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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 prostate gland is the size of a walnut. It is found in front of the rectum and just below the bladder, which stores urine. The prostate makes some of the milky fluid (semen) that carries sperm. The prostate wraps around a tube (the urethra) that carries urine from the bladder out through the tip of the penis. During a man's orgasm (sexual climax), muscles squeeze the prostate's fluid into the urethra. Sperm, which are made in the testicles, also go into the urethra during orgasm. The milky fluid carries the sperm through the penis during orgasm.