of hypoglycemic drugs, when the dose of hypoglycemic drugs is too large, it can lead to hypoglycemia, which is manifested as cold sweat, fatigue, etc. If hypoglycemia occurs, it is recommended to apply hypoglycemic drugs immediately. If hypoglycemia occurs, it is recommended to rest immediately, replenish sugar in time, and actively seek medical treatment to avoid delaying the condition.