Early high blood glucose but does not meet the diagnostic criteria for diabetes, after active treatment can generally return to normal, if not treated in a timely manner may develop into diabetes, it is difficult to return to normal. Early high blood glucose but does not meet the diagnostic criteria for diabetes mellitus, at this time belongs to the impaired glucose tolerance or impaired fasting blood glucose stage. Fasting blood glucose ≥3.9mmol/L but <6.1mmol/L, 2-hour postprandial blood glucose ≥7.8mmol/L but <11.1mmol/L, known as impaired glucose tolerance stage; fasting blood glucose ≥6.1mmol/L but <7.0mmol/L, 2-hour postprandial blood glucose <7.8mmol/L, known as impaired fasting blood glucose. Both stages are pre-diabetic, and blood glucose may return to normal by actively controlling diet, exercising to reduce weight, and taking hypoglycemic drug therapy. If not treated in time may develop into diabetes, then high blood sugar is difficult to return to normal. If you are not feeling well, consult a doctor.