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Why is my cat vomiting? Most single episodes come from a hairball, eating too fast or a sudden food change, and a cat that vomits once and then acts normally can usually be watched at home. Call a vet the same day for repeated vomiting, blood, lethargy, refusing food or water, belly pain, or any chance your cat swallowed string, a toxin or a lily. Cornell University’s Feline Health Center says cats that vomit more often than once a week should be evaluated by a veterinarian.
Updated October 2026. General information, not veterinary advice. We are not veterinarians, and this page cannot diagnose your cat.
📋 Table of Contents
- Call a Vet Now If You See Any of These
- Vomiting Versus Regurgitation
- How Often Is Too Often for a Cat to Vomit?
- Common Causes of Cat Vomiting
- What Your Cat's Vomit Looks Like: A Quick Guide
- The Hairball Question
- Vomiting After Eating, and Eating Too Fast
- Vomiting by Life Stage: Kittens, Adults and Seniors
- Toxins and Swallowed Objects to Rule Out
- Helping Your Cat at Home After One Mild Episode
- What a Vet May Do
- Reducing Stress and Keeping Cats Hydrated
- Gear That Helps With Eating Too Fast, Hydration and Hairballs
- Frequently Asked Questions
- More Cat Health Guides
- Sources We Checked
Call a Vet Now If You See Any of These
- Vomiting several times in a few hours, or a cat that cannot keep water down
- Blood in the vomit (bright red or dark like coffee grounds)
- Lethargy, weakness, hiding, a hunched posture or a swollen, painful belly
- Straining, retching with nothing coming up, or a known or suspected swallowed string, ribbon, hair tie or small object
- Vomiting along with diarrhea, increased thirst, or a change in how much your cat urinates
- Any chance your cat chewed a lily, took a human medicine or licked a cleaning product
If your cat may have swallowed something toxic, call your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435 right away (a consultation fee may apply). Do not try to make your cat vomit at home unless a vet tells you to; for some poisons, vomiting can cause more harm.
Vomiting Versus Regurgitation
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True vomiting is active: your cat heaves, drools or retches first, and what comes up is usually partly digested food, bile or foam. Regurgitation is passive. Food comes back up with little warning, often undigested and tube-shaped, soon after eating. Regurgitation points more toward the esophagus or eating too fast, while vomiting starts in the stomach or intestines. Telling your vet which one you saw (and filming it, if you can) is a useful clue.
How Often Is Too Often for a Cat to Vomit?
Cornell Feline Health Center describes a hairball every week or two as a common and often benign event, but advises a prompt veterinary exam for cats that vomit more often than once a week, or that also show lethargy, weakness, decreased appetite, blood in the vomit, increased thirst, changes in urination or diarrhea. The Merck Veterinary Manual lists long-term vomiting, vomiting more than once or twice a day, blood, abdominal pain, dehydration, weakness, fever or weight loss as reasons for immediate evaluation. A simple rule: an occasional single episode in a bright, eating cat can be watched; weekly or more, or any red flag above, deserves a vet visit.
Common Causes of Cat Vomiting
Hairballs are the classic cause, especially in long-haired cats and avid groomers. Eating too quickly, sudden diet changes, food intolerance and spoiled food can all irritate the stomach. Cornell and Merck also list more serious causes: intestinal parasites, constipation, infections, pancreatitis, inflammatory bowel disease, diabetes, kidney disease, hyperthyroidism, liver problems, tumors, medications, poisons and swallowed foreign objects such as string.
Because the list runs from trivial to life-threatening, the pattern and the other signs matter more than the vomit itself.
What Your Cat’s Vomit Looks Like: A Quick Guide
Appearance alone cannot diagnose a cause, but it helps you decide how fast to act. Treat this table as a general guide and describe what you saw to your vet.
| What you see | Often linked to | Watch at home or call a vet? |
|---|---|---|
| Clear liquid or white foam | Empty stomach, mild irritation, drinking too fast | Watch if it happens once and your cat acts normal; call if it repeats |
| Yellow or green foam (bile) | Long gap between meals, irritated stomach | Watch if rare; call if it repeats or your cat is off food |
| Undigested food soon after eating | Eating too fast, food change, regurgitation | Try smaller meals or a slow feeder; call if it continues |
| Tube-shaped clump of fur | Hairball | Normal if occasional; call if weekly or if the cat retches without producing one |
| Grass or plant pieces | Nibbling plants | Check that the plant is safe; call if vomiting repeats |
| Pink or red streaks, or dark coffee-ground look | Blood from the stomach or throat | Call a vet promptly |
| Vomit with a strong fecal smell | Possible blockage further down the gut | Call a vet right away |
| Repeated vomiting with lethargy | Obstruction, toxin or systemic illness | Seek veterinary care urgently |
The Hairball Question
Hairballs form when a cat swallows loose fur while grooming and some collects in the stomach. Cornell says an occasional hairball, even one every week or two, is common and usually benign. Frequent hairballs, or gagging that produces nothing, can mean over-grooming, skin irritation or a digestive problem, so mention it to your vet. Regular brushing reduces the fur your cat swallows. See our guides on cat food for hairballs and hairball treats for cats for supportive options.
Vomiting After Eating, and Eating Too Fast
Cats that gulp their food often bring it straight back up. Smaller, more frequent meals, a wide shallow plate, a puzzle feeder or a slow-feeder bowl can pace eating. Change foods gradually over seven to ten days, mixing in more of the new food each day. If your cat keeps vomiting on a bland, familiar diet, a food intolerance or illness is more likely than a feeding-speed problem, which is a reason to see your vet. Our sensitive-stomach cat food guide and cat lick mat slow feeders cover gentler feeding options.
Vomiting by Life Stage: Kittens, Adults and Seniors
- Kittens: small bodies lose fluid quickly, so repeated vomiting or loss of appetite in a kitten should be checked sooner rather than later.
- Adult cats: hairballs, fast eating, diet changes and plant chewing are the usual suspects, along with stress.
- Senior cats: chronic vomiting can go with kidney disease, hyperthyroidism, inflammatory bowel disease or other conditions that Cornell and Merck list, so ongoing vomiting in an older cat is not something to wait out.
Toxins and Swallowed Objects to Rule Out
- Lilies: the ASPCA lists lilies as toxic to cats, with kidney failure as the clinical sign. Treat any chewing of a lily as an emergency and call a vet or poison control.
- String, ribbon, hair ties, tinsel and small objects: Cornell and Merck list string and other foreign objects as causes of vomiting. A cat that vomits repeatedly after playing with string needs prompt care.
- Human medicines: the ASPCA warns that ibuprofen and naproxen can be quite toxic to cats and that acetaminophen damages red blood cells. Never give a human pain medicine; if your cat seems to be in pain, call your vet. Our guide to signs your pet is in pain explains what to look for.
- Plants, essential oils, antifreeze, chocolate and onions: Cornell names several of these as causes of poisoning-related vomiting. Keep them out of reach.
Helping Your Cat at Home After One Mild Episode
If your cat vomited once, is bright and alert, and still wants to eat, you can usually watch closely at home.
- Keep fresh water available. The Merck Veterinary Manual advises against withholding water unless a vet is giving fluids.
- Do not make fasting your own plan. Cats that stop eating can develop a serious liver condition called hepatic lipidosis, which Cornell links to loss of appetite and says needs prompt treatment; overweight cats and cats with diabetes or other illness are at higher risk. Merck notes that vets sometimes withhold food for a short period (up to 24 hours) in short-term vomiting, but that is a decision to make with your vet.
- Offer normal food in small portions once your cat has stopped vomiting. If you are unsure whether a bland diet is appropriate, ask your vet, who may suggest a sensitive-stomach or veterinary diet.
- Call your vet if your cat will not eat, vomits again or seems unwell.
- Do not give human medicines such as ibuprofen or acetaminophen, and do not induce vomiting.
Skin-tent checks for dehydration (lifting the skin between the shoulder blades) are not reliable in thin or older cats, so judge by behavior, drinking and appetite and call your vet if you are unsure. Our guide to why a cat stops eating covers appetite loss in more detail.
What a Vet May Do
Merck lists blood, fecal and urine tests, abdominal X-rays and ultrasound as common steps, and endoscopy with biopsy when a definite diagnosis is needed. Keep a short log of when your cat vomits, what it looks like, what your cat ate and any changes in appetite, energy or litter box habits. Changes in stool or urine can be early clues, so watch the box too: our litter box guide shows a routine that makes changes easier to spot.
Reducing Stress and Keeping Cats Hydrated
Stress from a move, a new pet or a disrupted routine can upset some cats’ stomachs, so a predictable feeding schedule, quiet resting places and daily play help. Many cats drink more from moving water, and good hydration matters whenever a cat has been vomiting. See our pet water fountain guide and stainless steel cat water fountains.
Gear That Helps With Eating Too Fast, Hydration and Hairballs
None of these treat vomiting. They address common triggers such as gulping, low water intake and swallowed fur. If vomiting continues, see your vet rather than shopping for a fix.
Catstages Kitty Slow Feeder Bowl – Best for cats that gulp dry or wet food
Catstages Kitty Slow Feeder Bowl for Cats & Kittens, 3/4 Cup, Blue, 5" | Wet or Dry Food, Puzzle Dish, Slows Fast Eaters, Aids Digestion, Interactive Enrichment, Non-Slip, No BPA, Dishwasher-Safe
Included for 'Why Is My Cat Vomiting? Causes and When to Call a Vet' as a representative home product in this roundup; selection reflects the product set returned for this topic.
View on AmazonA low, ridged dish makes your cat work around obstacles, which slows each bite. It suits cats that vomit shortly after meals. Skip it if: your cat vomits even on small, slow meals, which needs a vet visit.
Vancasso Ceramic Slow Feeder Cat Bowl – Best for a tilted, easy-to-wash bowl
vancasso Ceramic Slow Feeder Cat Bowl, 6.25 Inch Elevated Cat Slow Feeder Bowl, Anti Vomiting for Dry and Wet Food, White
Included for 'Why Is My Cat Vomiting? Causes and When to Call a Vet' because the listing lists an explicit depth/thickness, which is the attribute this article compares.
View on AmazonA shallow, raised ceramic bowl with a built-in slow-feeding pattern that is easy to wash. Skip it if: your cat prefers a flat dish, since some cats dislike raised bowls.
Veken Stainless Steel Cat Water Fountain – Best for encouraging drinking
Veken Innovation Award Winner Stainless Steel Cat Water Fountain, 108oz, C1 | Automatic Pet Fountain Dog Water Dispenser with 3 Replacement Filters & Silicone Mat, Gifts for Cats, Dogs (Silver)
Included for 'Why Is My Cat Vomiting? Causes and When to Call a Vet' as a representative home product in this roundup; selection reflects the product set returned for this topic.
View on AmazonMoving water appeals to many cats, and a stainless steel basin is easier to keep clean than many plastic designs. Skip it if: you will not clean and refill it regularly.
SleekEZ Cat Deshedding Brush – Best for cutting down swallowed fur
SleekEZ Cat Brush for Shedding - Deshedding Brush for Cats - Patented Grooming Tool for Removing Loose Fur, Undercoat & Hair - Made in USA - Works on Short, Medium & Long Coats
Included for 'Why Is My Cat Vomiting? Causes and When to Call a Vet' as a representative home product in this roundup; selection reflects the product set returned for this topic.
View on AmazonRegular brushing removes loose undercoat before your cat can swallow it. Skip it if: your cat has painful skin or mats, and check with your vet before brushing sore areas.
Frequently Asked Questions
Why is my cat vomiting yellow foam?
Yellow foam is usually bile from an empty stomach. Call a vet if it repeats or comes with lethargy or loss of appetite. Smaller, more frequent meals can help when a long gap between meals is the cause.
Why is my cat vomiting after eating?
Eating too fast, a food change or intolerance are common causes. Try smaller meals or a slow feeder, and see a vet if it continues or your cat loses weight.
Is it normal for a cat to throw up once a week?
Not something to ignore. Cornell says cats that vomit more often than once a week should be evaluated by a veterinarian, even if they otherwise seem fine.
Should I feed my cat after vomiting?
Offer small amounts of normal food once vomiting has stopped, and ask your vet before any fasting. Cats that stop eating can develop liver problems, so call your vet if your cat refuses food.
Can a cat vomit and still be fine?
Yes. One episode in a cat that is alert, drinking and eating is often minor. Watch for repeat vomiting, lethargy or appetite loss, and call your vet if any appear.
Could my cat be vomiting from a hairball if nothing comes up?
Possibly, but unproductive retching can also signal nausea, asthma or an obstruction. If it is frequent or your cat seems distressed, have a vet examine your cat.
Can I give my cat human medicine for vomiting or pain?
No. The ASPCA warns that ibuprofen, naproxen and acetaminophen can be toxic to cats. Call your vet before giving any medicine.
More Cat Health Guides
- Why Is My Cat Not Eating? 8 Common Reasons
- Signs Your Pet Is in Pain (and What to Do)
- Pet First Aid Kit Essentials
- How to Clean a Litter Box Properly
- Best Cat Food for Cats with Sensitive Stomach
Sources We Checked
- Cornell University Feline Health Center, Vomiting in Cats (page last updated 2021): vet visit threshold of more than once a week, hairballs, causes.
- Cornell University Feline Health Center, Hepatic Lipidosis: loss of appetite and risk factors.
- Merck Veterinary Manual, Vomiting in Cats (owner version): when to seek evaluation, food and water management, diagnostic tests.
- ASPCA Animal Poison Control: lilies toxic to cats; human pain medicines; poison control number (888) 426-4435.
How we write this guide: we summarize published veterinary guidance; we do not diagnose or test. Check with your own veterinarian about your cat.
