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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.
Blood in the Urine in Men. Blood in the urine can be quite alarming, but keep in mind that it's unusual for men to bleed large amounts through the urine. Even a small drop of blood can turn an entire toilet bowl of water bright red. However, large blood clots can be dangerous because they can block the flow of urine. They can also cause a fair amount of discomfort as they pass out of the bladder. In general, any blood clot that's bigger than the tip of your little finger would be considered to be large.