# Blood in Cat Poop: Causes, Urgency, and What to Do Blood in cat poop means something is irritating or injuring the lining of your cat's digestive tract, and it can range from a mild, treatable bout of colitis to serious internal bleeding. The color and amount of blood, plus how your cat is acting, tell you a lot about how urgent the problem is. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - A few streaks of bright red blood on otherwise normal poop, with a cat that is eating and acting normal, usually means irritation in the lower bowel and can wait for a routine vet visit. - Large amounts of blood, black tarry stool, or blood clots mean bleeding higher up or heavy bleeding, and your cat needs to be seen the same day or immediately. - Any blood in poop combined with vomiting, weakness, pale gums, pain, or a cat that will not eat is an emergency. - Do not give human medications, and do not withhold food unless your vet tells you to. - Take a photo of the stool and note the color, amount, and how many times it happened before you call the vet. ## What Blood in Cat Poop Looks Like and What Is Normal Normal cat stool is firm, brown, and log shaped. It should not contain blood, mucus, or a black tar-like coating. Blood can show up in a few different ways, and each one points to a different part of the gut: - **Bright red streaks or drops on the surface.** This is fresh blood from the lower bowel or rectum. It often comes with straining or frequent small poops. - **Blood mixed through soft or watery stool.** This usually means inflammation in the colon or the last part of the small intestine. - **Black, tarry, sticky stool (melena).** This is digested blood from higher up in the stomach or small intestine. It is a more serious sign than bright red streaks. - **Blood clots.** A clot in the poop suggests a larger bleed or a mass that is bleeding. This needs prompt veterinary care. - **Mucus with blood.** Mucus looks like clear or whitish jelly. Mucus plus blood often points to large bowel inflammation. A single small streak in an otherwise healthy cat is not automatically an emergency, but it is never normal. It is a signal to watch closely and call your vet. ## Causes of Blood in Cat Poop Many conditions cause blood in cat stool. Some are mild and short lived. Others are serious and get worse quickly. The table below groups the most common causes by what you are likely to see and how fast you need to act. | Cause | Typical clues | How urgent | |---|---|---| | Bacterial infection (Campylobacter, Salmonella) | Watery or bile-streaked diarrhea with or without blood, poor appetite, belly pain, sometimes vomiting or fever [1] | See a vet within a day or two. Salmonella can cause severe blood poisoning [1] | | Inflammatory bowel disease (IBD) | Recurring vomiting and blood in stool over weeks, often in a young or middle-aged cat [2] | Routine visit soon, but sooner if the cat is losing weight or not eating | | Intestinal mass or tumor | Recurrent vomiting, black stool, weight loss, often in an older cat [3] | Same day. Bleeding from a tumor can be hard to control [3] | | Trauma or bleeding disorder | Recent accident or injury, bruising, weakness, collapse [4] | Emergency now | | Chronic diarrhea conditions | Soft stool lasting more than 2 to 3 weeks, with or without visible blood [5] | Routine visit, sooner if the cat is losing weight | | Parasites, food upset, or stress colitis | Sudden soft stool with fresh blood, cat still bright and eating | Routine visit, same day if it keeps happening | ### Bacterial Infections Bacteria such as Campylobacter and Salmonella can inflame the gut and cause diarrhea that contains blood. Signs often include mucus-laden, watery, or bile-streaked diarrhea that lasts 5 to 15 days, along with reduced appetite, belly pain, and sometimes vomiting or fever [1]. The diarrhea tends to be most severe in cats under 6 months old [1]. Some cats carry Salmonella without any signs at all and can pass it to other pets or people, so hygiene matters [1]. ### Inflammatory Bowel Disease IBD is a common cause of ongoing gut signs in cats. It causes recurring vomiting and blood in the stool, and it is confirmed with biopsy showing intestinal inflammation [2]. One reported case involved a 9-month-old cat with a 5-week history of vomiting and blood in the stool, and the signs came back when treatment stopped [2]. This pattern of improvement and relapse is typical, and it usually needs long-term management. ### Tumors and Masses Growths in the intestine can bleed. A duodenal carcinoid, a type of tumor, caused repeated vomiting of blood and black stool in a 15-year-old cat, and the bleeding could not be fully controlled even with surgery [3]. Older cats with black stool, weight loss, or repeated vomiting need imaging and testing quickly. ### Trauma and Bleeding Disorders Injury can cause internal bleeding that shows up in the stool. A kitten trapped in a washing machine for 30 minutes developed shock, breathing trouble, low body temperature, and a clotting problem called coagulopathy [4]. Trauma cases like this need emergency care, and bleeding into the gut is one possible result. ### Chronic Diarrhea Chronic diarrhea is a common sign in cats and has many causes. It can be classified as small bowel or large bowel diarrhea based on the signs, and the mechanisms include problems with fluid movement, a leaky intestinal barrier, and abnormal gut motility [5]. Long-term food management is part of treatment for most of these cats [5]. If your cat has loose stool with blood, our guide on [Cat Diarrhea with Blood: Urgency and Next Steps](/knowledge/veterinary-medicine/vet-visit-decisions/cat-diarrhea-with-blood) walks through what to do first. If you also see jelly-like mucus, see [Cat Diarrhea with Blood and Mucus: Causes and When to Act Fast](/knowledge/veterinary-medicine/digestive-and-urinary-care/cat-diarrhea-blood-mucus-causes). ## Red Flags That Make It an Emergency Some signs mean you should stop reading and call an emergency clinic now. - **Large volume of blood** in the stool, in the litter box, or on your cat's rear end. - **Black, tarry stool.** This is digested blood and points to bleeding higher in the gut. - **Blood clots** in the poop. - **Pale or white gums.** This can mean serious blood loss. - **Weakness, collapse, or trouble breathing.** - **Vomiting blood or vomiting repeatedly.** - **A cat that will not eat or drink** for more than 12 to 24 hours. - **Pain when you touch the belly**, or a hunched, hiding posture. - **Known or suspected trauma**, such as a fall, a car accident, or being trapped in an appliance [4]. - **Blood in stool in a kitten under 6 months old.** Diarrhea from bacterial infection tends to be most severe in this age group [1]. Any one of these signs means go now. Do not wait to see if it improves overnight. ## What You Can Safely Do at Home While You Wait Home care is about collecting information and keeping your cat comfortable. It is not about treating the bleeding yourself. - **Take a photo of the stool.** Include something for scale, like a coin or a ruler. Vets can learn a lot from a clear picture. - **Note the details.** Write down the color (bright red, dark red, black), the amount, whether it was mixed in or on the surface, and whether you saw mucus or a clot. - **Track the pattern.** How many times has it happened? Was the stool soft, watery, or formed? - **Check the gums.** Normal gums are pink. Pale, white, or gray gums are a reason to call right away. - **Offer water.** Keep fresh water available. Do not let your cat get dehydrated. - **Do not give human medications.** Never give pain relievers, anti-diarrheal drugs, or antibiotics meant for people. Some are toxic to cats. - **Do not fast your cat** unless your vet specifically tells you to. - **Keep other pets and people away from the stool.** Some causes, like Salmonella, can spread to others [1]. - **Wash your hands** after cleaning the litter box. If your cat is bright, eating, and has only a small streak of blood, you can call your vet for advice during normal hours. If any red flag is present, skip the wait and go in. ## What Your Veterinarian Will Check and Test Your vet will start with a full physical exam, including belly palpation and a check of your cat's gums, hydration, and body condition. Expect questions about diet, recent changes, possible foreign objects, other pets, and whether your cat goes outside. Common tests include: - **Fecal testing.** For suspected campylobacteriosis, the vet tests the feces for evidence of infection [1]. Fecal tests also look for parasites. - **Blood work.** A complete blood count and chemistry panel check for anemia, infection, and organ problems. In one IBD case, a cat had high eosinophil and basophil counts that returned to normal after treatment [2]. - **Imaging.** Ultrasound or CT can find masses, thickening, or fluid. A duodenal mass was found this way in one cat with bleeding [3]. - **Endoscopy or colonoscopy.** These let the vet look directly at the gut lining and take samples. Colonoscopy in one cat showed erosions in the cecum, and a surgical biopsy confirmed the diagnosis [2]. - **Biopsy.** This is often the only way to confirm IBD or cancer [2][3]. - **Clotting tests.** These are important after trauma or when a bleeding disorder is suspected [4]. Treatment depends on the cause. It may include fluids, antibiotics, anti-nausea drugs, steroids, a special diet, or surgery. For IBD, one cat was treated with prednisolone and two antibiotics, and the signs resolved as the antibiotics were slowly reduced [2]. Your vet will calculate every dose based on your cat's weight and health, so never use a dose from someone else's pet. ## Prevention and Monitoring You cannot prevent every cause of blood in the stool, but you can lower the risk and catch problems early. - **Keep up with parasite prevention** as your vet recommends. - **Feed a consistent, balanced diet.** Sudden diet changes can trigger gut upset. - **Introduce new foods slowly** over several days. - **Manage stress.** Changes in the home, new pets, or a move can trigger colitis in some cats. - **Watch the litter box.** You are the best early warning system. Note any change in color, shape, or frequency. - **Keep cats indoors** to reduce trauma, fights, and exposure to infected animals. - **Store food safely** and wash hands after handling raw meat, since some gut bacteria can spread between pets and people [1]. - **Schedule routine exams**, especially for older cats, so masses and chronic conditions are found sooner. For cats with ongoing diarrhea, long-term nutritional management is a core part of treatment [5]. Your vet can recommend a specific diet based on the type of diarrhea your cat has. ## Limitations and When to Contact a Veterinarian This article cannot tell you what is causing your cat's bleeding. Only a veterinarian who examines your cat can do that. Individual cases need a veterinarian, and the timing below is a guide, not a diagnosis. **Call an emergency clinic now if you see:** - A large amount of blood, blood clots, or black tarry stool - Pale gums, weakness, collapse, or trouble breathing - Vomiting blood or repeated vomiting - A cat that will not eat or drink - Belly pain or a hunched posture - Any trauma, such as a fall or being trapped in an appliance [4] - Blood in the stool of a kitten under 6 months old [1] **Call your vet the same day if you see:** - Blood in the stool more than once in 24 hours - Diarrhea with blood that lasts more than a day - Blood plus mucus, or blood plus a lot of straining - A cat that is eating less than normal or hiding more **Schedule a routine visit soon if you see:** - A single small streak of bright red blood in an otherwise healthy, normal-acting cat - Soft stool with occasional blood that comes and goes over weeks [5] - Any ongoing change in stool that lasts more than a few days If you are ever unsure, call your vet. A phone call costs nothing and can save your cat's life. ## Frequently Asked Questions ### Is a little blood in cat poop always serious? No, a small streak of bright red blood in an otherwise healthy cat is often caused by mild lower bowel irritation. That said, it is never normal, so it deserves a call to your vet and a close watch. If it happens more than once, or your cat acts sick, get an exam. ### Can stress cause blood in my cat's poop? Stress can trigger colitis, which may produce soft stool with fresh blood. This is more likely when there has been a recent change like a move, a new pet, or a diet switch. If the blood keeps showing up or your cat seems unwell, have your vet check for other causes. ### How do I know if the blood is coming from the upper or lower gut? Bright red blood on the surface usually comes from the lower bowel or rectum. Black, tarry stool means digested blood from the stomach or upper small intestine, which is more serious. Both types need veterinary attention, but black stool is more urgent. ### Should I change my cat's food if there is blood in the poop? Do not make a sudden diet change on your own, because it can make diarrhea worse. Long-term food management is part of treating many chronic gut conditions, but the right diet depends on the diagnosis [5]. Ask your vet which food fits your cat's specific problem. ### Can blood in cat poop go away on its own? Sometimes mild colitis or a short bacterial infection clears with supportive care, and signs may last 5 to 15 days [1]. Even so, you should not assume it will resolve without help. If the blood continues, gets heavier, or your cat shows any red flag, see a vet right away. ## Related Articles - [Cat Diarrhea with Blood: Urgency and Next Steps](/knowledge/veterinary-medicine/vet-visit-decisions/cat-diarrhea-with-blood) - [Cat Diarrhea with Blood and Mucus: Causes and When to Act Fast](/knowledge/veterinary-medicine/digestive-and-urinary-care/cat-diarrhea-blood-mucus-causes) - [Cat Blood in Urine: Causes and When to Rush to the Vet](/knowledge/veterinary-medicine/digestive-and-urinary-care/cat-blood-in-urine-causes-when-to-rush) - [Cat Peeing Blood: What Should You Do?](/knowledge/veterinary-medicine/symptom-guides/cat-peeing-blood) - [Cat Blood in Urine but Acting Normal: Causes and Next Steps](/knowledge/veterinary-medicine/digestive-and-urinary-care/cat-blood-urine-acting-normal) - [Cat Vomiting and Diarrhea with Blood: Emergency Signs](/knowledge/veterinary-medicine/digestive-and-urinary-care/cat-vomiting-diarrhea-blood-emergency) ## References 1. [Disorders Caused by Bacteria of the Digestive System in Cats - Cat Owners](https://www.merckvetmanual.com/cat-owners/digestive-disorders-of-cats/disorders-caused-by-bacteria-of-the-digestive-system-in-cats). Merck Veterinary Manual. 2. [Case report: Lymphocytic-plasmacytic and eosinophilic enterocolitis presented with marked eosinophilia and basophilia in a cat](https://pubmed.ncbi.nlm.nih.gov/37732139/). Frontiers in veterinary science, 2023. 3. [A case of feline primary duodenal carcinoid with intestinal hemorrhage](https://pubmed.ncbi.nlm.nih.gov/31257234/). The Journal of veterinary medical science, 2019. 4. [Washing machine-induced trauma and coagulopathy in a kitten](https://pubmed.ncbi.nlm.nih.gov/39649736/). The Canadian veterinary journal = La revue veterinaire canadienne, 2024. 5. [Feline chronic diarrhea: causes and nutritional management](https://pubmed.ncbi.nlm.nih.gov/42502773/). Veterinary and animal science, 2026. ## Further Reading - [American Veterinary Medical Association: First Aid Tips for Pet Owners](https://www.avma.org/resources-tools/pet-owners/emergencycare/first-aid-tips-pet-owners) - [Merck Veterinary Manual: Cat Owners](https://www.merckvetmanual.com/cat-owners) - [Cornell Feline Health Center: Health Information](https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information)