---
title: "Why Is My Cat Vomiting?"
description: "Why do cats vomit? A plain-English UK guide to hairballs, eating too fast, food intolerance, and red-flag symptoms that mean your cat needs urgent care."
url: "https://pethealth.org.uk/health/why-is-my-cat-vomiting"
canonical: "https://pethealth.org.uk/health/why-is-my-cat-vomiting"
date_published: "2026-06-23"
date_modified: "2026-06-23"
source: "PETHEALTH+"
---

# Why Is My Cat Vomiting?

Cats vomit more often than dogs, and **occasional hairballs** are usually harmless. Frequent vomiting, weight loss, blood, or lethargy is not normal — it can signal food intolerance, parasites, kidney disease, or a blockage. See your vet if vomiting happens more than once a week or comes with other illness signs.

## Common, usually mild causes

**Hairballs** — Cats swallow fur while grooming. Most passes through the gut; some comes back up as a sausage-shaped clump of fur and fluid. Long-haired breeds and heavy groomers are most affected. Regular brushing and hairball diets or gels can help.

**Eating too fast** — Some cats regurgitate undigested food soon after bolting a meal. Smaller, more frequent portions and puzzle feeders slow them down.

**Diet change or rich food** — A sudden switch or an unusual treat can upset a sensitive stomach. Transition foods over 7–10 days.

**Grass or plants** — Occasional plant nibbling may trigger vomiting; ensure houseplants are non-toxic (lilies are deadly to cats — see our [toxic foods guide](/poison-guide)).

## When vomiting may signal illness

Contact your vet if you notice:

- Vomiting **more than once a week** or daily
- **Weight loss** or poor appetite
- **Blood** in vomit (red or coffee-ground appearance)
- **Lethargy**, hiding, or behaviour change
- **Diarrhoea** at the same time
- A **bloated or painful** abdomen
- A **male cat straining** without producing urine (this can be a blocked bladder emergency)

Possible underlying causes include inflammatory bowel disease, food allergy, parasites, pancreatitis, kidney or liver disease, hyperthyroidism (common in older cats), and foreign-body obstruction.

## What your vet may do

They will ask about diet, worming, and frequency, then examine your cat. Tests may include blood work, faecal checks, ultrasound, or imaging if a blockage is suspected. Treatment depends on the cause — from anti-nausea medication and a diet trial to treatment for a specific disease.

## Practical tips at home

- Brush long-haired cats regularly
- Feed smaller meals from slow feeders
- Keep fresh water available
- Never give human medicines without veterinary advice

## FAQs

### Is it normal for cats to vomit?

Occasional vomiting — especially hairballs — is common, but frequent vomiting (more than once a week) or any vomiting with other illness signs is not normal and needs a vet check.

### How can I tell a hairball from something serious?

Hairballs usually produce a tubular mass of fur and happen intermittently in long-haired or heavy-grooming cats. Repeated vomiting, weight loss, or blood always needs investigation.

### Should I change my cat's food if they vomit?

Only after ruling out illness with your vet. Sudden diet changes can themselves cause vomiting — transition slowly if a new food is recommended.

### When is cat vomiting an emergency?

Seek urgent care for repeated vomiting, blood, lethargy, bloated painful abdomen, inability to keep water down, or if a male cat is straining in the litter box.

## Sources

- [PDSA — Cat health advice](https://www.pdsa.org.uk/pet-help-and-advice/pet-health-hub)
- [Blue Cross — Cat advice](https://www.bluecross.org.uk/pet-advice)
- [Cats Protection — Health advice](https://www.cats.org.uk/help-and-advice)

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