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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.
Causes of Frequent Urination in Men. There are many causes of frequent urination in men, ranging from a kidney problem to a prostate problem. If there is a problem anywhere in the urinary tract, it may lead to frequent urination. The urinary tract include the kidneys, the ureters (or the tubes connecting kidney to bladder), the bladder, and the urethra (tube that urine flows through from bladder).