Urine left in the bladder after a person has passed as much urine as possible.
Urine left in the bladder after urination, an abnormal occurrence that may accompany enlargement of the prostate.
Urine that stays in the bladder post-voiding is typically caused by a blockage at the exit point. In men, this retention can be attributed to an enlarged prostate, while in women, it may result from a prolapsed bladder into the vagina, often a consequence of the vaginal stretching that occurs during childbirth.