Low blood glucose may be diabetes, which can be determined by monitoring blood glucose changes, improving glucose tolerance and other related tests. It may also be caused by other factors. For patients with diabetes mellitus or pre-diabetes mellitus, there will be abnormal insulin secretion in the body, and insulin secretion is delayed after meals, which may result in inappropriate insulin peaks before the next meal, leading to preprandial low blood glucose. It is recommended to improve glucose tolerance, glycated hemoglobin and other related tests to clarify the diagnosis. In addition, low blood glucose may also be caused by insufficient energy intake and increased consumption. Disease factors such as insulinoma, autoimmune hypoglycemia, and liver disease may also lead to low blood glucose. If you have low blood glucose or suspect diabetes, it is recommended that you seek prompt medical attention.