Intestinal Blockage in Cats: Signs, Swallowed & Linear Foreign Bodies

Sep 10 • 10 min read

You noticed a piece of string missing from the sewing box yesterday. Today your cat has vomited three times, hasn't touched her food, and seems to be hiding more than usual. On its own, none of this proves anything but this exact combination is precisely why vets treat any swallowed non-food object in a cat as a potential emergency until proven otherwise.

Direct Answer: An intestinal blockage happens when something a cat has swallowed string, a hair tie, a toy, ribbon, or another object gets stuck somewhere along the digestive tract and stops food, fluid, and gas from moving through normally. It's a true emergency because a blockage can cut off blood supply to the bowel and, if the object is a linear one like string, can actually saw through the intestinal wall. Common signs include vomiting, not eating, lethargy, and abdominal pain. Diagnosis usually needs imaging, and many cases need surgery to remove the object safely.

Key Takeaways

An intestinal blockage occurs when a swallowed object gets stuck in the stomach or intestines, stopping normal digestion and movement through the gut.
Cats are especially known for swallowing linear foreign bodies string, yarn, ribbon, hair ties, dental floss, and tinsel which are more dangerous than most other objects.
With a linear foreign body, one end often anchors under the tongue or in the stomach while the other end trails through the intestines, causing the bowel to bunch up and potentially tear.
Common signs include vomiting, refusing food, lethargy, abdominal pain, drooling, diarrhoea, and sometimes visible string at the mouth or under the tail.
If you see string trailing from your cat's mouth or rectum, do not pull it it may be anchored elsewhere and pulling can cause serious internal damage.
Diagnosis usually involves an exam, bloodwork, and imaging; many blockages, especially linear ones, need surgery to remove safely.

What Is an Intestinal Blockage in Cats?

An intestinal blockage happens when a swallowed object gets stuck somewhere along the digestive tract the stomach, the small intestine, or the colon and stops food, fluid, and gas from moving through normally, according to SpectrumCare. See your vet immediately if you think your cat may have swallowed something it shouldn't have. A blockage can happen when a cat swallows string, yarn, ribbon, hair ties, toys, bones, or other objects that get stuck in the stomach or intestines.

The Merck Veterinary Manual explains why this matters so much physiologically: obstructions can be partial or complete, depending on whether the object is able to pass through the GI tract at all. Large, round objects often cause a complete obstruction, while linear or small objects are more likely to cause a partial one though as we'll cover next, partial doesn't necessarily mean safer.

Why Linear Foreign Bodies Are Especially Dangerous

Simple illustration showing how a linear foreign body like string can anchor and bunch a cat's intestines.

Merck is clear on an important species difference: cats are more likely than dogs to develop an intestinal obstruction from a linear foreign body, while dogs are generally more likely to ingest a foreign body overall. This matters because linear objects behave very differently inside the gut than a solid toy or bone.

VCA Hospitals describes the mechanism in detail. A linear foreign body string, yarn, tinsel, ribbon, or dental floss often gets one end lodged somewhere in the gastrointestinal tract, commonly at the base of the tongue, while the rest trails down through the stomach and intestines. As the intestines try to move this trailing object along through their normal muscular contractions (peristalsis), the object can't move but the intestine keeps trying anyway, essentially crawling up along the length of the string. This causes the bowel to bunch and fold, similar to fabric gathering around a drawstring that's anchored at one end.

The most significant possible complication of a linear foreign body is intestinal perforation, or tearing. As the bunched intestine keeps moving against the taut string, a sawing motion develops along the intestinal wall, and this can eventually cut all the way through it. A tear like this lets intestinal contents leak into the abdomen, causing peritonitis a genuinely life-threatening inflammation of the abdominal lining that can progress to sepsis. Merck adds that linear foreign body obstructions specifically carry a higher risk of perforation than other types of blockage, which is exactly why vets take swallowed string, no matter how small the object might seem, seriously.

What Do Cats Actually Swallow?

According to SpectrumCare, blockages in cats are often caused by foreign material such as string, yarn, ribbon, hair ties, toys, bones, or other swallowed items. VCA Hospitals adds thread, wool, paper, rubber bands, and plant material to the list of things cats commonly ingest while investigating or playing.

Not every swallowed object causes a problem many pass through the digestive tract without incident, and it's genuinely common for cat parents to find all sorts of things in vomit or stool. The risk rises sharply with linear objects specifically, and also with objects too large to pass through the width of the intestine, which in an adult cat is only about as wide as a finger.

Merck notes that young animals are more likely to develop a foreign body obstruction than older ones, likely reflecting more exploratory, mouth-first behaviour. There's no known sex predisposition, though behavioural conditions like pica a tendency to eat non-food items and any illness or medication causing increased appetite are recognised risk factors worth mentioning to your vet if they apply to your cat.

Signs of an Intestinal Blockage

Common signs of an intestinal blockage in cats, per SpectrumCare and VCA Hospitals, include:

Vomiting, often repeated
Not eating or refusing food
Lethargy or hiding
Abdominal pain
Drooling
Diarrhoea
Straining in the litter box, or producing little to no stool
String or material visible at the mouth or under the tail

Merck notes that the exact signs depend heavily on the location and duration of the obstruction. Vomiting tends to be less common with an obstruction further down the small intestine, while it's usually one of the earliest and most obvious signs with a stomach or upper intestinal blockage. Diarrhoea, weight loss, lethargy, and signs of shock are somewhat less common overall but do occur, particularly as a blockage progresses or complications develop.

One especially important sign: if you see string, thread, or similar material trailing from your cat's mouth or protruding from under the tail, do not pull it. It's very often anchored somewhere else in the digestive tract, and pulling can cause significant additional internal damage. This deserves an immediate vet visit, not a home attempt at removal.

What NOT to Do If You Suspect a Blockage

Infographic showing what to do and what not to do if a cat may have swallowed a foreign object.

A few instincts that feel helpful can actually make things worse:

Don't pull on visible string. As covered above, one end is very likely anchored elsewhere, and pulling risks tearing the intestine.
Don't try to induce vomiting at home. If a linear object is already partially swallowed, vomiting can worsen the bunching effect and increase the risk of the object cutting through tissue. Only attempt this if a vet or poison control specifically instructs you to.
Don't wait to "see if it passes." Some small, non-linear objects genuinely do pass on their own with veterinary monitoring, but this decision should be made by your vet based on imaging and your cat's condition, not guesswork at home. Waiting without veterinary guidance risks the object moving into a location with reduced blood supply, where damage accelerates.
Don't give human pain relievers or anti-nausea medication on your own. Many are unsafe for cats and can mask worsening signs while doing nothing to address the underlying blockage.

How Vets Diagnose an Intestinal Blockage

Diagnosis typically starts with a thorough history and physical exam. Your vet will ask what your cat may have had access to, when signs started, and whether you've noticed vomiting, appetite changes, or altered bowel movements. During the exam, your vet will check the abdomen for pain or a palpable mass, and will also examine the sublingual area under the tongue since this is a classic anchor point for linear foreign bodies in cats.

Bloodwork helps assess your cat's overall condition, hydration, and whether there are signs of a broader systemic problem developing. Abdominal X-rays are a key part of imaging, since they can show gas patterns, dilated loops of intestine, or an object itself if it's radiopaque. Not every object shows up clearly on X-rays, though, so your vet may recommend an abdominal ultrasound as well, which can be more effective specifically for detecting a linear foreign body and evaluating blood flow to affected tissue.

If the object is still in the stomach and can't be retrieved by inducing vomiting safely, endoscopy passing a camera down the throat may allow removal without open surgery. This is generally only an option while the object remains in the stomach or upper GI tract; once it has moved into the intestines, surgery becomes the standard approach.

Treatment: Monitoring, Endoscopy, or Surgery

Treatment depends on where the object is, what it is, and how your cat is doing clinically. SpectrumCare frames this as a genuine range of options depending on the individual case:

Conservative monitoring may be reasonable for a stable cat with a small, smooth object that hasn't caused a complete obstruction. This typically includes an exam, baseline bloodwork, X-rays, supportive fluids, anti-nausea medication, and repeat imaging to track whether the object passes on its own. This path isn't appropriate for every cat especially not those with signs of complete obstruction, perforation, or shock.

Surgical removal is the standard treatment when imaging and exam findings support a true blockage, particularly once the object has moved beyond the stomach or your cat is vomiting, painful, dehydrated, or not passing stool normally. This typically involves emergency evaluation, lab work, abdominal imaging, general anaesthesia, exploratory abdominal surgery, foreign body removal, and one to three days of hospitalisation with discharge medications.

More complex care becomes necessary if the intestine has been damaged, has lost blood supply, or has already perforated. This can mean bowel resection and anastomosis removing and rejoining a damaged section of intestine along with more intensive monitoring, longer hospitalisation, and treatment for peritonitis if it's already developed.

After surgery, cats typically stay hospitalised for one to three days for IV fluids and pain control. VCA Hospitals notes that in the first 24 hours, cats are usually fed small amounts of a bland, easily digestible diet to help the gut resume normal movement, with meal sizes gradually increased as your cat tolerates food well. An Elizabethan collar is standard during recovery to prevent your cat from disturbing the incision site while it heals.

Prevention: Cat-Proofing Against Foreign Bodies

Pet parent storing string, hair ties, and small toys safely away from a cat to prevent intestinal blockage.

Because most intestinal blockages in cats start with everyday household items, prevention is genuinely achievable with a few consistent habits:

Store sewing supplies, string, ribbon, rubber bands, and hair ties in closed drawers or containers your cat can't access, rather than left out on counters or tables.
Supervise play with string toys, wand toys, and anything with a long thread, and put them away after playtime rather than leaving them out for unsupervised access.
Dispose of dental floss, sewing thread, and similar items in a covered bin your cat can't get into.
Keep small toys, hair accessories, and loose small objects off floors and low surfaces, especially in homes with young or particularly curious cats.
If your cat has a history of eating non-food items, mention this to your vet a pattern like this is worth investigating rather than just managing after each incident.

FAQ

My cat vomited up part of a string but seems fine now — should I still see a vet?
Yes. If any portion of a linear object was swallowed and you're not certain the entire thing came back up, or if your cat shows any of the warning signs above, a vet visit is the safer choice. The remaining portion could still be anchored internally even if some of it has already been vomited.

Can a swallowed toy or hair tie pass on its own?
Sometimes, yes but only under veterinary guidance. A vet can use imaging to track a small, smooth object's progress and decide whether monitoring is appropriate, versus recommending removal. This isn't a decision to make alone at home, since a partial obstruction can still cause serious tissue damage while you wait.

Why is string so much more dangerous than a swallowed toy?
A solid toy either passes through or gets stuck as a single blockage point. A linear object like string can anchor at one end while the rest of it trails through the intestines, causing the bowel to bunch and creating a sawing effect that can tear through the intestinal wall a mechanism that a compact solid object doesn't share.

What happens if a blockage isn't treated in time?
Prolonged obstruction can cut off blood supply to the affected section of intestine, causing tissue damage or death. If the intestine perforates, its contents leak into the abdomen, causing peritonitis a life-threatening infection that requires much more intensive and costly treatment than an early, uncomplicated blockage.

Is my cat more at risk if she's young?
Yes, somewhat. Younger cats tend to explore more with their mouths and are statistically more likely to develop a foreign body obstruction than older cats, though any cat at any age can swallow something they shouldn't.