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

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.

If you need to speak with a vet but can't get to one, head over to PangoVet. It's an online service where you can talk to a vet online and get the advice you need for your pet — all at an affordable price!

PangoVet_Mention-in-Content for PangoVet2 save money


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:

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.

Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

Can Cats Eat BBQ Sauce? Vet-Reviewed Facts

Firing up your grill for a barbecue dinner, lunch, or snack is a delicious way to enjoy a meal. However, most barbecues typically...

13 Cat-Themed T-Shirts for Men: Best Choices for a Feline Lover

Buying cat-related merchandise is a great way to tell the people around you just how much you love your pets. Whether you’re sipping...

Why Is My Cat Licking All Her Fur Off? Vet Approved Reasons & Tips

Cats are perfectionists in grooming, dedicating plenty of time each day to removing loose hair, dirt, and other debris from their coats. Catching...

How to Keep a Collar on a Cat: 5 Vet-Verified Easy Tips & Tricks

Whether a breakaway or traditional product, keeping a collar on a cat can be quite a task for every pet owner. While most...

More related

Is A Devon Rex Hypoallergenic? What You Need To Know!

The Devon Rex is a popular breed due to their social, outgoing, and playful personality. They benefit from pet owners who can give...

Can Cats Eat Cereal? Vet-Verified Nutrition Facts & FAQ

If you can’t resist sharing the last of your cereal and milk with your cat, you might wonder if this is a good...

Why Does My Kitten Bite Me? 5 Common Reasons

Kittens always look cute but they do not always play cute. These rascally little animals love to roughhouse and explore the limits that...

Scottish Fold Tabby: Info, Pictures, Facts & History

The Scottish Fold is one of the rarest and most unique-looking felines one could have as a pet. It is so named because...

Keep reading

Cat Ear Mites vs Earwax: Vet-Reviewed Ways to Tell the Difference

Earwax is entirely normal. Ear mites, on the other hand—not so much. If your cat has ear mites, they will require veterinary care. While ear mites aren’t often serious, they can cause extreme itching, discomfort, and even skin lesions if...

cat ear mites vs cat earwax featured image

Does Vacuuming Kill Fleas on Cats? Vet-Reviewed Facts & Advice

Cats are beautiful creatures, but the fact that they have bodies full of fur cannot be ignored. Some have short hair that rarely needs to be brushed, while others must be brushed daily. No matter the cat’s fur type, we...

cat near vacuum

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

Can Cats Eat Capers? Vet-Reviewed Facts & FAQ

Capers are known for adding a certain “pizazz” to many meals including pasta, salads, fish, and bagels. These small and savory flower buds have been around since the mid-17th century and have become a mainstay ingredient in many Italian dishes....

Can Cats Eat Capers

Carrageenan In Cat Food: Vet-Reviewed Uses, Safety & Verdict

If you’re a cat owner who likes to read pet food labels, you’ll probably come across some ingredients you don’t recognize. Since you don’t want to feed your cat anything toxic or unsafe, your next step is to research unfamiliar...

bengal cat eating wet or pate food

How to Safely Burn Incense Around Cats: 3 Vet-Approved Tips

Incense is a plant material that gives off certain scents when burned, and it’s been around for centuries. People use it for multiple purposes, such as meditation, getting rid of negative energy, relaxation, and aromatherapy. Incense is deeply embedded within...

lighted incense stick

7 Best Cat Foods for Weight Gain (High Calorie) in 2025 – Reviews & Top Picks

Some cats are notoriously picky. No matter what food you put out for them, they turn up their noses and walk away from the food bowl. With hundreds of products available, you may struggle to select the right one for...

persian cat eating dry food from bowl

Why Does My Cat Keep Meowing and Rubbing Against Everything? 6 Vet-Reviewed Reasons

If you have ever noticed a cat’s affectionate side, you may have seen their tendency to rub their faces on their owners or against their favorite objects. Or you notice a cat who raises their backside when they pass by...

grey cat rubbing againts its owners leg