Oliguria refers to the amount of urine in 24 hours.

Oliguria in clinical refers to 24 hours of urine volume less than 400mL, or urine volume per hour for less than 17mL. Normal patients in 24 hours of urine volume is about 1000-2000mL, showing oliguria, first consider physiological factors, if the patient drinks less, in hot summer and after strenuous exercise, the body's water evaporation through sweat, will cause decreased urine volume. After excluding physiological factors, considering the influence of pathological factors, it is mostly caused by prerenal, postrenal and renal diseases. Most common diseases include glomerulonephritis, chronic nephritis, urinary tract obstruction, prostatic hyperplasia, renal insufficiency, hemorrhagic shock, etc., which need timely treatment. And in daily life, drink more water and urinate more, which is not only conducive to maintaining the health of the urinary system, but also can discharge the metabolic waste in the body in time, which is conducive to maintaining internal balance.