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Enlarged Prostate Symptoms and Causes. In men, urine flows from the bladder through the urethra. BPH is a benign (noncancerous) enlargement of the prostate that blocks the flow of urine through the urethra. The prostate cells gradually multiply, creating an enlargement that puts pressure on the urethra -- the chute through which urine and semen exit the body.
This ring usually keeps urine from leaking out. Men can have incontinence from problems such as overgrowth of the prostate gland or cancer of the prostate gland, both of which can block the flow of urine. In these cases, urine leaks out when the bladder becomes too full.