Diabetic polyuria is caused by osmotic diuresis following elevated blood glucose, which is not a good thing. The typical symptoms of diabetes mellitus are described as “three more and one less”, i.e. polyuria, polydipsia, polyphagia and weight loss. This is because when blood glucose rises, the concentration of renal tubular fluid rises, causing an increase in urine output due to osmotic diuresis, which in turn causes an increase in thirst and water intake. Polyuria is one of the symptoms of diabetes and is not a good thing. Patients with diabetes mellitus often experience hunger and polyphagia due to impaired utilization of glucose in peripheral tissues, resulting in increased breakdown of fats, negative nitrogen balance in protein metabolism, and gradual weight loss, among other things. If symptoms such as excessive eating, drinking, urinating and weight loss occur, please go to the hospital in time.