In general, the normal range of blood glucose for a normal person is: the normal range of fasting blood glucose is 3.9 to 6.1 mmol/L, and the 2-hour postprandial blood glucose value is 7.8 mmol/L or less. Elevated blood glucose levels can occur when suffering from diabetes mellitus, a group of metabolic diseases characterized by chronic hyperglycemia caused by multiple etiologies and resulting from defective insulin secretion and/or utilization. In addition, elevated blood glucose levels can occur in cases of infection and stress. In daily life, attention should be paid to diet, avoiding long-term intake of large quantities of greasy food and food with high sugar content, so as not to cause obesity and induce diabetes. In addition, pay attention to proper exercise. Once elevated blood glucose levels are detected, it is recommended to seek prompt medical attention to avoid delaying the condition.