The most typical symptom of hyperglycemia is "more than three and less", that is, more urine, more drink, more food, and weight loss. This is because hyperglycemia causes the increase of glucose content in the urine of patients, and osmotic diuresis takes away water in the body, so polyuria and dry mouth appear. As hyperglycemia can not be used to provide energy in time, the body will turn to fat decomposition, which will lead to increased eating and weight loss. In addition to the typical "more than three, less" symptoms, some patients will also have atypical symptoms, such as fatigue of both lower limbs, blurred vision, skin itching, female comrades repeatedly appear urinary tract infection, vaginitis.
