High blood sugar can be discussed from two aspects. On one hand, the blood sugar is high enough to meet the diagnostic criteria for diabetes. On the other hand, the blood sugar is slightly elevated, not reaching the diagnostic criteria for diabetes but still higher than normal blood sugar. In this case, a glucose tolerance test is needed. Some patients with impaired glucose tolerance will progress to diabetes. After a diagnosis of diabetes, certain treatment methods are required. 1. Diabetes education: Patients should be fully aware of diabetes and understand its progression. 2. Diet control: Only by effectively controlling the diet can blood sugar be kept as close to the target as possible. 3. Exercise therapy: Diabetic patients need to engage in a certain amount of physical activity, which helps the body absorb blood sugar. 4. Medication therapy: Medication therapy includes oral hypoglycemic drugs and insulin treatment. 5. Regular blood sugar monitoring: Monitoring blood sugar is of great guiding significance for the medication of diabetic patients. These are the five basic principles of diabetes treatment.