Have Cat Questions? Ask a Cat Vet Online.
Hi there, I'm Dr. Sara. I'm a licensed veterinarian who works exclusively with cats and dogs. I'm sorry to hear that your kitty hasn't been feeling well. Blood and mucus coming from the rectum is frequently just a bad case of diarrhea. This can be caused by a variety of diseases in young cats like GI parasites, infectious viruses, protozoal diseases, or dietary indiscretions. Sometimes these will resolve on their own, but other times they need medication to treat the underlying cause. In the mean time, do allow him to eat - he needs something to make more feces with. You can also try a bland diet, which is thee parts boiled white rice mixed with one part boiled white chicken breast - as this can help firm up stools. Since he is young and parasitic diseases are more common, I would have a vet check a fecal exam to see if they can uncover and treat the main issue.
Please let me know what questions I can answer for you.