Quick answer: Cats throw up for many reasons, from hairballs and eating too fast to parasites, swallowed objects and illnesses such as kidney or thyroid disease. A single episode in a cat that is otherwise bright and eating is often not serious. Vomiting more than once a week, or with lethargy, poor appetite, diarrhea or blood, needs a vet visit.
You hear that unmistakable sound from the next room, and a moment later you find a small pile on the rug. So why is my cat throwing up, and should I be worried? The honest answer is that it depends on how often it happens, what comes up and how your cat seems otherwise. This guide walks through the common causes of vomiting in cats, the difference between a one-off and a pattern, simple steps you can take at home, and the warning signs that mean it is time to call your vet.
Is it normal for cats to throw up?
Occasional vomiting is common in cats. The Cornell Feline Health Center says that even the healthiest cat is apt to vomit now and then, and that in many cases there is nothing to be concerned about. VCA Animal Hospitals agrees that cats vomit quite readily and that occasional vomiting in an otherwise healthy cat may not mean anything is wrong, particularly if what comes up is mainly hair.
What matters is the pattern. Cornell advises that cats that vomit more often than once a week, or that vomit and also show other signs of illness, should be seen by a veterinarian promptly. A single episode in a bright, hungry cat is very different from repeated vomiting in a cat that is hiding and refusing food.
Vomiting, regurgitation or coughing?
Before you work out the cause, it helps to know what you actually saw. VCA explains that true vomiting usually starts with nausea: the cat may seem restless, lick their lips, drool or swallow repeatedly, and then you see strong heaving of the belly. Regurgitation is more passive. Food comes back up quickly, often right after eating, without that abdominal effort, and it usually points to a problem in the esophagus. Coughing can also bring up a little froth; VCA notes that coughing cats typically crouch and stretch their neck out. If you are not sure which one you saw, a short phone video is very helpful for your vet.
Common reasons cats throw up
Both Cornell and VCA list a wide range of causes. Some are minor and some are serious, which is why the other signs around the vomiting matter so much.
Hairballs
Cats swallow hair when they groom, and hairballs are one of the most common and usually benign reasons for vomiting. Cornell notes that it is not uncommon for a cat to bring up a hairball every week or two without lasting problems. VCA is a little more cautious and suggests contacting your vet if your cat vomits hairballs more than once a month. Either way, frequent hairballs are worth a conversation. Our guide on how to prevent hairballs in cats covers brushing and other practical steps.
Eating too fast or eating the wrong thing
VCA calls it dietary indiscretion: eating plants, table scraps, spoiled food or foul-tasting things such as some insects. Cornell adds poisonous plants, human medicines, string or yarn, antifreeze, chocolate, onions and small objects such as rubber bands and paper clips. Some of these are emergencies. String and other foreign objects can cause a blockage, and many plants and household chemicals are toxic. If you suspect your cat has eaten something like this, call your vet straight away rather than waiting to see what happens. Our list of holiday plants that are toxic to cats is a good place to start cat-proofing.
Food intolerance and diet changes
VCA lists intolerance or allergy to certain ingredients as a cause of minor stomach upset. A sudden switch to a new food can also unsettle some cats, which is why vets usually suggest changing diets gradually.
Parasites and gut conditions
Intestinal parasites, constipation and inflammatory bowel disease all appear on Cornell’s list. These usually cause vomiting that keeps coming back rather than a single episode.
Illness elsewhere in the body
Vomiting is not always about the stomach. Cornell and VCA both name metabolic and organ conditions, including kidney disease, liver disease, diabetes and thyroid disease, as well as pancreatitis, infections, urinary obstruction and cancer. Some of these also cause increased thirst, which is why our article on why a cat drinks so much water is worth a read if you have noticed both.
What the vomit and your cat’s behavior can tell you
The table below is a rough guide only. It cannot diagnose your cat, but it can help you decide how quickly to call your vet.
| What you see | Possible meaning | What to do |
|---|---|---|
| A single hairball, cat bright and eating | Normal grooming hair | Monitor; brush regularly |
| Undigested food soon after a fast meal, cat otherwise well | Eating too fast or regurgitation | Smaller meals; mention it to your vet if it repeats |
| Vomiting more than once a week | Possible underlying condition | Book a vet visit (Cornell) |
| Vomiting plus lethargy, poor appetite or diarrhea | Illness that needs a diagnosis | See your vet promptly |
| Blood in the vomit, or suspected string, toy or toxin | Possible injury, blockage or poisoning | Call your vet or an emergency clinic now |
| Repeated retching with nothing coming up | Possible blockage or serious illness | Seek veterinary care urgently |
When should you call the vet?
VCA notes that many cases of sudden vomiting settle on their own within 24 hours. But it advises seeking veterinary care immediately if your cat is vomiting and also has any of the following:
- Fever or lethargy
- Loss of appetite
- Belly pain
- Diarrhea
- Signs of dehydration
- Blood in the vomit
- A suspected swallowed object or toxin
Cornell adds weakness, increased thirst, and increased or decreased urination to the list of signs that need a prompt vet visit. VCA also recommends a vet check if your cat seems well but keeps vomiting for more than one to two days, because ongoing vomiting can lead to dehydration and electrolyte problems.
What happens at the vet
Cornell describes the usual approach: a detailed history from you, a physical exam, then blood work and a stool test to look for toxins, parasites and metabolic disease. If those are normal, X-rays or ultrasound may follow to look for foreign objects or masses. Treatment depends on the cause and can include fluids, anti-nausea medicine, a bland diet, deworming, or removal of a foreign object.
How to help a cat that threw up once
If your cat has vomited once and otherwise seems completely normal, these steps can help. Always follow your vet’s advice over general tips, and never give human medicines unless your vet prescribes them.
- Watch closely for a few hours. Note whether your cat is alert, interested in food and using the litter box normally.
- Keep fresh water available. VCA stresses that water should be freely available to prevent dehydration.
- Ask your vet about a bland diet. VCA says vets usually advise an easily digested, bland diet in small, frequent portions, then a slow return to the normal food over several days.
- Slow down fast eaters. Smaller, more frequent meals or a puzzle feeder can help cats that gulp their food.
- Remove temptations. Put away string, hair ties, toxic plants and trash. Our Halloween cat safety tips cover many common household hazards.
- Give them a calm place to rest. A soft bed in a quiet room helps a queasy cat settle. A washable pad such as our Teddy Fleece Cat Pad makes clean-up easy, and a covered hideaway like the Pop-Up Cat Play Tent gives a nervous cat somewhere to retreat.
How to reduce vomiting in the future
- Brush regularly to cut down on swallowed hair, especially in long-haired cats and during shedding season.
- Change foods gradually rather than switching overnight.
- Cat-proof your home by keeping string, ribbons, medicines, cleaning products and toxic plants out of reach.
- Keep up with parasite prevention and yearly checkups, so problems like kidney or thyroid disease are found early. Our senior cat care guide explains why older cats benefit from more frequent visits.
- Reduce stress with predictable routines, play and hiding spots. See our guide to the signs of stress in cats.
A soft, washable spot to recover
When your cat feels off, a quiet and cozy place to rest helps. Our Teddy Fleece Cat Pad is plush, warm and easy to wash.
Frequently asked questions
Why is my cat throwing up but acting normal?
A single episode in a cat that is otherwise bright, eating and using the litter box is often caused by a hairball or eating too fast. Watch your cat closely, and call your vet if it happens again, lasts more than a day or two, or other signs appear.
How often is it normal for a cat to throw up?
Cornell advises a prompt vet visit for cats that vomit more than once a week. VCA suggests contacting your vet if hairballs come up more than once a month.
Why does my cat throw up right after eating?
Food that comes up quickly with no heaving may be regurgitation, which can point to eating too fast or a problem in the esophagus. Smaller meals can help, but repeated episodes should be checked by your vet.
Should I feed my cat after they throw up?
Keep fresh water available and ask your vet for advice. VCA says vets often recommend a bland, easily digested diet in small, frequent portions, then a slow return to the usual food.
When is cat vomiting an emergency?
Call your vet or an emergency clinic right away if there is blood in the vomit, your cat may have swallowed string, a toy or a toxin, keeps retching without bringing anything up, or is lethargic and refusing food.
Can hairballs cause vomiting in cats?
Yes. Hairballs are one of the most common causes of vomiting in cats. Regular brushing helps reduce the amount of hair your cat swallows.
Keep reading
- Cat hairballs: how to prevent them and when to worry
- Why is my cat drinking so much water?
- Holiday plants toxic to cats
- Senior cat care: how to care for an older cat
Sources
This article is general information, not veterinary advice. If you are worried about your cat’s health, contact your veterinarian.
