There are many factors that may cause hypoglycemia, and the more common ones in clinical practice are overuse of insulin or overdose of glucose-lowering drugs. Some patients do not eat in time or delay after subcutaneous insulin injection or oral hypoglycemic drugs, and miss the meal time. Some patients exercise too much or drink too much alcohol, especially on an empty stomach, which can cause hypoglycemia. Some patients are combined with liver and kidney insufficiency, severe liver disease or liver failure will lead to reduced liver sugar output, which will also cause hypoglycemia. Some of the diseases that cause increased insulin secretion, such as insulinoma, can also cause hypoglycemia. Hypoglycemia must be taken seriously and its triggers should be avoided as much as possible.