Glycated hemoglobin is normal but blood sugar is still high if it is a normal person need to clarify the diagnosis, and if it is diabetes need to increase or change the medication to control blood sugar. 1. Normal people: if there is a high sugar diet, emotional excitement, short-term strenuous exercise, etc., it is possible that blood glucose will rise temporarily, and glycated hemoglobin is normal; if there are infections, fever, angina pectoris, cardiac infarction, etc., it is also possible that stress blood glucose increases, and glycated hemoglobin is normal. It is recommended to retest the blood glucose after removing the triggers, if the blood glucose is still high, it is recommended to further improve the glucose tolerance test to clarify the diagnosis. 2. Patients with diabetes mellitus: Since glycosylated hemoglobin reflects the average blood glucose in the last 8~12 weeks, if the patient’s blood glucose fluctuates greatly, alternating between hyperglycemia and hypoglycemia, high blood glucose and normal glycosylated hemoglobin can occur, it is recommended to adjust the glucose-lowering program. If the patient does not pay attention to dietary control, and occasional elevation of blood glucose, it can be manifested as normal glycosylated hemoglobin, there is no need to panic, and it is recommended to pay attention to dietary control and monitoring of blood glucose. Glycated hemoglobin indicates the control of blood glucose in the past 8~12 weeks, but cannot reflect the instantaneous blood glucose level and fluctuations, so if blood glucose is still high despite normal glycated hemoglobin, it is recommended to consult a doctor immediately to make a clear diagnosis after eliminating possible triggers.