Polyuria generally refers to urine output of more than 2,500 ml in 24 h. Under normal circumstances, the amount of urine will also increase if you drink too much water. For example, if you drink a lot of water over a period of time or eat foods that contain a lot of water, this is physiological polyuria. In the case of prolonged polyuria, it is important to consider whether it is caused by pathological factors. Common causes of polyuria include uremia and diabetes mellitus. In addition, polyuria can also occur in the early stages of renal insufficiency. Patients with acute renal failure will experience polyuria during the recovery process, with urine volume reaching 4,000 to 5,000 ml. urolithiasis is a neurological disorder caused by pituitary lesions, which generally manifests as easy thirst and weakness, and despite insufficient water intake, they will still urinate a lot, not paying attention to hydration will easily cause electrolyte disorders, and will also be accompanied by headaches and other symptoms. Diabetes mellitus, also known as achalasia in the past, increases urine output compared to normal because of the osmotic diuretic effect, and in addition, there is also a wasting condition. In summary, excessive urination can be physiological, but we should be alert to the occurrence of disease. Once there is an unexplained increase in urine volume, it is recommended to seek medical attention in a timely manner to investigate related diseases.