Cats vomit. Some vomit weekly, others go years without. A single episode in an otherwise normal cat is almost never an emergency. The questions that matter are how often, what it looks like, and how the cat acts afterwards.
What counts as normal
Occasional vomiting — once or twice a month, food or hairball, cat walks away and resumes its day — is something most healthy cats do. The usual triggers:
- Eating too fast. Common in households with multiple cats or free-fed dry food. The vomit is undigested kibble, often in a tube shape, within minutes of eating.
- A hairball. Recognisable wad of fur, sometimes with bile.
- A diet change made too quickly. Transition new food over 7 to 10 days, not overnight.
- A bit of grass or a houseplant. Cats sometimes vomit after eating greenery.
In all of these, the cat is normal otherwise — eating, drinking, alert.
What's concerning
Treat as a vet call, same day or next morning:
- More than twice in 24 hours.
- Daily vomiting for more than three days, even if mild.
- Vomiting paired with lethargy, hiding, or refusing food.
- A kitten or senior cat vomiting at all. Both dehydrate quickly.
- Vomiting with diarrhoea. The combination drains fluid fast.
- Vomiting after eating a known toxin — chocolate, lily petals, human medication, antifreeze. Call the vet before waiting to see what happens. See foods toxic to cats for the common ones.
Reading the colour
The contents tell you something about where the vomit came from.
- Foamy and white. Usually empty stomach — bile reflux. Common in the early morning before breakfast. If frequent, a small late-night snack often resolves it.
- Yellow or green. Bile. Empty stomach or stomach upset. Worth flagging if it happens more than occasionally.
- Clear liquid. Often water drunk too fast, or early gastritis.
- Pink-tinged or red streaks. Blood from the throat or stomach lining. Same-day vet.
- Coffee-ground brown. Digested blood. Same-day vet, not next morning.
- Brown and foul-smelling. Could be partially digested food, or in rare cases an intestinal obstruction pushing material backwards.
Frequency patterns
How often the cat vomits is more useful than any single episode.
- Once and done, cat normal: observe, no action.
- Weekly, same context (e.g. after eating): likely behavioural — feeding too fast, food sensitivity. Try slow-feeder bowls and a hypoallergenic food trial.
- A few times a week, no clear pattern: book a vet appointment. Chronic vomiting in cats often points to inflammatory bowel disease, food allergies, or — in older cats — hyperthyroidism or kidney disease.
- Sudden onset, multiple times in a day: treat as urgent.
What to do in the moment
Withhold food for two to four hours. Offer small amounts of water; if the cat keeps that down, offer a small portion of a bland food (boiled chicken, no skin or seasoning) and see how it sits. Resume normal food the next day if there's no further vomiting.
Don't give human anti-nausea medication. Most are toxic to cats. Pepto-Bismol contains salicylate; Imodium can cause neurological symptoms. If you need something, call the vet for a feline-safe prescription.
When to skip the wait
Go straight to the emergency vet — see when to go to the emergency vet — if your cat is vomiting and:
- Cannot keep water down for more than 12 hours.
- Has a swollen, painful abdomen.
- Is collapsed, very weak, or unresponsive.
- Has swallowed string, ribbon, or a foreign object you can see at the mouth — never pull on it.
The cost of bringing a vomiting cat in early is small. The cost of waiting through a serious obstruction or toxin is not.