Hyperglycemia may be caused by the following reasons: first, drinking alcohol will reduce diet and increase satiety, but alcohol can be absorbed and metabolized quickly, which can not maintain blood sugar level for a long time, which will lead to an increase in blood sugar. Second, taking some hormone drugs, such as prednisone and dexamethasone, will increase blood sugar. Third, excessive pressure, emotional and mental tension, and ups and downs of emotions will make some organs in the human body unable to function normally, causing internal environment disorder and high blood sugar. Fourth, due to obesity, eating too much will lead to obesity, which will easily lead to an increase in blood sugar. 5. Due to improper diet and excessive intake, especially sweets and sugary drinks, the sugar content in the human body is significantly higher than the normal standard, and at the same time, blood lipids will increase, leading to hyperglycemia. 6. Due to the decrease of exercise, if insulin can't work effectively due to the sudden decrease of exercise, blood sugar will also rise.