Why drink so much water and urinate so little?

Why drink more water and less urine, need to be based on the specific situation of drinking water and urine. Clinically, oliguria caused by renal function damage refers to less than 400ml of urine in 24 hours, and anuria refers to less than 100ml of urine in 24 hours. If you drink more water and the daily urine volume is less than 400ml, it indicates that kidney damage occurs. Further examination or further treatment is needed to restore the function of kidney damage. When drinking water and urine volume is small, you need to calculate yourself, how many milliliters of water is the daily amount, how many milliliters of urine. Normal people drink water and output is a state of dynamic balance. Output not only includes urine volume, but also includes defecation, sweat volume, etc. If the daily water consumption is 2000ml, but the patient has diarrhea, the amount of water excreted through diarrhea is about 1000ml, which is also a state of dynamic balance. If the patient is hot and sweats more, drinking 2000ml, urinating 1000ml, but sweating about 1000-1200ml, this also belongs to a dynamic balance process, which is not a pathological change. Unless the 24-hour urine volume is less than 400ml, it is considered that the kidney is damaged to a certain extent and oliguria. You can calculate your own drinking water and urine volume, sweat volume, defecation volume, etc., and comprehensively judge whether pathological changes occur. If you can't make a clear judgment, it is recommended to go to the hospital to ask a professional doctor for detailed examination and consultation to judge whether there is pathological damage.