When low blood glucose occurs, the most important thing is to correct it in time and replenish blood glucose, such as drinking sugar water and eating sugar cubes. Firstly, we need to measure blood glucose, usually we measure peripheral blood glucose, this method is faster, but not as accurate as intravenous plasma glucose, so when blood glucose is too low, we need to measure peripheral blood glucose and take intravenous blood to test intravenous blood glucose at the same time, secondly, we need to judge whether it is hypoglycemia according to the measured blood glucose, generally speaking, for normal healthy adults, when the blood glucose value is lower than 2.8 mmol/L, and for For diabetic patients, hypoglycemia can be diagnosed when the blood glucose value is lower than 3.9mmol/L. If hypoglycemia occurs, it should be corrected in time, such as eating sugary food such as sugar water, candy, cookies, bread or sugary drinks, etc. If the symptoms are serious or there is consciousness disorder or even coma, it should be sent to hospital immediately for treatment, If it is a non-diabetic patient, we should exclude hunger, alcohol and other causes, and we should exclude some diseases such as insulinoma, autoimmune hypoglycemia, liver failure, renal insufficiency and malignant tumor. In case of diabetic patients, we need to clarify whether it is caused by the dosage of hypoglycemic drugs or improper use of insulin. Therefore, we should monitor blood glucose when it is low, and find the cause of hypoglycemia and then remove the cause of hypoglycemia in time to prevent the recurrence of hypoglycemia or serious hypoglycemia.