Urine outflow caused by urinary retention due to prostate enlargement occurs when the bladder is overfilled to the point where it reaches the limit of bladder capacity, causing a small amount of urine to spill out of the urethra. It is also known as filling urinary retention. Filling urinary incontinence is caused by prostate hyperplasia, the gland protrudes into the posterior urethra and bladder neck, the posterior urethra is extended, resulting in urinary difficulties, the previous development of the disease slowly, but when the obstruction aggravates to a certain extent, the gradual increase in the residual urine, the occurrence of chronic urinary retention resulting in filling urinary incontinence. At this time, the patient can not urinate, the bladder is distended, and the pain in the lower abdomen is unbearable. The bladder has reached its capacity limit, and a small amount of urine overflows from the urethra. Urgent catheterization should be required to relieve the symptoms of urinary retention. However, the fundamental solution to this condition should be to solve the cause of prostate hyperplasia, which can be treated by medication or surgery as well as other ways, if the condition is serious you should go to the hospital as soon as possible.