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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.
Quick Answer. Common causes of blood in men's urine include an enlarged prostate, kidney or bladder stones, and urinary tract infections, according to Mayo Clinic. Regardless of cause blood in the urine typically indicates a condition that requires a doctor's care.