The reason why the blood sugar rises instead of fasting hunger may be hypoglycemia, irregular hypoglycemic treatment and so on. 1. Hypoglycemia: hypoglycemia can occur when people are overly hungry, and there can be a clear feeling of hunger, while the body in order to alleviate hypoglycemia, compensatory secretion of glucagon and other glucose-raising hormones, and severe starvation can be fat, protein breakdown into glucose, resulting in elevated blood glucose. 2. Irregular hypoglycemic treatment: If the hypoglycemic treatment is not standardized, the diet and exercise control is not good, the blood glucose control is poor, the glucose in the body can not be transferred to the cell for energy metabolism, and there can be a feeling of hunger, and the performance of eating more. Generally can be adjusted under the guidance of the doctor glucose-lowering drugs, reasonable diet and exercise, the patient’s blood sugar control standards, hunger can be gradually alleviated. Fasting hunger blood sugar instead of rising to the hospital to find out the cause, follow the doctor’s instructions for treatment.