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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.
Once a man's bladder is full, the urethra carries urine to the penis and out the meatus, which is located at the tip of the penis. The male urethra also carries semen and sperm out of the body during sexual acts. The male urethra is much longer than that of the female.