Most diabetic patients do not have any performance in the early stage, through physical examination or unintentional blood glucose measurement, found that the original high blood sugar, to the hospital, diabetes mellitus special refers to the following: 1, the typical characteristics of diabetes mellitus is three more and one less, that is, more drinking, more food, more urine, weight loss, if there have been three more and one less, indicating that blood sugar has been higher or has been high for a period of time, if there are these performances, more timely to 2, some diabetic people do not have three more and one less, because of sudden infection or trauma always can not get well, the surgeon change medicine many times the wound does not heal, or recently see things blurred, some women’s gynecological inflammation cure and repeated, if there are these cases, it is recommended to timely blood sugar testing. All of the above are caused by diabetic comorbidity or diabetic complications, and not everyone has three more and one less. We hope that patients know these manifestations of diabetes and have their blood glucose tested in time.