The causes of hypoglycemia include physiological factors, drug factors and pathological factors. 1. Physiological factors: insufficient food intake, such as excessive dieting, excessive exercise without timely food supplementation, can cause hypoglycemia. 2. Pharmacological factors: hypoglycemia can occur easily when the dose is too large during the treatment of insulin stimulant or insulin hypoglycemia. 4. Pathological factors: for example, patients after major gastrectomy will have dumping syndrome after eating, causing postprandial hypoglycemia, and excessive insulin secretion from insulinoma can lead to frequent hypoglycemia. If patients have frequent hypoglycemia, they should consult the doctor in time, complete the relevant examination, identify the cause of the disease, and carry out treatment under the guidance of the doctor.