Fasting blood glucose is higher than postprandial blood glucose, which may be due to dawn phenomenon, reflex blood glucose elevation, insufficient medication dosage and so on. 1. Dawn phenomenon: Due to the increase of cortisol, growth hormone and other insulin antagonist hormones in the early morning, the fasting blood glucose is higher than the postprandial blood glucose in the early morning, which is called dawn phenomenon. 2. Reflexive blood glucose elevation: when the dose of hypoglycemic drugs before bedtime is large, nighttime hypoglycemia can occur, leading to a reflexive increase in blood glucose in the early morning, and the fasting blood glucose is higher than the postprandial blood glucose. 3. Insufficient drug dosage: the hypoglycemic drugs used before going to bed are insufficient to effectively reduce fasting blood glucose, resulting in higher fasting blood glucose than postprandial blood glucose. Fasting blood sugar is higher than postprandial blood sugar, it is recommended to go to the hospital in time.