Hypoglycemia, commonly known as hypoglycemia, is generally defined as fasting blood glucose concentration <2.8 mmol/L. If a diabetic patient has blood glucose ≤3.9 mmol/L, it can be judged as hypoglycemia. Hypoglycemia is often caused by various factors such as hunger, improper use of hypoglycemic drugs, insulinoma, islet cell hyperplasia, and strenuous exercise, etc. The main clinical symptoms are: 1. Sympathetic excitation symptoms: Patients may show symptoms such as panic, trembling, pale face, cold sweat, etc., accompanied by hunger, and may also show symptoms such as inattention, agitation, abdominal pain, dizziness, etc. At this time, the patient should immediately eat food containing sugar, such as drinking glucose water, honey water, eating small snacks, small cookies, etc., which can quickly relieve the symptoms of hypoglycemia; 2. Central nervous system symptoms: the patient may show hypoglycemic coma, and when hypoglycemic coma occurs, the patient should be immediately transferred to the hospital for treatment. Intravenous input of glucose, adrenal corticosteroids and other drugs as prescribed by the doctor. Since the patient is in a coma and not clearly conscious, do not force feed the patient with sugary food to avoid choking and choking, which may endanger the patient's life. To sum up, if patients have the above clinical symptoms, especially diabetic patients, they should monitor their blood glucose in time, and if the blood glucose is abnormal, they should take timely measures to keep the blood glucose within the normal range. The incidence of cardiovascular diseases caused by hypoglycemia in diabetic patients is about four times higher than that in the case of hyperglycemia, which shows that the risk generated by hypoglycemia is more serious than that of hyperglycemia. In addition, after the hypoglycemia is corrected, it is important to find out the cause of the patient's hypoglycemia to minimize the episodes of hypoglycemia.