Cat Vomiting Blood: Causes and When to Call a Vet

Updated 18 October 2026 · Researched against Cats Protection, PDSA and International Cat Care guidance

Finding blood in a pile of cat vomit is frightening, and the urge to search for a reassuring answer is strong. The honest answer is that blood can mean something minor — a small tear in the stomach lining after a violent bout of retching — or something that needs surgery within hours. This guide explains what the two main appearances mean, the causes UK vets see most often, and what to do in the next fifteen minutes.

This is one page in our wider cat vomiting guide, which covers the colour, timing and frequency patterns for every kind of cat vomit.

1. Fresh Blood vs Coffee-Ground Material

The appearance of the blood tells your vet where it has probably come from, and how long it has been there.

It is worth checking the litter tray as well as the carpet. Black, tar-like stools (vets call it melena) mean blood has been digested on the way through the gut, and it changes the picture even if the vomit itself only had a faint streak.

2. The Causes UK Vets See Most Often

Gastritis and stomach ulcers

Inflammation of the stomach lining is the most common cause of a small amount of fresh blood in vomit. Severe or repeated vomiting can itself damage the lining, so a cat that has been retching for hours may produce blood without an underlying ulcer. True ulcers are less common but are a recognised risk in cats on long-term anti-inflammatory medication, and in cats with chronic kidney disease or liver disease. This is one reason vets are cautious about long-term painkillers in cats.

Swallowed foreign bodies

String, ribbon, tinsel, hairbands, plastic and cooked bones can all scrape or perforate the gut. A linear object is the classic case: one end anchors under the tongue and the rest saws at the intestine as it contracts. Warning signs are repeated retching with little coming up, vomiting after every meal, a tender or swollen abdomen, and a cat that hides. This needs surgery, not monitoring.

Rodenticide (rat poison)

Anticoagulant rodenticides work by blocking vitamin K, so clotting fails and the cat bleeds internally — sometimes 24 to 72 hours after eating the bait, and sometimes after eating a poisoned mouse. Cats are not the target, but they are certainly exposed. Signs include blood in vomit or stool, black stools, nosebleeds, bruising, pale gums, weakness and collapse. If you suspect any exposure, phone your vet straight away even if your cat looks fine, and take the bait packaging with you.

Toxins and irritants

Lilies, permethrin-containing dog flea products, human painkillers, antifreeze, slug pellets and household cleaners can all cause vomiting with blood, either by direct irritation or by damaging the organs that make clotting factors. Our toxic plants checklist covers the plants involved in most UK cases.

Clotting disorders and systemic illness

Less often, bleeding reflects a problem with clotting itself — inherited disorders, liver disease, some cancers, or a low platelet count. Cats with chronic kidney disease and hyperthyroidism are also more prone to stomach irritation and vomiting in general.

Bleeding from somewhere else

A cat with a bleeding mouth, a nosebleed, or a respiratory problem can swallow blood and then vomit it, which makes the stomach look like the culprit when it is not. Dental disease, a torn tongue, and grass or bone fragments in the mouth are all worth checking when you are looking for the source.

3. What to Do in the Next Fifteen Minutes

1. Phone your vet. Describe the amount, colour and timing, and say whether your cat is eating, drinking and behaving normally. Practices would far rather triage a phone call than see a collapsed cat.
2. Keep a sample or take a photo. A photograph with something for scale is genuinely useful, and a sample in a sealed bag helps if the vet wants to test it.
3. Collect the evidence around the house. Chewed plants, string, packaging, rat bait boxes, dropped painkillers. Bring what you find.
4. Do not give any medication. No aspirin, no ibuprofen, no paracetamol, no human anti-sickness tablets. All can make things worse.
5. Do not induce vomiting. With sharp objects and caustic substances it does more harm than good.
6. Keep your cat warm and calm in a carrier with a towel, and travel with someone if you can so the cat is not loose in the car.

4. Signs That Mean Emergency, Not Appointment

During the day, ring your own practice. Out of hours, use your practice's emergency number or an out-of-hours hospital — most UK practices divert to one, and it is worth saving that number in your phone before you need it.

5. What Your Vet Will Do

The examination comes first: gum colour, heart rate, hydration, abdominal palpation, temperature and weight. After that, expect blood tests including a clotting profile and red-cell count, and often imaging — X-rays for foreign material and free gas, ultrasound for masses, ulcers and intestinal layering.

Treatment depends on the cause and is your vet's decision, not something a website can supply. Options include anti-nausea medication, stomach protectants, intravenous fluids, vitamin K for rodenticide poisoning, a prescription diet, or surgery for a foreign body or a bleeding mass. A cat that has lost a lot of blood may need a transfusion.

6. Preventing a Repeat

• Never give human painkillers. If your cat seems painful, that is a vet conversation, not a medicine-cabinet decision.
• Store rodenticide where cats cannot reach it, and never use bait stations in a house with a hunting cat without a secure box.
• Put string, ribbon, tinsel and hairbands away. This is the single most preventable surgical emergency in cats.
• Ask about stomach protection if your cat needs long-term anti-inflammatory treatment.
• Do not ignore weekly vomiting. Persistent low-level vomiting is how ulcers and chronic disease get missed. Our main vomiting guide explains the frequency thresholds.

7. Frequently Asked Questions

Related reading: cat vomiting white foam, vomiting after eating, and sick cat symptoms.