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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.
The urethra in males is the tube that carries urine from the bladder to the outside of the body and also serves as the channel though which semen is ejaculated. The anterior urethra is the portion of the urethra from the tip of the penis to just before the prostate.he scar (stricture) is composed of dense collagen and fibroblasts (proteins that form cell-producing connective tissue) and thus contracts in all directions, shortening urethral length and narrowing the diameter of the urethra. Strictures usually do not cause symptoms until the urethra tube is below a certain size.