Glycosylated hemoglobin 6.3 is high and should be treated promptly. Glycosylated hemoglobin is mainly used to monitor the blood sugar level of diabetic patients in the past 2-3 weeks, and under normal circumstances the concentration of glycosylated hemoglobin should be between 4-6. 6.3 is high, and individuals should adjust their dietary habits and exercise appropriately to improve the symptoms of high blood sugar. The diagnosis and treatment should be carried out in hospital, and the medication should be adjusted to avoid fluctuations in blood sugar as much as possible. Long-term high glycosylated hemoglobin is prone to complications of diabetes, such as diabetic ketoacidosis, which can easily lead to coma and drowsiness, and can affect the normal pumping function of the heart in serious cases, requiring timely medical intervention. While monitoring glycosylated hemoglobin, postprandial glucose levels should be measured for a comprehensive evaluation.