Hypoglycemia mainly refers to the decrease of glucose content in the blood, the value of diabetic patients is lower than 3.9mmol/l, and the value of normal people is lower than 2.8mmol/l. The reasons for the corresponding situation mainly include malnutrition, pancreatic islet cell tumors, the dosage of drugs, and mental stress. 1. Malnutrition: prolonged malnutrition and decreased metabolism will reduce the amount of glucose into the blood, leading to hypoglycemia. 2. Islet cell tumor: Islet cell tumor itself will secrete a large amount of insulin, resulting in a large amount of blood glucose consumption, leading to hypoglycemia. 3. High dosage of drugs: Applying hypoglycemic drugs, such as metformin or insulin, the dosage of drugs is too large which will lead to the decrease of blood glucose level and lead to hypoglycemia. 4. Mental stress: Excessive mental stress leads to an increase in vagus nerve excitability, which also leads to an increase in insulin secretion, further leading to hypoglycemia. Hypoglycemia is often accompanied by symptoms such as panic, sweating, shortness of breath, etc. It is necessary to consult a doctor in time for observation, and after confirming the diagnosis of the condition, standardized treatment will be carried out under the guidance of clinicians.