By Dial A Vet Veterinary Team
Many people assume cats just vomit, and that a hairball every week or a breakfast brought back up now and then is part of owning one. It is common, but frequent vomiting is not normal. A cat that vomits more than once or twice a month, or is losing weight, is often telling you about something treatable, such as a food sensitivity, bowel inflammation, an overactive thyroid, or kidney disease. And a cat that vomits several times in one day may be dealing with an emergency. This guide helps you tell those situations apart.
Key takeaways
- Repeated vomiting over weeks or months deserves a vet visit, even if your cat seems well otherwise.
- Hairballs more than occasionally can point to overgrooming, skin disease, or slow gut movement.
- Chronic causes include food-responsive disease, inflammatory bowel disease, intestinal lymphoma, hyperthyroidism, and kidney disease.
- Several vomits in a few hours, blood, inability to keep water down, or a string hanging from the mouth or bottom is an emergency.
- Keeping a simple vomiting diary helps your vet find the cause faster.
Vomiting or regurgitation?
Vomiting is an active process. Your cat may drool, lick its lips, and heave from the belly before bringing up partly digested food, froth, or yellow fluid. Regurgitation is more passive, with food coming up quickly and without warning, often looking like an undigested tube shape. Coughing can also be mistaken for retching, and in cats it can signal asthma. A short phone video helps your vet tell these apart.
Common causes of frequent vomiting
- Eating too fast. Cats that gulp food can bring it back within minutes.
- Hairballs. Long-haired cats and heavy groomers swallow more hair. Frequent hairballs warrant a check. See hairballs in cats.
- Food-responsive disease. A reaction to a protein or ingredient in the diet.
- Inflammatory bowel disease and intestinal lymphoma. Both cause chronic vomiting, diarrhoea, or weight loss, particularly in middle-aged and older cats. They can look similar and sometimes need biopsies to tell apart.
- Hyperthyroidism. Common in older cats, often with weight loss despite a good appetite.
- Kidney disease. Nausea is common as kidney function declines. See chronic kidney disease in cats.
- Pancreatitis, liver disease, and diabetes.
- Parasites. More likely in young cats and hunters.
- Foreign bodies. String, ribbon, hair ties, and tinsel are classic culprits.
- Toxins. Lilies are extremely dangerous to cats, even pollen or vase water. Some human medicines are toxic too.
When to see a vet
Go to an emergency vet now if your cat:
- Vomits several times in a few hours, or cannot keep water down
- Has blood in the vomit, or vomit that looks like coffee grounds
- Has string or thread visible under the tongue or from the bottom (do not pull it)
- May have been near lilies, or chewed medicines or chemicals
- Is weak, hiding and unresponsive, or has a painful belly
- Is a male cat straining in the litter tray, as urinary blockage can cause vomiting
Book a same-day appointment if: your cat has not eaten for 24 hours, is vomiting and lethargic, or is a kitten or senior cat with vomiting plus diarrhoea.
Book a routine appointment soon if: your cat vomits more than once or twice a month, has lost weight, or brings up hairballs often, even if otherwise bright.
How vets investigate chronic vomiting
Your vet will start with a detailed history and examination, including weight trend, thyroid feel, belly palpation, and a look under the tongue. Typical next steps include blood and urine tests (kidneys, liver, thyroid, blood sugar), a faecal test, and often B12 and folate levels. Abdominal ultrasound can show thickened intestines, enlarged lymph nodes, or pancreatic changes. If results are inconclusive, a strict diet trial with a hydrolysed or novel protein food for several weeks is often recommended. When ultrasound shows changes or diet trials fail, intestinal biopsies may be needed to distinguish inflammation from lymphoma.
Treatment depends on the cause. It may involve diet change, anti-nausea medication, thyroid or kidney management, or longer-term medicines for bowel inflammation. Your vet will tailor this to your cat.
What helps at home
- Keep a diary: date, time relative to meals, what came up, and anything unusual. Photos help.
- Try smaller, more frequent meals, or a puzzle feeder or slow-feed bowl for fast eaters.
- Brush long-haired cats regularly.
- Change diets gradually over about a week, unless your vet has started a specific trial.
- Keep lilies, string, hair ties, and medicines out of reach.
- Never give human anti-nausea or pain medicines. Many are dangerous for cats.
FAQ
How often is too often for a cat to vomit?
As a rough guide, vomiting more than once or twice a month, or any vomiting with weight loss, is worth a vet check.
Is vomiting yellow liquid serious?
Yellow fluid is usually bile from an empty stomach. Occasional episodes may be minor, but repeated episodes need investigation.
My cat vomits but acts normal. Should I worry?
A bright cat that vomits once is usually fine to watch. A cat that vomits regularly, even while acting normally, often has an underlying issue that is easier to manage early.
Can stress cause vomiting in cats?
Stress can contribute, but it is best to rule out medical causes first.
Talk with a vet
If your cat is vomiting more than you would like and you want help deciding on next steps, our vets can review your diary, photos, or videos by video consult. Book a consult at dialavet.com. Repeated vomiting in one day, blood, lily exposure, or a cat that cannot keep water down should go straight to a clinic.
References
- Cornell Feline Health Center. Vomiting in cats.
- Merck Veterinary Manual. Vomiting in small animals.
- International Cat Care. Vomiting and hairballs.
- ASPCA Animal Poison Control. Lilies and cats.
Disclaimer: Educational only. This page does not replace an examination or advice from your own veterinarian. If your cat is vomiting repeatedly or cannot keep water down, contact a veterinary hospital immediately.
