Cat Health
Why Is My Cat Vomiting?
By Kaiser Khan, EditorPublished Last updated 2 min read
Quick answer
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.
Key takeaways
- 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.
- 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.
- Only after ruling out illness with your vet. Sudden diet changes can themselves cause vomiting — transition slowly if a new food is recommended.
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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).
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
Sources & further reading
This guide draws on the publicly available UK advice listed below. Follow the links for the relevant guidance or the organisation's broader care resources.
PETHEALTH+ is independent. These organisations do not sponsor, approve, or partner with this website. Editorial sources and further reading (last updated 2026-06-23).
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Frequently Asked Questions
- 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.