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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 male urethra is a tubular structure about. in length, originating in the bladder, at the inferior and anterior level, and after crossing the pelvic floor and the perineum, it runs along the entire length of the penis, ending at the apex of the gland.