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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.
Male urinary system and prostate: The prostate makes some of the milky fluid (semen) that carries sperm. The gland is the size of a walnut and is found just below the bladder, which stores urine. The prostate wraps around a tube (the urethra) that carries urine from the bladder out through the tip of the penis.