Serious severity

Gastrointestinal Obstruction (Swallowed Object)

A blockage of the stomach or intestines by a swallowed object — a hair tie, thread, bone, toy or wad of fabric — that stops food and fluid passing through. It is a genuine emergency.

⚠️ Common symptoms

Repeated vomiting, often straight after eating or drinkingComplete loss of appetiteLethargy and hiding awayA tense, painful or swollen bellyStraining with little or no stoolDrooling or repeated lip-licking (nausea)Rapid dehydration and weakness

A gastrointestinal obstruction is exactly what it sounds like: something physically blocks the passage of food, fluid and gas through the stomach or intestines. In cats the culprit is very often an object they have swallowed — cats explore the world with their mouths, and a batted-around hair tie, a length of ribbon, a chewed-off toy part or a swallowed bone can lodge somewhere along the digestive tract and stop everything behind it moving on.

String and thread deserve a special warning, because they cause the most dangerous kind of blockage. When one end of a piece of string catches — snagged under the tongue, or anchored in the stomach — while the rest is carried onward by the gut's normal muscular waves, the intestine concertinas up along the string like fabric gathered on a drawstring. Worse, the taut thread can slowly cut through the delicate intestinal wall from the inside. This 'linear foreign body' is why you should never pull on any string you can see hanging from a cat's mouth or bottom: the far end may be firmly attached deep inside.

The signs build over hours to a couple of days. A cat with a blockage typically vomits repeatedly — often bringing food or water straight back up because nothing can get past the obstruction — goes completely off its food, becomes quiet and withdrawn, and may sit hunched with a tender belly. Because it cannot keep fluids down, dehydration sets in quickly, and a cat can deteriorate alarmingly fast.

This is one of the clearest 'do not wait and see' situations in cat care. Prompt diagnosis with imaging and, in most cases, surgery to remove the object gives a good chance of full recovery, whereas a blockage left too long can lead to a ruptured, dying section of gut and life-threatening infection of the abdomen. If your cat is vomiting repeatedly and refusing food — and especially if anything stringy or swallowable has gone missing — it is a trip to the vet that should not be put off.

🔍 Causes

Cats swallow things they should not — hair ties, ribbon, thread, tinsel, small toys, corn cobs, bones or lumps of fabric, especially cats that chew or eat non-food items (pica). String and thread are particularly dangerous: if one end lodges under the tongue or in the stomach while the rest travels on, the intestine gathers up along it and the taut 'linear foreign body' can saw through the gut wall. Hairballs that fail to pass can occasionally block the outflow of the stomach too.

🛡 Prevention

Keep swallowable temptations out of reach — hair ties, dental floss, sewing thread, ribbon, rubber bands, the string from roasting joints, tinsel and small toy parts. Choose sturdy toys with no easily-detached pieces, and put craft materials and fishing tackle safely away. Cats that chew fabric or eat odd objects should be seen by a vet, as the habit itself is a risk, and good hairball management — grooming plus a vet-recommended remedy if needed — removes one avoidable cause.

💊 Treatment

A suspected obstruction is an emergency. The vet confirms it with a physical exam, X-rays and sometimes ultrasound or a contrast study. A small object caught very early can occasionally be retrieved with an endoscope, but most true obstructions need surgery to remove the object and check the gut for damage; a length of intestine that has lost its blood supply may have to be removed altogether. Cats are stabilised first with intravenous fluids and pain relief, then recover over the following days on a carefully reintroduced diet. The earlier it is treated, the better the outlook.

When to see a vet: Treat it as an emergency and ring your vet straight away if your cat is repeatedly vomiting, has stopped eating, seems painful or bloated, or is straining without producing stool — especially if you have seen it playing with or chewing string, tinsel or a small object. If you can see thread caught under the tongue or trailing from the mouth or bottom, do not pull it — go to the vet immediately, because pulling can worsen the internal damage.

⚕️ Medical disclaimer

  • This information is educational only and is not a substitute for veterinary advice.
  • Symptoms overlap between conditions — only a vet can diagnose accurately.
  • Never withhold treatment or self-medicate based on information found online.
  • When in doubt, call your vet. Early intervention almost always leads to better outcomes.

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