The causes of excessive urination are mainly divided into physiological and pathological causes. In a normal person, when the amount of fluid intake is basically balanced, the amount of urine produced daily is not too much different. If the volume of urine exceeds 2,500 ml per day, or 24 hours, it can be called polyuria. Physiological polyuria is normal and occurs when a normal person drinks a lot of water or consumes too much food containing a lot of water. However, persistent polyuria is pathological and the cause needs to be identified and treated promptly. The main causes of pathological polyuria are endocrine diseases and kidney diseases. Endocrine diseases such as diabetes mellitus, uremia, hypokalemia, etc. can cause polyuria. Renal diseases such as polyuria in acute renal failure, early stage of chronic renal failure can also show nocturia and tubulointerstitial nephritis. Polyuria can also occur in certain specific diseases that require treatment with mannitol. If you find an increase in urine volume, you must go to the hospital in time to improve urine routine, urine sugar test, blood glucose measurement, blood liver and kidney function tests, etc., to identify the cause of polyuria and further drug or surgical treatment according to your condition. In summary, there are many reasons for polyuria, once it occurs, it is recommended to seek medical attention in a timely manner, improve the relevant tests, clarify the diagnosis and provide timely and symptomatic treatment.