The diagnosis of diabetes mellitus is based on the typical symptoms of “three more and one less” (excessive drinking, excessive urination, excessive eating, and weight loss) plus intravenous plasma glucose ≥11.1 mmol/L at any time of the day, fasting glucose ≥7.0 mmol/L, or glucose ≥11.1 mmol/L 2 hours after a glucose tolerance test, which can be diagnosed as diabetes mellitus if one of them is met. A diagnosis of diabetes mellitus is made when one of them is met. Diabetes mellitus is a group of metabolic disorders characterized by chronic hyperglycemia due to multiple etiologies and is caused by defects in insulin secretion and/or utilization. Once elevated blood glucose levels are detected, you should go to the endocrinology department of a regular hospital for consultation and treatment under the guidance of a professional doctor to avoid delaying your condition.