If you hold urine and feel abdominal distension, it is recommended to go to the hospital for further examination to clarify the cause. 1, hold urine for too long, the normal storage of urine in the bladder is about 250-300 ml. If you hold urine for more than 4 hours, holding urine volume > 300 ml, it can cause overfilling of the bladder and cause abdominal distension and pain, you need to empty the bladder in time, the distension and pain can be relieved soon. 2, there is a history of chronic cystitis. The history of chronic cystitis, after excessive holding urine caused by chronic inflammation of the bladder further aggravated, can cause small abdominal distension and pain. This situation may last for a long time, even after emptying, it will still last for some time. 3, the case of urinary reflux occurs, the amount of urine held in the bladder is too much, pressure > 40cmH2O, urine can be through the ureter to the kidney reflux, which can cause pain in the lower abdomen, radiating to the back pain characteristics, timely emptying of the bladder after the symptoms can be reduced.