Regardless of whether there are usually symptoms or not, elevated blood glucose in body checkups must be done with an oral glucose tolerance test to determine if diabetes is really present. Once the venous blood glucose fasting >7mmol/L (finger glucose does not count) or 2 hours after meal >11.1mmol/L, all diagnose diabetes. After the diagnosis of diabetes, the glycosylated hemoglobin result will be looked at. If the glycosylated hemoglobin is below 7% and there is no symptom, you can control the diet (strictly controlled by diabetic diet) and increase the amount of exercise first, and then review the glycosylated hemoglobin after 3 months. If it is between 6.5% and 7% you can use medication, if it is above 7% then you must start treatment. This means that any time the glycosylated hemoglobin is checked above 7% it is recommended to start treatment immediately. If the fasting blood sugar of the glucose tolerance test is between 5.6-7mmol/L and the 2 hours after meal is between 7.8-11.1mmol/L, diabetes can not be diagnosed, but it is abnormal glucose tolerance, which means that you have a great possibility to develop diabetes within 5 years, so you should not take it lightly, and at this time you should start to control your diet and strengthen your exercise. If you are overweight or have a large stomach, you should lose weight immediately. You should also review your glucose tolerance test at least once a year. Once you have developed diabetes, you need to deal with it actively.