The need for glucose-lowering medication for a blood sugar of 7.8 mmol/L needs to be considered in the context of the patient’s specific symptoms and the timing of the blood sugar test. If 7.8mmol/L is a random blood glucose, it belongs to the normal range. If 7.8mmol/L is fasting or 2 hours after meal, then it is high blood glucose, it is recommended to go to the hospital for further glucose tolerance test to clarify whether there is diabetes or not. Under normal circumstances, fasting blood glucose value of 3.9-6.1mmol / L; 1 hour after the meal corresponds to the blood glucose value of 6.7-9.4mmol / L, up to 11.1mmol / L; 2 hours after the meal blood glucose value of <7.8mmol / L; 3 hours after the meal corresponds to the blood glucose value of 3.9-6.1mmol / L. If the patient has typical diabetes "diabetic", then it is recommended to go to the hospital for further testing of glucose tolerance test to determine whether there is diabetes. If the patient has the typical diabetes "three more and one less" symptoms (drinking more, urinating more, eating more, weight loss), and the value is fasting blood sugar, then the diagnosis of diabetes mellitus can be made, and it is recommended to control the diet and exercise under the guidance of the physician, and control the blood glucose with glucose-lowering drugs such as metformin, sulfonylureas (glibenclamide), or insulin, and so on. Blood glucose 7.8mmol/L is recommended to test blood glucose several times, or further glucose tolerance test to clarify whether there is elevated blood glucose. If there is any discomfort, consult the doctor promptly.