A normal person urinates about 1000-1500 ml per day in 24 hours, if the amount of water consumed is high then the amount of urination may increase further, if less water is consumed then the amount of urine may decrease moderately. The volume of each urination is about 150-250ml, depending on the length of time of holding the urine, if the patient has held the urine for a long time, a single urination may be more than 300ml or more. If there is a significant decrease or increase in the total amount of urine throughout the day may suffer from urolithiasis or suffer from renal function abnormalities, etc., which leads to the production of more urine or less urine, etc., need to go to the hospital for kidney function, urine and other related laboratory tests to determine. If the urine volume is less than 150 ml without holding the urine, it is mostly due to over-sensitivity of the bladder, and if it is less than 100 ml, it is mostly due to the presence of urinary tract infections or prostate hyperplasia, urinary stones and other stimuli that cause the urine volume to be too low, and it needs to be examined in order to confirm the diagnosis.