For mild to moderate hypoglycemia, it can be relieved by taking oral sugar water, sugary drinks, or eating candies, cookies, breads and buns. For drug-related hypoglycemia, relevant drugs should be discontinued in time. Patients with severe and suspected hypoglycemic coma should be given intravenous glucose promptly. The occurrence of hypoglycemia in patients with diabetes mellitus can be divided into 3 grades, grade 1 hypoglycemia: blood glucose <3.9mmol/L and ≥3.0mmol/L; grade 2 hypoglycemia: blood glucose <3.0mmol/L; grade 3 hypoglycemia: hypoglycemia without a specific glycemic threshold, accompanied by a serious event with alterations in consciousness and/or somatic changes, and requiring the help of others. There are more causes of hypoglycemia, such as insulinoma, drug factors, etc. Patients with hypoglycemia should go to the hospital in time, and follow the doctor’s instructions for treatment after a clear diagnosis by a professional physician.