There are many reasons why blood glucose stubbornly does not drop, including poor dietary control, lack of exercise, improper choice of hypoglycemic drugs, failure to regularly monitor blood glucose, psychological factors or the existence of comorbidities and the use of certain drugs and other factors. 1. Poor dietary control: Diet is the basic method of controlling blood glucose, and the general principle is to determine a reasonable total energy intake, reasonably and balanced distribution of various nutrients, and to restore and maintain ideal body weight. 2. Lack of exercise: Exercise can maintain a standard body weight, improve physical and mental health and insulin sensitivity, and reduce fluctuations in blood glucose. Exercise is mostly recommended to be carried out half an hour to one hour after meals, with aerobic exercise (jogging, brisk walking, swimming, etc.) as the main focus, and should be insisted on all the time to the best of one’s ability. 3. Improper choice of hypoglycemic drugs: Patients with high blood sugar should have individualized treatment. The choice of hypoglycemic drugs should be based on the type of diabetes, pancreatic islet function, age, gender, fat and thin, blood glucose fluctuations, etc., and need to follow the doctor’s instructions to take, avoid stopping and changing drugs. 4. Failure to regularly monitor blood glucose: blood glucose monitoring helps to assess the degree of glucose metabolism disorders in diabetic patients, oral hypoglycemic agents can be monitored 2 to 4 times a week fasting or 2h postprandial blood glucose. 5. Psychological factors: psychological factors also have a great impact on blood glucose, nervousness, anxiety, etc. will make blood glucose rise, it is recommended that diabetic patients maintain psychological health. 6. Existence of comorbidities or the use of certain drugs: If diabetic patients at the same time combined with other diseases such as hypertension, and at the same time the application of other drugs such as glucocorticoids, etc., may affect the effect of lowering sugar. Seek medical advice if you feel unwell.