The main reason for diabetes patients to have polyuria and polyuria is that after the blood sugar rises, polyuria is caused by osmotic diuresis, and then polyuria is caused by thirst, so many patients will have dry mouth, polyuria and polyuria. Diabetes is a group of metabolic diseases characterized by chronic hyperglycemia caused by multiple causes. It is caused by deficiencies in insulin secretion and/or utilization. Long term carbohydrate, fat and protein metabolism disorders can cause multiple system damage, leading to chronic progressive disease, dysfunction and failure of eyes, kidneys, nerves, heart, blood vessels and other tissues and organs, Severe illness or stress can cause acute severe metabolic disorder, such as diabetic ketoacidosis, hypertonic hyperglycemia syndrome.