High glycated hemoglobin indicates poor glycemic control, which may lead to the development of diabetic complications, including acute complications and chronic complications, if one has diabetes. 1. Acute complications: Glycated hemoglobin reflects the patient’s blood glucose control level in the past 2~3 months. High glycated hemoglobin indicates high blood glucose in the near future, which may lead to acute complications such as diabetic ketoacidosis, hyperosmolar hyperglycemia syndrome, etc., which may be life-threatening in severe cases. 2. Chronic complications: high glycosylated hemoglobin generally suggests that the patient has diabetes or substandard glycemic control, which may induce a variety of chronic complications of diabetes, such as diabetic retinopathy, diabetic nephropathy, diabetic peripheral neuropathy, diabetic foot, and so on, which seriously threaten the patient’s health. Therefore, after the appearance of high glycosylated hemoglobin, need to consult the doctor in time, under the guidance of the doctor for treatment.