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Why Does My Cat Keep Vomiting? Causes and When to See a Vet

Most cat owners have heard that dreaded retching sound at some point, but frequent or persistent vomiting is never something to dismiss. Understanding why your cat vomits — and when it needs veterinary attention — can make a real difference to their health and your peace of mind.

Common Reasons Cats Vomit

Cats vomit for a surprisingly wide range of reasons, from the completely harmless to the genuinely serious. The most common cause in otherwise healthy cats is eating too quickly — known as regurgitation — which produces undigested food almost immediately after a meal. This is different from true vomiting, which involves active abdominal contractions and brings up partially digested stomach contents.

Hairballs are another very common cause, particularly in long-haired breeds and cats who groom heavily. As your cat swallows loose fur during grooming, it can accumulate in the stomach and be expelled periodically. Occasional hairballs — perhaps once or twice a month — are generally considered normal.

Dietary indiscretion (eating something that disagrees with them), sudden food changes, or mild food intolerances can also trigger vomiting. Cats can be sensitive to changes in protein source or brand, so switching foods gradually over 7–10 days is always advisable.

More concerning causes include intestinal parasites, inflammatory bowel disease (IBD), hyperthyroidism (especially in older cats), kidney disease, pancreatitis, and foreign body ingestion. If your cat is vomiting frequently or showing other symptoms, a vet visit is warranted to rule these out.

When Is Vomiting a Sign of Something Serious?

Occasional vomiting — once or twice a month in an otherwise healthy, active cat — is rarely cause for alarm. However, there are clear warning signs that should prompt a prompt vet visit. The PDSA advises seeking urgent veterinary attention if your cat vomits more than two or three times in 24 hours, vomits blood, appears lethargic or in pain, or stops eating and drinking.

Vomiting accompanied by weight loss, increased thirst, or changes in litter tray habits can signal systemic illness such as hyperthyroidism or chronic kidney disease — both of which are common in cats over 10. The Blue Cross also highlights that vomiting after eating grass is usually harmless self-purging behaviour, whereas vomiting yellow or green bile on an empty stomach may indicate a digestive issue.

If your cat has potentially swallowed a foreign object — string, elastic bands, tinsel, or small toys are common culprits — treat this as an emergency. Intestinal obstructions can be life-threatening and require immediate surgical intervention, which can cost £800–£3,000 or more depending on the complexity.

Keeping a brief log of when your cat vomits, what it looks like, and whether it correlates with meals or activity can be extremely helpful for your vet in making a diagnosis.

Diagnostic Tests Your Vet May Recommend

For a cat that vomits persistently, your vet will likely start with a thorough physical examination and a detailed history. They may recommend blood tests to check kidney function, thyroid levels, and signs of infection or anaemia. A standard consultation in the UK costs £40–£65, and blood panels typically add £80–£150 on top.

Urinalysis, faecal examination for parasites, and abdominal ultrasound (£150–£300) are all tools commonly used to investigate chronic vomiting. In some cases, endoscopy or biopsies may be required to diagnose inflammatory bowel disease or intestinal lymphoma — both of which are treatable but need accurate diagnosis first.

X-rays may be taken if a foreign body or obstruction is suspected, typically costing £100–£200. While this might seem like a significant expense, catching a problem early almost always reduces the overall cost and improves your cat's outcome. Pet insurance with a good annual limit can absorb much of this diagnostic cost, which is worth bearing in mind before any investigation begins.

Managing Vomiting at Home

If your vet has confirmed your cat is otherwise healthy and the vomiting is occasional and benign, there are practical steps you can take at home. For cats that eat too fast, try a puzzle feeder or slow-feeder bowl, which can dramatically reduce regurgitation. Feeding smaller portions more frequently also helps.

For hairball-related vomiting, regular grooming to remove loose fur before it's swallowed is the most effective prevention strategy. There are also hairball-reduction diets and lubricant pastes available from your vet or pet shop that help move fur through the digestive tract rather than being vomited up.

Avoid feeding your cat human food, particularly dairy, onions, garlic, and anything high in fat, which can trigger gastrointestinal upset. The RSPCA recommends sticking to complete, balanced cat food appropriate for your cat's age and life stage.

If symptoms persist despite home management, return to your vet. Chronic vomiting — even without a definitive diagnosis — should not go unmanaged, as it can lead to oesophageal damage and malnutrition over time.

How CompareMyVet Can Help

If your cat needs investigation for persistent vomiting, the cost of diagnostics and consultations can add up quickly. Consultation fees alone vary between £40 and £65 across UK practices, and that's before any tests are run. Using CompareMyVet at app.comparemyvet.uk, you can compare prices at local vet practices before you book, helping you find the best value without compromising on care.

With CMA reforms now requiring all UK vet practices to publish their standard prices, it's easier than ever to make informed choices. CompareMyVet brings those prices together in one place so you're not ringing around practices or making decisions blind.

Regularly comparing vet prices — especially for ongoing conditions like chronic vomiting — can make a genuine difference to your annual spending on pet care.