A visible mass of pink or red tissue bulging from your cat’s rear end is almost certainly a rectal prolapse, a condition in which part of the rectal lining pushes outward through the anus. It can range from a small, berry-like protrusion that appears only during straining to a large, tube-shaped mass of exposed tissue that stays out permanently. The sight is alarming, but with prompt veterinary care, most cats recover well. What matters most in the short term is understanding what caused it and how quickly you act.
What You Are Actually Seeing
Rectal prolapse in cats comes in two forms. A partial (or incomplete) prolapse involves only the inner mucosal lining of the rectum sliding outward. It often looks like a small ring or bulge of moist, reddish tissue just around the anal opening. A complete prolapse is more dramatic: a cylindrical, double-layered tube of rectal tissue protrudes several centimeters beyond the anus. The exposed tissue is typically dark pink to red, glistening, and swollen. In both cases, the tissue is rectal lining that has been pushed out of place, usually by prolonged or forceful straining.
The distinction between partial and complete matters because it influences treatment. A partial prolapse sometimes retracts on its own once straining stops, while a complete prolapse rarely resolves without veterinary intervention. Your vet can also determine whether the prolapse involves just the rectum or includes a segment of the colon that has telescoped through (a condition called an intussusception), which is a more serious surgical situation.
Why Cats Develop Rectal Prolapse
The immediate trigger is almost always straining, but the real question is what is making your cat strain so hard. The underlying causes fall into a few broad categories, and identifying the right one is the single most important step in preventing the prolapse from coming back.
Intestinal Parasites
Heavy worm burdens are one of the most common reasons kittens and young cats develop rectal prolapse. Roundworms, hookworms, and whipworms can cause severe intestinal inflammation and persistent diarrhea, which leads to repeated, forceful straining (a condition vets call tenesmus). In kittens especially, severe parasitic infection and the enteritis it causes are closely linked to prolapse events.1International Journal of High Dilution Research. Homeopathic Treatment of Rectal Prolapse in a Kitten This is why a fecal exam is typically one of the first tests your vet will run. If parasites are the culprit, treating the infestation often resolves the straining and prevents the prolapse from recurring.
Inflammatory and Infectious Bowel Disease
Chronic large-intestinal disease is another major driver. Conditions like inflammatory bowel disease (IBD), colitis, and certain bacterial infections cause ongoing diarrhea, blood in the stool, and the kind of relentless straining that weakens the tissues anchoring the rectum in place. One documented case involved a six-year-old domestic shorthair cat that had been dealing with bloody diarrhea, mucus in the stool, and straining for six months before developing rectal prolapse. The underlying cause turned out to be a rare form of granulomatous colitis caused by an invasive strain of E. coli, similar to a condition more commonly seen in certain dog breeds.2Veterinary Record Case Reports. Escherichia coli‐associated granulomatous colitis in a cat That cat needed a prolonged course of antibiotics before the signs finally resolved. The point is that chronic bowel inflammation can take many forms, and sometimes the prolapse is the symptom that finally pushes an owner to seek help for a problem that has been building quietly for weeks or months.
Constipation and Obstipation
On the opposite end of the spectrum, severe constipation can also cause enough straining to push the rectum out. Cats that develop megacolon, a condition in which the colon becomes abnormally dilated and loses its ability to move stool along, are at particular risk. Chronic constipation from dehydration, pelvic injuries that narrow the pelvic canal, or simply a diet too low in fiber can all contribute. Any condition that makes defecation painful or difficult can set up the straining cycle that leads to prolapse.3In Practice. Surgical diseases of the colon and rectum in small animals
Other Contributing Factors
Urinary tract obstruction or bladder stones can cause a cat to strain at the litter box in a way that looks similar to straining to defecate, and that abdominal pressure can also push rectal tissue outward. Tumors in the rectum or colon, while less common, create both obstruction and inflammation. In female cats, difficult labor (dystocia) can occasionally trigger a prolapse from the extreme abdominal effort involved. And in some cats, anatomical differences in the anus itself are the root cause: two documented cases involved cats whose anal openings were unusually wide, allowing the rectal mucosa to prolapse outward during normal defecation without any underlying intestinal disease at all.4PubMed Central. Silicone elastomer sling for rectal prolapse in cats
When It Becomes an Emergency
A rectal prolapse always warrants a vet visit, but certain signs mean you should treat it as an emergency. The biggest danger is tissue necrosis. When rectal tissue stays prolapsed and exposed for more than a few hours, it starts to dry out, swell, and lose blood supply. Left untreated, the exposed mucosa can ulcerate, become infected, and eventually die. One emergency case documented a domestic cat with a prolapsed rectum that had already developed visible areas of dead tissue, along with pale gums and dehydration by the time it was seen.5ARSHI Veterinary Letters. Emergency management of necrotic rectal prolapse in a domestic cat
Signs that the prolapse has become urgent include tissue that has turned dark purple, black, or grey instead of healthy pink; a foul smell coming from the area; your cat seeming lethargic or refusing to eat; or visible wounds on the exposed tissue. Necrotic tissue may require amputation of the dead portion rather than simple reduction, which is a more invasive surgery with a harder recovery. The lesson here is that time matters. A fresh prolapse that is still pink and moist is far easier and safer to treat than one that has been exposed for a day or more.
What to Do at Home Before the Vet Visit
You cannot treat a rectal prolapse at home, but you can protect the tissue while you arrange to get to a veterinarian. The goal is to keep the exposed tissue moist, clean, and as free from further trauma as possible.
- Keep it moist: Gently apply a water-soluble lubricant (like KY Jelly) or a saline-soaked gauze pad to the prolapsed tissue. Do not let it dry out.
- Prevent licking: If you have an Elizabethan collar (cone), put it on your cat. Cats will instinctively lick and bite at the tissue, which causes more swelling and damage.
- Do not push it back in: Attempting to manually reduce the prolapse without proper technique and lubrication can cause tearing or additional injury. Leave this to your vet.
- Keep your cat calm: Confine your cat to a small, quiet space. Less activity means less straining and less chance of the prolapse worsening.
These steps are temporary measures. Even if the tissue looks relatively healthy, your cat needs professional assessment as soon as possible.
How Veterinarians Treat Rectal Prolapse
Treatment depends on whether the prolapse is a first-time event or keeps coming back, how healthy the tissue looks, and what underlying condition caused it in the first place.
Manual Reduction and Purse-String Suture
For a first-time prolapse where the tissue is still viable, the vet will typically sedate or anesthetize your cat, gently clean the tissue, apply a lubricant or sugar solution to reduce swelling (sugar draws fluid out of swollen tissue through osmosis), and carefully push the rectum back into its normal position. Once reduced, a temporary purse-string suture is placed around the anus. This is a stitch that partially closes the anal opening to prevent the tissue from sliding back out, while still leaving enough room for your cat to pass small, soft stools. The suture stays in for several days while the tissue heals and re-adheres internally. At the same time, the vet addresses whatever caused the straining: deworming medication, antibiotics, dietary changes, or treatment for whatever bowel condition is identified.
The purse-string approach works well when the underlying cause is straightforward and correctable, like a parasite load in a kitten. But if the prolapse keeps returning, it signals either that the root cause has not been fully resolved or that the supporting tissues are too weakened to hold the rectum in place on their own.
Colopexy for Recurrent Cases
When a prolapse recurs despite treating the underlying cause, surgery becomes necessary. The most successful option for recurrent cases is a procedure called colopexy, in which the colon is surgically attached to the abdominal wall. This creates a permanent fibrous adhesion that anchors the colon and rectum in place, physically preventing the tissue from sliding out again. A study evaluating colopexy in six cats and eight dogs found that the prolapse did not recur in any of the 14 animals at follow-up, regardless of which surgical technique was used.6PubMed. Colopexy as a treatment for rectal prolapse in dogs and cats: a retrospective study of 14 cases
Another evaluation of surgical options reached the same conclusion: colopexy produced reliable results with permanent adhesion forming at the fixation site, while purse-string sutures alone were often unsuccessful unless the underlying condition was easily treated, and rectal resection (amputation of the prolapsed segment) carried serious risks including stricture formation, fecal incontinence, and wound breakdown.7Bangladesh Journal of Veterinary and Animal Sciences. Surgical correction of recurrent rectal prolapse by colopexy in cats Rectal resection is generally reserved for cases where the tissue has already become necrotic and cannot be saved.
Addressing Anatomical Abnormalities
In the rare situation where a cat’s prolapse is caused by an abnormally wide anal opening rather than intestinal disease, conventional treatments may not work because there is no underlying inflammation or straining to fix. For these cats, a silicone elastomer sling placed around the anus has been used successfully. The sling narrows the anal opening enough to keep the rectal mucosa from prolapsing during defecation without interfering with normal bowel movements.4PubMed Central. Silicone elastomer sling for rectal prolapse in cats This is a niche procedure, but it illustrates why getting the right diagnosis matters so much: treating for parasites or colitis would do nothing for a cat whose anatomy is the problem.
Recovery and Preventing Recurrence
After a successful reduction or surgery, recovery usually involves a few key elements. Your vet will likely prescribe stool softeners or a high-fiber diet to ensure your cat can defecate without straining. Pain medication and possibly a short course of anti-inflammatory drugs help keep your cat comfortable and reduce the urge to strain. An Elizabethan collar is essential during healing to prevent your cat from interfering with sutures or the surgical site.
The most critical part of recovery is following through on treatment for the root cause. If your cat had a parasite-driven prolapse, keeping up with regular deworming prevents a repeat. If inflammatory bowel disease was the trigger, your cat may need long-term dietary management or medication. The cat with E. coli-associated colitis mentioned earlier had its prolapse and all other symptoms resolve after an eight-week antibiotic course, but the disease came back four weeks later. It took a second, longer twelve-week course before the cat achieved lasting remission.2Veterinary Record Case Reports. Escherichia coli‐associated granulomatous colitis in a cat Chronic conditions like these sometimes require patience and repeated adjustments to treatment before the problem stays away for good.
If constipation was the issue, ensuring your cat stays well hydrated is essential. Cats fed exclusively dry kibble and cats with kidney disease are especially prone to dehydration and hard stools. Wet food, water fountains, and in some cases daily laxative supplements like lactulose become part of the long-term management plan.
Young Kittens and Older Cats
Rectal prolapse is not equally likely across all ages. Kittens are disproportionately affected because they are more vulnerable to heavy parasite burdens and the resulting intestinal inflammation.1International Journal of High Dilution Research. Homeopathic Treatment of Rectal Prolapse in a Kitten A kitten adopted from a shelter or found as a stray that develops a prolapse should always be tested for worms and coccidia, even if a fecal test was recently negative (a single test can miss low-level infections). In many kitten cases, aggressive deworming and supportive care resolve the problem without surgery.
Older cats present a different picture. In senior cats, a prolapse is more likely to be associated with chronic constipation, megacolon, or an underlying mass in the colon or rectum. These cats tend to need more diagnostic workup, often including imaging and possibly endoscopy or biopsy, to rule out tumors or other structural problems. The good news is that surgical options like colopexy work across age groups, and even older cats generally tolerate the procedure well.
Conditions That Mimic Rectal Prolapse
Not every pink or red mass at your cat’s rear end is a rectal prolapse. A few other conditions can look strikingly similar and are worth knowing about, because their treatment is different.
Anal gland abscesses can rupture and produce swollen, reddish tissue near the anus that might be mistaken for a prolapse. These are usually off to one side rather than centered and often have a visible wound or draining tract. Rectal polyps or tumors can protrude from the anus and look like a partial prolapse, but they tend to be firmer to the touch and more irregular in shape. In intact female cats, a vaginal or uterine prolapse can occur (most often around the time of giving birth), and depending on the cat’s anatomy and the owner’s vantage point, it could be confused with a rectal event. Your vet can quickly distinguish between these possibilities on physical exam.
One practical tip: if you can gently pass a lubricated thermometer or small probe alongside the protruding tissue and into the anus, the mass is likely not a rectal prolapse but rather a polyp or tumor arising from the rectal wall. With a true prolapse, the tissue forms a complete cylinder, and you would not be able to pass anything alongside it. That said, this is a diagnostic maneuver better left to your vet rather than attempted at home with a stressed cat.