Postprandial low blood glucose may be caused by irrational diet, drugs, postprandial reactive hypoglycemia and other factors. 1. Lifestyle: Eating less or eating less carbohydrates, exercising a lot after meals may consume too much glucose, resulting in low blood glucose after meals. 2. Drugs: When using certain hypoglycemic drugs or insulin, the drugs work fast and the dosage is large, which may also lead to postprandial hypoglycemia. 3. Postprandial reactive hypoglycemia: It is a phenomenon in the early stage of type 2 diabetes mellitus, in which the peak of insulin in the blood is delayed, leading to postprandial hypoglycemic reaction. It is recommended that patients with postprandial hypoglycemia should go to regular hospitals, complete the relevant examinations, and standardize the treatment under the guidance of doctors.