Fasting blood glucose is higher than after meal, can be treated by diet, exercise and other methods of intervention. If you are taking hypoglycemic drugs or injecting insulin for treatment, you need to adjust the dosage or type of drugs under the guidance of your doctor. Usually, the normal range of fasting blood glucose for normal adults is between 3.9 and 6.1 mmol/L. If you are not taking medication for treatment and have the symptom that your fasting blood glucose is higher than your postprandial blood glucose, you can intervene by improving your diet and exercising moderately, which will increase the sensitivity of insulin and control your blood glucose within the ideal range. If the diagnosis of diabetes mellitus is confirmed and you are taking medication to lower postprandial blood glucose, such as acarbose, or injecting insulin for treatment, the dose of the medication may be too large, resulting in a drop in postprandial blood glucose, so that postprandial blood glucose is lower than fasting blood glucose. It is recommended to consult the endocrinology department in time and adjust the dosage or type of drugs under the doctor’s guidance. When the above symptoms appear, it is recommended to go to the hospital in time for early and standardized treatment.