Men only experience blood clots in their urine from injury or medical conditions that require treatment, making it uncommon in healthy men. Not all men who suffer from the conditions have urinary blood clots, but when clots show up, medical attention is necessary, according to University of Iowa Health Care.
If blood clots appear in a man's urine, they are a potential clue as to the underlying condition. For example, if the clots have a variety of shapes, they could indicate bleeding from the prostate or urethra. If the clots are shaped like worms, they could come from the tubes that link the kidneys and the bladder, called the ureters, as explained by University of Iowa Health Care.