Recently, a patient in the clinic reported that his blood sugar was always poorly controlled, his fasting blood sugar was high, and he increased his insulin dosage at night, but his blood sugar would be higher the next morning. When we asked the patient carefully, we learned that the patient would sometimes add meals at night before going to bed, and if he did not add meals, he would wake up hungry at night. This is actually the occurrence of nocturnal hypoglycemia, which is caused by excessive insulin dosage at night, and the insulin dosage should be reduced, not increased. Some patients do not understand, but just increase their diet, the more they add meals, the higher the blood sugar in the morning, the higher the blood sugar, the more the insulin dosage is increased, and the more insulin is used, the more hunger (hypoglycemia) phenomenon occurs. This forms a vicious circle, which will not only make the patient gain weight, high blood sugar, and easy to appear malignant hypoglycemia, resulting in serious consequences. Therefore, if insulin treatment patients have elevated fasting blood glucose, they should consult their doctors and analyze the causes comprehensively, and should not blindly increase insulin dosage by themselves. Wei Jing, Endocrine Specialist, Jinan Hospital of Traditional Chinese Medicine