Blood glucose 7.5 mmol/L may not be diabetes. First of all, we need to clarify whether blood sugar 7.5mmol/L refers to fasting blood sugar or postprandial blood sugar, or random blood sugar. If the fasting blood glucose is 7.5mmol/L, then it may be diabetes. We need to further check whether the blood glucose two hours after meal is greater than or equal to 11.1mmol/L and whether the glycosylated hemoglobin is greater than 6.5%, and ask the patient whether there are three more and one less symptoms of diabetes to confirm the diagnosis of diabetes. If the blood glucose is after meal, especially two hours after meal, or random blood glucose, then it may not be diabetes, because the diagnosis of diabetes is two hours after meal and random blood glucose should be greater than or equal to 11.1mmol/L. Secondly, if the blood glucose 7.5mmol/L is measured under what circumstances, because many physiological reasons, drugs or some special diseases can lead to the increase of blood glucose, such as whether the blood glucose is increased due to excessive eating, emotional changes, cold and heat stimulation, trauma, infection and surgery and other stressful conditions, whether the diuretics furosemide, hydrochlorothiazide, glucocorticoids prednisone, methylprednisolone The increase of blood glucose is caused by the diuretics furosemide, hydrochlorothiazide, glucocorticoids prednisone, methylprednisolone, etc., psycho-neurological drugs such as olanzapine, and some special diseases such as liver function damage, islet cell tumor and cortisolism may also cause the transient increase of blood glucose. Therefore, the diagnosis of diabetes mellitus can only be made after excluding some other causes of transient blood glucose elevation, such as fasting blood glucose 7.5mmol/L, combined with whether the blood glucose two hours after meal is greater than or equal to 11.1mmol/L, twice at different times, and glycosylated hemoglobin greater than 6.5%, and whether the patient has the symptoms of diabetes mellitus of three more and one less.