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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 enlargement of the prostate is not uncommon in men, which may cause later problems when urinating, as the prostate then places pressure on the urethra, which is the tube that carries the flow of urine from the bladder, through the prostate.