Blood at or near a cat’s anus is a symptom, not a diagnosis. It can come from a problem at the anal opening, the rectum, the colon, or further up the digestive tract. Contact a veterinarian whenever you see blood. Seek urgent care sooner if the cat is weak or less responsive, if vomiting or diarrhea persists, or if any tissue is protruding from the anus.
When to act now
- Any visible blood in or on the stool, or at the anus: contact your veterinarian. Do not wait to see whether it resolves on its own.
- Weakness or reduced responsiveness: seek urgent veterinary care. VCA’s emergency guidance lists these signs as reasons for immediate attention.
- Vomiting or diarrhea that persists: seek urgent veterinary care, per the same VCA emergency guidance.
- Tissue protruding from the anal opening: have it examined promptly. Do not try to push it back in yourself.
- Black, tarry stool: report it to your veterinarian even if you see no blood at the anus. Dark, tarry stool can indicate bleeding in the stomach or small intestine.
What the blood looks like points to different places
The appearance and location of the blood are useful clues for the veterinarian, though they cannot establish the cause on their own. The table below organizes the most common presentations.
| What you see | Where the problem most often sits | Signs that often come with it |
|---|---|---|
| Blood at the anal opening or on the fur, with scooting or licking | Anal sacs or the skin around the anus | Scooting, biting at the area, painful defecation with straining, an oozing sore beside the anus |
| Bright red blood on or in stool, with straining | Colon (colitis) or rectum | Frequent passage of stool, mucus in the stool, sometimes diarrhea |
| Blood with straining, constipation, or reluctance to defecate | Rectum or anal wall, such as a tear or polyp | Difficulty passing stool, discomfort during defecation |
| A cylindrical mass protruding from the anal opening | Rectum (possible prolapse) or other protruding tissue | May be visible without other signs; examination is needed to tell types apart |
| Black, tarry stool | Stomach or small intestine | Not stated in the sources reviewed; depends on the veterinarian’s findings |
Possible causes
Several local and digestive conditions can produce bleeding. Standard veterinary references do not give a reliable ranking of which cause most often explains bleeding in cats, so no single cause should be assumed for an individual cat.
Anal sac disease
Anal sacs are small glands on either side of the anus. Anal sac problems in cats most commonly take the form of impaction, and feline anal sac disease is less common than in dogs. Signs can include scooting, licking or biting at the area, and painful defecation with straining. If an abscess forms, it may create an oozing sore next to the anus. Bleeding from this area is reported in the context of these problems.
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Tears in the anal or rectal wall
A tear can follow a sharp foreign object or an injury. Bleeding, straining, constipation, and reluctance to defecate are typical signs. Veterinary examination determines how extensive the tear is, and the depth and location determine how it is treated.
Rectal polyps
Polyps in the rectum can cause straining, blood in the feces, and diarrhea. A veterinarian may detect one on rectal examination, though endoscopy may be needed to see it fully. Surgical removal is commonly used, and the removed tissue is usually sent for analysis to confirm the diagnosis.
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Rectal tumors
Rectal tumors are another possibility that a veterinarian must rule in or out. Merck Veterinary Manual’s cat-owner reference notes that malignant rectal tumors in cats are usually lymphosarcoma and describes chemotherapy for rectal lymphosarcoma. Knowing this is a reason to get tissue evaluated, not a sign that a tumor is present.
Rectal prolapse
A cylindrical mass of tissue protruding from the anus can indicate rectal prolapse, but other protruding tissue can look similar. Merck Veterinary Manual states: “No matter what type of prolapse is present, any tissue mass protruding from the anal opening should be promptly examined by a veterinarian.” The same reference states: “In all animals, identifying and eliminating the cause of rectal prolapse is of primary importance.” That means treating the protruding tissue alone is not enough.
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Anorectal strictures
Narrowing of the anorectal passage, known as a stricture, is listed among local conditions that can cause bleeding and painful straining. Diagnosis and treatment depend on examination.
Colitis
Colitis, inflammation of the colon, can cause straining and frequent passage of mucus-laden stool, sometimes with bright red blood. Causes include infectious, parasitic, dietary, traumatic, and other inflammatory disease. In many chronic cases, the cause is never identified. Colitis is a pattern that requires a workup, not a diagnosis in itself.
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Bleeding higher in the digestive tract
Black, tarry feces can come from bleeding in the stomach or small intestine rather than from anything visible at the anus. Because the stool appearance and the location of the problem may not match, describe the color and consistency accurately rather than assuming the source.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How the veterinarian narrows it down
Diagnosis combines the cat’s history with examination. A typical workup proceeds roughly in this order:
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- History: onset, frequency, stool color and consistency, diet changes, possible injuries or access to foreign objects, and any vomiting, diarrhea, or behavior change.
- Physical and rectal examination: this is often the key step for anal sac disease, polyps, tumors, and prolapse.
- Fecal evaluation: stool testing, which may be useful even before other tests. Ask the clinic whether to bring a recent stool sample.
- Blood or urine tests, imaging, endoscopy, or biopsy: chosen based on findings, particularly when a tumor, colitis, or deeper bleeding is suspected.
Treatment depends on the cause
There is no single treatment for cat bleeding from the anus. The approach follows the diagnosis, and the options below describe what veterinary references report for each condition.
Quick Recap
| Cause | Veterinary treatment direction |
|---|---|
| Anal sac impaction or infection | Veterinary expression of the sacs, treatment of infection, fiber when recommended; surgery for recurrent, refractory, or neoplastic disease |
| Tear | Varies with depth and location; a full-thickness tear may need surgical repair |
| Rectal polyp | Surgical removal is commonly used; tissue is analyzed to confirm the diagnosis |
| Rectal tumor | Depends on type and staging; chemotherapy is described for rectal lymphosarcoma |
| Rectal prolapse | Replacement under anesthesia with temporary sutures, or surgery when tissue is damaged or cannot be repositioned; addressing the underlying cause is central |
| Colitis | Cause-dependent; may include dietary management or medication recommended by a veterinarian |
| Bleeding in the stomach or small intestine | Not stated in the sources reviewed; depends on the veterinarian’s diagnosis |
What not to do at home
- Do not insert anything into the anus.
- Do not manipulate or push back protruding tissue.
- Do not give medication without veterinary direction.
- Do not assume the bleeding will stop on its own because the cat seems comfortable.
What to record before the appointment
- Whether the blood is bright red or the stool is black and tarry, and whether it is on the stool, on the fur, or at the anal opening.
- How often it occurs and when it started.
- Any straining, diarrhea, vomiting, pain, scooting, appetite change, or behavior change.
- Any recent injury, diet change, or possible access to foreign objects.
- A photo of the stool or the affected area, if the clinic allows it, since a visual record helps when the problem is intermittent.
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