Why Is My Cat Being Sick? Vomiting Causes and What to Do

The odd bit of sick is fairly common in cats and often nothing to worry about — but frequent or repeated vomiting, or sickness alongside other signs, can point to something that needs attention. Knowing what's normal and what isn't helps you respond calmly. This is general guidance, not a substitute for veterinary advice — if you're worried, contact your vet.

Is occasional vomiting normal?

Many cats are sick now and then — bringing up a hairball, eating too fast, or a bit of grass they've nibbled in the garden. An otherwise bright, well cat that's sick once and then carries on eating and playing as normal is usually fine to simply monitor. A useful rule of thumb is to look at the whole cat, not just the puddle: a happy cat who's been sick once is very different from a quiet, hunched one.

It's repeated vomiting, or sickness alongside other symptoms, that matters more — and it's worth gently challenging the idea that frequent vomiting is "just what cats do". Regular sickness isn't normal and shouldn't be brushed off, even if your cat seems otherwise well.

Common causes of vomiting

• [Hairballs](/hub/hairballs-in-cats) — a very common, usually harmless cause
• Eating too fast or a sudden diet change
• Dietary indiscretion — eating something they shouldn't, including toxic foods or plants
• Tummy upsets, worms or infections — see worming cats
• Ongoing conditions — such as kidney disease, thyroid problems or inflammatory bowel disease
• Something stuck in the gut — a blockage, which is an emergency

Things to note before you ring the vet

It really helps your vet if you can describe:

• How often your cat is being sick, and for how long
• What's in it — food, froth, bile, hair, or anything unusual
• Whether there's blood (fresh red or coffee-ground specks)
• Any other signs — not eating, diarrhoea, lethargy, losing weight or drooling

Home care for a mild upset

A short bout of mild sickness in an otherwise well cat can often be supported gently at home for a day, as long as you're watching closely and ready to escalate if anything changes. If your cat has been sick once or twice but is otherwise bright:

• Offer fresh water in small amounts so they don't gulp and bring it back up — see cat hydration
• Once settled, offer small, bland meals rather than a big bowl
• Remove anything they might have eaten that's unsafe — our can my pet eat this checker helps you spot hazards
• Avoid sudden diet changes and don't give human anti-sickness medicines

You'll find slow-feeder bowls and water fountains in the shop.

If your cat tends to gobble their food and then bring it straight back up undigested, a slow-feeder bowl or splitting meals into smaller portions can solve the problem entirely — that's "regurgitation" rather than true vomiting, and it's usually nothing sinister. True vomiting, where the food has been in the stomach a while and comes up with effort and retching, is the kind that's more worth keeping an eye on. Knowing roughly which you're seeing, and being able to describe it, genuinely helps your vet narrow things down.

When to see a vet

Contact your vet if your cat:

• Is vomiting repeatedly, can't keep water down, or is being sick over more than a day
• Has blood in the vomit, a swollen or painful tummy, or seems in pain (urgent)
• Is also off food, lethargic, weak, or losing weight
• May have eaten something toxic (e.g. lilies, antifreeze, human medicines) — emergency
• Is a kitten, elderly, or has an existing health condition

Repeated vomiting can quickly lead to dehydration, which makes a cat feel worse and complicates recovery, so don't wait too long if it's not settling. The overall judgement is really about the whole picture: a single bit of sick in a cat who's bouncing around demanding dinner is rarely a drama, whereas vomiting that keeps going, or comes with a flat, hidden-away cat, is your signal to get help. When you're unsure which camp you're in, a phone call to the vet costs nothing and often brings real peace of mind. You can find a vet near you, and our pet insurance guide explains how cover helps with diagnosis.

Sources

• PDSA — Vomiting in cats: https://www.pdsa.org.uk/pet-help-and-advice/pet-health-hub
• International Cat Care — Cat advice: https://icatcare.org/advice/
• Blue Cross — Cat advice: https://www.bluecross.org.uk/advice/cat