Sudden increase in urine output may be caused by drinking a lot of water, recovery from glomerulonephritis, diabetes mellitus, uremia and other conditions. 1. Drinking a lot of water: If you drink a lot of water in a short period of time, resulting in more blood circulation filtered through the kidneys, the kidneys will excrete more water, and a sudden increase in urine output will occur. 2. Recovery of glomerulonephritis: patients with glomerulonephritis have more urine volume and less foam in urine during the recovery period, while the edema subsides to prove that the patients are recovering, which is a normal phenomenon. 3. Diabetes: diabetic patients contain more sugar in the urine, which will increase the osmotic pressure in the urine, and further promote the leakage of water increased. At this point should be alerted is not suffering from diabetes. 4. Uremia: Uremia due to hypothalamic pituitary disease, caused by the lack of antidiuretic hormone leads to the renal tubular reabsorption of water dysfunction, thus causing a sudden increase in the amount of urine. If you find a sudden increase in the amount of urine, you should go to the hospital in a timely manner, conduct relevant examinations, and follow the doctor’s instructions to standardize the treatment.