Fasting blood glucose 3.89-5.90, less than 5.60 is good, postprandial blood glucose less than 7.80 Normal people fasting blood glucose: 3.3 ~ 6.1 mmol / L (60 ~ 110mg / dl) Normal people 2 hours after the meal blood glucose: < 7.8 mmol / L (140mg / dl) If the blood glucose is higher than normal is known as hyperglycemia. If the blood sugar is higher than normal, it is called hyperglycemia. In our hospital, if the blood sugar is higher than 6.11 mmol/L, it is called elevated blood sugar. The results may vary slightly from hospital to hospital due to differences in reagents, machines, and testing methods, but the differences are not significant. If hyperglycemia persists, it will cause damage to various organs and tissues of the body. The patient will feel sick all over the body and often show signs of fatigue, thirst, drinking a lot of water and urinating a lot. If the situation is serious, medical attention should be sought as soon as possible. Common causes of high blood sugar include: (1) too little exercise and insufficient pancreatic function; (3) excessive food intake, especially sweets or sugary drinks; (4) excessive obesity; (5) excessive emotional or mental stress; (6) alcohol consumption; (8) taking certain medications, such as prednisone, dexamethasone and other medications that can cause hyperglycemia; and also taking certain cough syrups; (9) in the event of illness or other emergencies, the original insulin used may be too high, and the patient will not have enough blood sugar to make up for it. (9) In case of illness or other emergency, the dose of insulin or oral hypoglycemic drugs used previously is not enough.