Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

Why Is My Cat Throwing Up Undigested Food? Our Vet Explains 6 Potential Causes

Share

If you’ve owned a few cats, chances are you’ve cleaned up your fair share of cat vomit. Vomiting in cats is very common and can be innocent, but it can also be a sign of underlying illness. So why do cats throw up? And how do you know if your cat’s vomiting warrants a check-up at your veterinary clinic?

divider cat paws oct 2024

Why Is My Cat Vomiting?

Cats vomit for many different reasons, and some cats are very prone to it. If you have a cat throwing up undigested food but acting normal and seems otherwise well, this is unlikely to be a concern. However, if it is yellow bile or froth that is brought up, or if your cat has other signs of being unwell, it shouldn’t be ignored and veterinary advice should be sought. Here are some of the reasons why cats vomit.

Why Is My Cat Throwing Up Undigested Food?

1. Overeating

sphynx cat eating kibble from feeding bowl
Image Credit by: New Africa, Shutterstock

If your cat regularly gorges on food, quickly eating more than their stomach can comfortably contain, they may vomit the undigested food back up, reasonably soon after eating. Some cats are prone to this behavior, and it can happen regularly, even daily.

To try to combat your cat’s gorging, you must try to change the speed at which they eat. It can be tough to know how to make a cat eat slower, but there are some methods you can try. One of the most reliable methods would be using a slow feeder. Store-bought puzzle feeders or slow-feeders will help by making it trickier for your cat to get at the food so that they have to make more effort and aren’t able to guzzle.

If your budget is tight, you could try your own method of making a slow feeder by feeding from a flat plate rather than a bowl so that food moves around more and is, therefore, more of a challenge for your cat to eat. Failing that, you could try splitting meals into smaller amounts and feeding more frequently.


2. Regurgitation

Cat Vomiting vs Regurgitation Infographic
You are free to use this image but we do require you to link back to Catster.com for credit

It’s useful to know whether your cat is actually vomiting, or just regurgitating food since that will have an impact on the possible causes and treatments. If you see your cat bring up food, note whether there is any heaving or abdominal effort, or whether the food just seems to come up easily with no effort.

Regurgitation is normally a consequence of gorging behavior; however, some rare conditions affect the muscles and function of the food pipe (esophagus), which may lead to regurgitation.


3. Hairballs

Cat hairballs can be perceived as vomiting, and the process of bringing them up is much the same but rather than food or bile being brought up, it is clumps of hair. Hairballs are very common, especially in long-haired cats or lazy groomers!

One way to manage hairballs is to start a regular grooming routine with your cat. Some cats just don’t spend the necessary time on self-care and can build up excessive dead hair in their coat. By brushing this out regularly, you will reduce the chances of hairballs. If your cat doesn’t enjoy or even tolerate a grooming session from you, some products can help to bind and lubricate the hairball to help it to move through the guts.


4. Grass Eating

ginger cat eating grass outside
Image Credit by: StepanPopov, Shutterstock

You might have noticed your cat eating grass and then vomiting soon afterward. Or you may have seen grass blades within piles of vomit around your home. Cats often enjoy eating grass, but the shape and length of blades of grass can irritate the gag reflex, especially if some grass gets lodged in the throat.

Many people believe that cats will choose to eat grass when they feel sick in order to make themselves vomit. However, since we can’t ask them, there’s no way of knowing whether this is true or whether they just enjoy it.


5. Bowel Obstruction

Although cats are generally fussier than dogs and less likely to eat something they shouldn’t, occasionally they can take a fancy to something dangerous. Often, it’s just over-zealous playing that’s got slightly out of control when they swallow some tinsel or cotton thread. If this foreign material gets lodged in the guts, it can cause an obstruction, which leads to vomiting. If your cat is vomiting or unwell and you have a suspicion that they may have swallowed a foreign body, it’s really important to contact a veterinarian urgently.


6. Allergies

Just like humans, cats can have food allergies. In some cats, an ingredient in a standard cat food will cause an allergic reaction. This would commonly be a protein or carbohydrate source. If your cat has a cat food allergy, they may persistently vomit, lose weight, have diarrhea, and become lethargic. Your veterinarian will be able to do some tests to find out if an allergy is the cause and then recommend an appropriate hypoallergenic diet.

There are several hypoallergenic diets available on prescription, and the best results are often seen with these. However, a home-formulated hypoallergenic diet may be attempted under the supervision of your veterinarian and a veterinary nutritionist. A home-made hypoallergenic diet works by ensuring you only use protein and carbohydrate sources that your cat has never had previous exposure to. Diet changes will take around 8 weeks of strict adherence to make an impact, so don’t lose hope if you don’t see an instant improvement.

divider cat paws oct 2024

Frequently Asked Questions

Why is my cat vomiting undigested food?

The main cause of vomiting undigested food is gorging. If your cat eats too much, too quickly, the stomach becomes overstretched and vomiting occurs soon after feeding. To combat this, try to ensure your cat eats more slowly, or feeds little and often. Sometimes a simple change in your cat’s food dish can help eliminate this issue.

Is it normal for a cat to throw up every day? How bad is it?

Although it can be normal for a cat to vomit daily due to gorging food, there are other more concerning reasons why your cat could be vomiting. Seeking the reassurance of an examination by a veterinarian would be a good idea if your cat frequently vomits.

What can I give my cat for vomiting?

Unless you are certain that your cat is vomiting due to gorging food, it would not be sensible to attempt any home remedies to treat your cat’s vomiting without seeking veterinary advice. If you are sure that the vomiting is resulting from your cat being a bit greedy and guzzling food, try feeding small amounts frequently rather than larger meals.

How do I get my cat to eat slower?

Try feeding small amounts of food more frequently, or use a puzzle feeder or flat plate to make it more challenging for your cat to pick up the food.

divider cat paws oct 2024

So, Do I Need to Worry if I Have a Cat Throwing Up Undigested Food?

While it is always sensible to seek the advice of a veterinarian if you are concerned about your cat, there are some innocent reasons why your cat may be vomiting. Watch out for other signs that your cat is unwell, and consider whether your cat may be eating too fast or having trouble with hairballs. Ultimately, a quick call to the veterinary clinic will help to put your mind at ease if you are unsure.

Want more free vet advice? Check out some of our other Ask-a-Vet posts:

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.




How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.


Catster's Digital Magazine is Back!

Vet-approved health & behavior advice

Real cat stories & community features

Chatting About the Importance of Spaying/Neutering, Cat Retail Shopping Ban & Red-Level Storms | Chatty Cattys, Episode 30

In this episode of Catster’s Chatty Cattys podcast, Nicole and Dr. Karyn are celebrating a major legal win for pets before diving into...

Is Your Cat Happy? Here’s How You Can Tell

Cats have a reputation for being indifferent, even inscrutable. But despite their seemingly ambivalent appearance, cats experience many emotions, including happiness, and they...

Human Brains Age Like Cats – New Study Debunks the 7-Year Rule

If you’ve ever caught your senior cat staring blankly at a wall, wandering the halls at 3 am, calling out for no clear...

Chatting with Devin About Here! Have a Kitten, Fostering, & Why Two Are Better Than One | Chatty Cattys, Episode 29

In this episode of Catster’s Chatty Cattys podcast, Nicole & Dr. Karyn sit down with Devin, the founder and one-woman show behind “Here...

More related

We Talk to Megan Lynn Kott About Her “Cattoos!” Book

My favorite cat book of the year so far has fewer than 40 words in it (39, to be exact; yeah, I counted)....

9 Best Litter Boxes for Picky Cats in 2026 – Reviews & Top Picks

A litter box is an essential piece of equipment for any cat owner, but if your cat doesn’t like it, she won’t use...

10 Best Cat Treats for Picky Cats (2026) – Reviews & Top Picks

You spend hours at the pet store picking out the best treats for your cat, only for them to be rejected without so...

Trimming a Long-Haired Cat’s Bottom: 7 Vet-Verified Tips & Tricks

Owners of long-haired cats will know the struggle of keeping their cat’s bottoms clean. Poop and debris can easily get caught in the...

Keep reading

What’s a Lick Mat & Does It Help Cats? Pros, Cons & FAQ

A lick mat is a flat silicone or rubber mat with ridges and bobbles designed to slow your cat’s eating and provide mental stimulation during mealtimes, as pets have to work to free their food. They’re incredibly easy to use;...

How Do Cats Say Sorry? Vet-Verified Communication & Bonding Explained

Cats don’t say sorry the same way humans do, but they might show other relationship-building behaviors. They simply don’t have the same concept of apologies. Humans have a pretty complicated social system, and our social concepts do not always exist...

Sad-cat-lying-on-carpet

My Cat Has a Front Paw Limp, What’s Wrong? Vet Approved Advice

When you notice your cat limping or favoring a certain leg, it can trigger your alarm bells. The good news is that, in many cases, a limp is often temporary and may resolve on its own. In other cases, it...

cat sitting in park with one front leg lifted up

Do Cats Really Need Baths? Most Owners Get This Wrong

You’ve likely been scrolling through social media and seen a video of someone giving their cat a luxurious bath, complete with special shampoos and a blow-dry. You look at your own cat, sprawled on the couch, and wonder: Am I...

cat on top of bathtub

Does Catnip Help a Cat in Heat? Vet-Reviewed Facts & FAQ

There are a lot of old wives’ tales out there about how to deal with a cat in heat. One of the most traditional solutions is giving catnip. But does it actually work? Catnip is a member of the mint...

cat-eating-catnip

Can Cats Eat Turkey Bacon? Vet-Approved Risks & FAQ

Turkey and bacon are two legitimate meats in their own right, and each of these meats is popular with both humans and pets alike—even if our pets shouldn’t be eating them. Cats are known as obligate carnivores, meaning they must...

Can Cats Eat Turkey Bacon

Is Echeveria Poisonous to Cats? Vet Approved Facts & Safety Tips

Echeveria comprises about 150 different species of succulent plants from the Crassulaceae family. These plants are native to Texas and Argentina, but some varieties can be found in places like Hawaii. Echeveria plants tend to be part of many households...

Catster_Is Echeveria Poisonous to Cats

How to Sedate a Cat for Grooming: 3 Vet-Approved Methods

Some cats do not like being groomed, but if they’re long-haired or unable to groom themselves for any reason, grooming is a necessity. If their coat is not free of mats and tangles, it can tug uncomfortably on your cat’s...

groomer brushing a maine coon cat

Love Cats? So Do We! Join the Catster Community

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.




Sign up for the Catster Email Newsletter

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.