Noticing blood in your cat’s stool can be alarming, especially if your feline companion seems otherwise healthy. Even a small streak of red can cause worry, but understanding what might be going on internally can help you take timely and appropriate action.

In this comprehensive guide, we'll explore the possible reasons why blood might appear in your cat’s poop, what it may indicate, and what steps to take to ensure your pet’s health is protected.

What Blood in Cat Stool Can Look Like

The first step is to recognize that not all blood in the stool looks the same. Blood may appear as:

  • Bright red streaks or spots on or around the feces (fresh blood)

  • Dark, tarry stool (digested blood from higher in the digestive tract)

Each type of blood presentation can suggest a different source of the problem.

  • Red blood—also known as hematochezia—typically comes from the colon, rectum, or anus.

  • Black stool—referred to as melena—suggests bleeding further up the gastrointestinal tract, such as the stomach or small intestine.

It's important to carefully observe and document what you see, as this information will be helpful for your veterinarian.

Possible Causes of Blood in Cat Stool

There are numerous reasons why a cat may have blood in its stool. Some are relatively benign and easily treatable, while others can be more serious and require urgent care. Below are the most common causes.

1. Constipation

Straining to pass hard or dry feces may cause small tears or irritation near the anus or within the rectum. This can lead to the appearance of fresh red blood. Cats that are dehydrated, suffer from a poor diet, or have limited mobility are especially at risk.

2. Colitis (Inflammation of the Colon)

Colitis is a condition in which the colon becomes irritated and inflamed. This can lead to loose stools mixed with mucus and bright red blood. Causes of colitis can include:

  • Food allergies

  • Stress

  • Bacterial or parasitic infections

  • Sudden changes in diet

3. Intestinal Parasites

Roundworms, hookworms, whipworms, and other intestinal parasites are common culprits—especially in kittens or outdoor cats. These parasites can damage the intestinal lining, leading to bleeding. Regular deworming is essential to prevent infestation.

4. Dietary Indiscretion or Allergies

Cats that eat inappropriate items or experience food intolerance may develop gastrointestinal upset. A sudden change in food or ingestion of spoiled or fatty food can also cause inflammation or mild trauma to the digestive tract, which may result in blood in the stool.

5. Inflammatory Bowel Disease (IBD)

This chronic condition involves the immune system attacking parts of the digestive system. Cats with IBD often have intermittent diarrhea, vomiting, and blood or mucus in their stool. Long-term treatment and dietary management are typically required.

6. Foreign Objects or Trauma

Sharp items or materials that a cat swallows may irritate or tear the digestive tract, leading to bleeding. Even excessive licking and ingesting hair (as in hairballs) can lead to minor injury if combined with constipation or other issues.

7. Tumors or Cancer

In some cases, bleeding from the rectum or intestinal tract may be due to polyps, growths, or cancers affecting the gastrointestinal system. These situations usually come with additional symptoms such as weight loss, loss of appetite, or lethargy.

What to Do If You See Blood in Your Cat’s Stool

If the blood is bright red and appears just once in a small amount, it may not indicate an emergency—but it should not be ignored either. Here's what to do:

Step 1: Observe Closely

Take note of the following:

  • Color and consistency of the stool

  • Amount and color of blood

  • Frequency of the issue

  • Other symptoms (e.g., vomiting, diarrhea, straining, appetite loss)

Take a photo or sample of the stool if possible to show your vet.

Step 2: Monitor Behavior

Even if your cat is acting normally, monitor them over the next 24–72 hours. Look for:

  • Reduced energy levels

  • Reluctance to eat or drink

  • Vomiting

  • Difficulty defecating

  • Abdominal pain

  • Recurrent or worsening symptoms

If the blood appears again or your cat develops additional symptoms, veterinary care is essential.

When to See the Vet Immediately

Call or visit your vet without delay if your cat experiences:

  • Repeated bloody stools over a short period

  • Diarrhea lasting longer than 2–3 days

  • Constipation for more than 2 days

  • No bowel movement at all

  • Significant amounts of blood or mucus

  • Lethargy or weakness

  • Refusal to eat or drink

  • Vomiting in addition to bloody stool

These signs may indicate a more serious condition that requires immediate attention.

Diagnosis: What Your Vet May Do

Your veterinarian will begin with a physical exam and take a history of your cat’s recent behavior and diet. They may recommend one or more of the following tests:

  • Fecal examination (to check for parasites)

  • Blood tests (to identify infections or organ issues)

  • X-rays or ultrasound (to rule out obstructions or tumors)

  • Colonoscopy or biopsy (in chronic or unclear cases)

These diagnostic steps will help pinpoint the root cause of the bleeding and determine the appropriate course of action.

Treatment Options

Treatment will depend on the cause but may include:

1. Deworming or Antiparasitic Medications

If parasites are to blame, your vet will prescribe a deworming treatment tailored to the type of parasite found.

2. Dietary Adjustments

For constipation, a switch to high-moisture food, increased fiber, or prescription gastrointestinal diets may help regulate bowel movements.

For allergies or IBD, hypoallergenic diets or limited-ingredient foods may be necessary.

3. Antibiotics or Anti-Inflammatory Medications

If a bacterial infection or colitis is diagnosed, medication to fight inflammation or infection will likely be prescribed.

4. Hydration and Supportive Care

Cats suffering from diarrhea or vomiting may need fluids to restore hydration and balance electrolytes.

5. Surgery

In rare cases involving tumors, foreign bodies, or severe structural issues, surgical intervention may be required.

At-Home Support

While waiting for your vet appointment—or for mild cases—some supportive care can help ease symptoms:

  • Wet food: Helps with hydration and softens stool

  • Pumpkin or fiber supplements: May help with mild constipation (use only if advised by your vet)

  • Clean litter box regularly: Makes it easier to monitor changes and prevents further irritation

Avoid giving any medications, even over-the-counter ones, unless specifically instructed by a veterinarian.

Why Cats Can Act Normal Even When Sick

Cats are masters at concealing discomfort. This instinctive behavior is a defense mechanism, especially in the wild. So even if your cat seems playful, alert, and eating normally, internal issues may still be developing.

That’s why any visible sign like blood in the stool should be taken seriously—even in the absence of other symptoms. If in doubt, it’s always safer to schedule a vet visit.

Final Thoughts

Finding blood in your cat’s stool can be unsettling, but it doesn't always point to a severe issue. Still, careful observation, early action, and communication with your veterinarian are crucial to rule out more serious problems.

With the right care and timely intervention, most causes of blood in a cat's stool can be treated effectively. As always, your cat’s litter box can tell you a lot about their health—so keep an eye on it regularly.