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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.
Abnormal urine flow can set the stage for a number of problems. 1  Infection. Normally, urine flow washes out bacteria and keeps them from growing in the kidneys and urinary tract. 2  Stones. Urinary stones form from substances found in the urine, such as calcium and oxalate. 3  Kidney failure.