Most people with high blood glucose can return to normal with early intervention or timely treatment. Normal fasting blood glucose value of 3.9-6.1 mmol/L, oral glucose tolerance test 2-hour blood glucose is less than 7.8 mmol/L. Fasting blood glucose ≥ 7.0 mmol/L, or 2 hours after the sugar load blood glucose ≥ 11.1 mmol / L, or random blood glucose ≥ 11.1 mmol / L, or glycated hemoglobin ≥ 6.5%, accompanied by the symptoms of the three more than a few (more drink, more food, polyuria, and weight loss), a diagnosis of diabetes may be considered. Blood glucose that is higher than normal but does not meet the criteria for diabetes is considered pre-diabetic and can be returned to normal through active dietary control and exercise therapy, and medication if necessary. Those with high blood glucose should seek prompt medical attention and treatment under the guidance of a doctor.