Any type of loss of blood from a small pet is concerning and your kitten should be examined as soon as possible by a veterinarian. The first step will be trying to determine whether the blood is coming from the intestinal tract (in the feces) or urinary tract (in the urine) or both. Try to bring samples of stool from the litter box with you to your vet to help out. Intestinal bleeding may be related to infections (bacterial, parasitic, or viral), toxin ingestion, foreign bodies, trauma, or even disorders that result in problems with blood clotting. Blood in the urine may be caused by bladder or kidney infections, bladder stones, blood clotting problems,trauma, or toxin ingestion, among other things. We would be happy to see your pet and help diagnose and treat the problem. Please contact us as soon as possible and we look forward to meeting you and your kitten.