Cat Throwing Up? 9 Causes and When to Worry

A cat throwing up may have experienced something relatively minor, such as eating too quickly or bringing up a hairball. But vomiting can also be a sign of a health problem that needs veterinary attention.

An isolated episode does not always mean something serious is wrong. However, frequent cat vomiting, repeated episodes, or vomiting accompanied by changes in appetite, energy, behavior, thirst, urination, or bowel movements deserves closer attention.

This article is for educational purposes only and does not replace an examination by a veterinarian. The information below can help you understand what may be happening and what signs to watch for, but only a veterinary professional can diagnose the cause of your cat’s vomiting.

Is It Normal for a Cat to Throw Up?

Not necessarily—but an occasional episode can happen even in an otherwise healthy cat.

A cat might vomit after eating too quickly, because of a hairball, or after something has irritated the digestive system. One isolated episode in a cat that remains active, alert, and interested in food and water may not always require emergency care.

What matters most is the overall picture.

According to the Cornell Feline Health Center, cats that vomit more frequently than once per week or have other signs such as lethargy, weakness, decreased appetite, blood in the vomit, increased thirst, changes in urination, or diarrhea should be evaluated by a veterinarian.

Even if you see hair in the vomit, repeated episodes should not automatically be blamed on hairballs.

Vomiting vs. Regurgitation in Cats: What’s the Difference?

Vomiting and regurgitation can look similar, but they are not the same process.

Vomiting is active. A cat may drool, swallow repeatedly, appear nauseated, retch, and contract the abdominal muscles before bringing up food, fluid, foam, or bile.

Regurgitation is generally passive. Food or fluid comes back up with little or no abdominal effort, and the material is often undigested. It may even have a tubular shape because it has been sitting in the esophagus rather than the stomach.

The Merck Veterinary Manual specifically distinguishes vomiting from regurgitation this way.

Knowing whether your cat is vomiting or regurgitating can give your veterinarian useful information when investigating the cause.

9 Common Causes of a Cat Throwing Up

There are many possible reasons for cat vomiting. The causes below are among the more common possibilities, but this list should not be used to diagnose your cat at home.

1. Eating Too Fast

Some cats practically inhale their meals.

Eating a large amount of food very quickly may be associated with food coming back up soon afterward. This can be especially noticeable in multi-cat households where a cat feels pressure to finish before another pet approaches the bowl.

If your cat throws up after eating, pay attention to how soon it happens after the meal and whether your cat showed signs of nausea or abdominal contractions beforehand.

That distinction is important because undigested food coming back up immediately after eating may sometimes be regurgitation rather than true vomiting.

For cats that simply eat too quickly, smaller meals or a slow-feeding bowl may help.

However, if your cat repeatedly brings food back up, the problem should not automatically be blamed on eating speed. Persistent episodes deserve veterinary evaluation.

2. Hairballs

Hairballs are one of the most familiar explanations for a cat throwing up.

Cats swallow loose hair while grooming. Most swallowed hair passes through the digestive system and leaves the body in the stool, but some may accumulate in the stomach and eventually be expelled as a hairball.

Hairballs often look like damp, elongated clumps of hair rather than round balls.

Cornell notes that bringing up an occasional hairball can occur in healthy cats. However, frequent retching or vomiting should not automatically be considered a harmless hairball problem because similar signs can occur with other gastrointestinal or even respiratory conditions.

Regular brushing can help reduce the amount of loose hair your cat swallows, particularly in long-haired cats or during periods of heavy shedding.

3. A Sudden Change in Food

A sudden dietary change can upset a cat’s digestive system.

Switching abruptly from one food to another, introducing unfamiliar treats, or allowing your cat to eat spoiled or inappropriate food may be associated with digestive upset.

When changing your cat’s regular diet, transitioning gradually is generally preferable to replacing the old food all at once.

If vomiting began soon after a food change, make a note of:

• what food was changed;
• when the change occurred;
• how much your cat ate;
• whether there is also diarrhea;
• whether your cat is still eating normally.

Tell your veterinarian about any recent dietary changes if the vomiting continues.

4. An Empty Stomach or Long Gaps Between Meals

Some cats may vomit yellowish fluid when their stomach is empty.

The yellow color is often associated with bile, but yellow vomit does not prove that hunger is the cause.

If the episodes consistently occur after long periods without food, your veterinarian may want to consider the feeding schedule as part of the overall history.

In some cases, dividing the daily amount of food into smaller, more frequent meals may be useful—but recurrent vomiting should still be investigated rather than assumed to be caused only by an empty stomach.

5. Food Intolerance or Sensitivity

Some cats may react poorly to particular foods or ingredients.

Vomiting associated with diet can have several possible explanations, including food intolerance or an adverse reaction to certain ingredients.

The Merck Veterinary Manual includes food allergy among the potential causes of vomiting in cats.

Identifying a dietary trigger can be difficult and should ideally be done with veterinary guidance rather than by repeatedly changing foods at home.

If your veterinarian suspects a food-related problem, they may recommend a controlled diet trial or another nutritional approach.

6. Eating Plants, String, or Foreign Objects

Cats are curious animals, and that curiosity can sometimes get them into trouble.

A cat may chew or swallow things such as:

• houseplants;
• string;
• yarn;
• ribbon;
• rubber bands;
• small toys;
• pieces of plastic;
• other household objects.

Some plants and substances are toxic to cats, while swallowed objects can irritate or block the gastrointestinal tract.

Cats are particularly vulnerable to linear foreign bodies, such as string or yarn, which can become trapped in the digestive tract and cause a potentially life-threatening obstruction.

If you suspect your cat swallowed a foreign object or was exposed to something toxic, contact a veterinarian promptly.

Do not try to make your cat vomit at home unless a veterinary professional specifically instructs you to do so.

And if you see string coming from your cat’s mouth or anus, do not pull on it. Seek veterinary care.

7. Intestinal Parasites

Parasites are another possible cause of vomiting in cats.

The Merck Veterinary Manual lists internal parasites among the potential causes of feline vomiting.

Other signs may occur at the same time, including:

• diarrhea;
• changes in appetite;
• weight loss;
• poor body condition;
• changes in stool.

Kittens and cats with greater exposure to the outdoors may face particular parasite risks, although indoor cats are not automatically protected from every parasite.

Diagnosis may involve a physical examination, stool testing, or other tests recommended by the veterinarian.

Avoid giving deworming medication simply because vomiting is present. The appropriate treatment depends on the parasite involved and the individual cat.

8. Gastrointestinal Inflammation or Disease

When a cat keeps throwing up, the cause may involve the gastrointestinal tract itself.

Possible problems include conditions affecting the stomach or intestines, inflammatory gastrointestinal disease, constipation, infections, obstruction, or other digestive disorders.

Merck notes that signs of digestive disease can include vomiting or regurgitation, loss of appetite, diarrhea, constipation, abdominal pain, dehydration, and bleeding.

Your veterinarian may recommend tests depending on your cat’s history and symptoms, such as:

• bloodwork;
• fecal testing;
• urinalysis;
• X-rays;
• abdominal ultrasound;
• other diagnostic procedures.

Repeated vomiting is a symptom, not a diagnosis. Finding the underlying cause is what determines the appropriate treatment.

9. Diseases That Don’t Start in the Stomach

Not every case of cat vomiting begins in the digestive tract.

Vomiting can also occur with diseases affecting other organs and body systems.

Veterinary references list conditions such as:

• kidney disease;
• liver disease;
• pancreatitis;
• diabetes;
• hyperthyroidism;
• certain infections;
• some tumors.

Cornell specifically lists kidney disease, diabetes, hyperthyroidism, gastrointestinal growths, parasites, foreign objects, and several gastrointestinal conditions among possible causes of feline vomiting.

This becomes particularly important when vomiting appears along with other changes such as:

• weight loss;
• increased thirst;
• increased or decreased urination;
• reduced appetite;
• weakness;
• lethargy;
• significant changes in behavior.

If you notice several changes at the same time, tell your veterinarian about all of them—even if they do not seem related.

What Can the Appearance of Cat Vomit Tell You?

The appearance of vomit can provide useful clues, but you cannot reliably diagnose the cause based on color or appearance alone.

Here are some common observations.

Cat Throwing Up Undigested Food

Food that looks almost unchanged may be seen when material comes back up shortly after eating.

It is especially important in this situation to distinguish between vomiting and regurgitation.

If your cat keeps throwing up food, particularly after most meals, veterinary evaluation is appropriate.

Cat Throwing Up White Foam

White foam may contain stomach fluid mixed with air.

It can occur for different reasons and does not by itself tell you whether the problem is minor or serious.

A single episode must be interpreted together with your cat’s behavior, appetite, hydration, and any other symptoms.

Repeated episodes should be discussed with a veterinarian.

Cat Throwing Up Yellow Liquid

Yellow liquid often contains bile.

However, the presence of bile does not automatically mean your cat is vomiting because they are hungry.

Pay attention to whether the vomiting repeatedly occurs at a particular time, how often it happens, and whether your cat has other symptoms.

Cat Throwing Up Hair

Visible hair may be consistent with a hairball.

An occasional hairball can occur, but persistent vomiting or repeated unproductive retching should not simply be attributed to hairballs.

Blood in Cat Vomit

Blood in vomit is a warning sign and should be taken seriously.

Blood may appear red, or digested blood may have a darker appearance.

Contact a veterinarian promptly if you notice blood in your cat’s vomit.

What Should You Watch Before Calling the Veterinarian?

If your cat has vomited, gathering a few details can help your veterinarian understand what is happening.

Try to note:

• how many times your cat vomited;
• when the vomiting started;
• whether it happens before or after eating;
• how long after eating it occurs;
• what the vomit looks like;
• whether food appears digested or undigested;
• whether you see hair, foam, yellow fluid, blood, or an unusual object;
• whether your cat is eating normally;
• whether your cat is drinking more or less than usual;
• whether urination has changed;
• whether your cat has diarrhea or constipation;
• whether your cat is using the litter box normally;
• whether your cat has lost weight;
• whether energy or behavior has changed;
• whether your cat may have reached a plant, medication, chemical, string, or another object.

If possible, taking a photo of the vomit can also be helpful.

A short video of an episode may help your veterinarian distinguish vomiting, regurgitation, coughing, or retching if you are unsure what you are seeing.

When Should You Worry About a Cat Throwing Up?

Contact a veterinarian promptly if your cat:

• vomits repeatedly in the same day;
• continues vomiting or has episodes that frequently return;
• has blood in the vomit;
• becomes unusually weak or lethargic;
• refuses food;
• appears painful;
• develops diarrhea along with vomiting;
• appears dehydrated;
• is losing weight;
• has significant changes in thirst or urination;
• may have swallowed a foreign object;
• may have eaten or contacted a toxic substance.

Merck advises a detailed veterinary examination for long-term vomiting, vomiting occurring more than once or twice daily, or vomiting accompanied by blood, abdominal pain, depression, dehydration, weakness, fever, weight loss, or other concerning signs. VCA similarly recommends immediate veterinary care when vomiting occurs with signs such as lethargy, appetite loss, abdominal pain, diarrhea, dehydration, blood, or suspected ingestion of a toxin or foreign object.

When Is Cat Vomiting an Emergency?

Some situations deserve especially urgent attention.

Seek veterinary care quickly if:

• your cat may have been poisoned;
• your cat may have swallowed string or another foreign object;
• there is significant blood in the vomit;
• your cat is extremely weak or collapsing;
• your cat has difficulty breathing;
• your cat appears to be in severe pain;
• repeated vomiting is preventing your cat from keeping down food or water;
• your cat’s overall condition is rapidly worsening.

Kittens, older cats, and cats with known medical conditions may have less reserve when they become ill, so it is reasonable to contact a veterinarian sooner when vomiting occurs in these animals.

What Not to Do When Your Cat Is Vomiting

It can be tempting to try something at home immediately, but some common responses can make the situation more dangerous.

Don’t Give Human Medications

Never give your cat human medication for nausea, pain, stomach irritation, or another problem unless your veterinarian specifically prescribed it for that cat.

Cats process many substances differently from people, and some commonly used human medications can be dangerous to them.

Don’t Try to Make Your Cat Vomit

Do not induce vomiting at home unless a veterinarian or veterinary poison professional specifically directs you to do so.

Depending on what your cat swallowed, inducing vomiting can cause additional injury.

Don’t Use Home Remedies as a Substitute for Veterinary Care

A home remedy cannot determine whether your cat has an intestinal obstruction, poisoning, kidney disease, pancreatitis, or another medical condition.

If vomiting is persistent or warning signs are present, delaying professional care can allow dehydration or the underlying illness to worsen.

Don’t Pull on Swallowed String

If string, ribbon, yarn, or similar material is visible from your cat’s mouth or anus, do not pull it.

Linear foreign bodies can be anchored somewhere inside the gastrointestinal tract, and pulling can cause serious injury.

Contact a veterinarian.

How to Reduce Vomiting Related to Feeding Habits

If a veterinarian has ruled out disease and the episodes appear related to your cat’s feeding routine, several practical adjustments may help.

Offer Smaller Meals

Instead of one or two very large meals, dividing the appropriate daily amount into smaller portions may help some cats.

Slow Down Fast Eaters

A slow feeder, puzzle feeder, or other feeding strategy may help a cat that finishes meals too quickly.

In multi-cat homes, feeding cats separately may reduce competition around food.

Change Foods Gradually

If you need to change your cat’s regular diet, transition gradually rather than suddenly whenever possible.

Keep Fresh Water Available

Cats should have access to clean, fresh water.

Changes in drinking behavior can also provide useful health information, so pay attention if your cat suddenly begins drinking much more or much less than usual.

Brush Your Cat Regularly

Regular brushing removes loose hair before your cat swallows it while grooming.

Cornell recommends regular brushing as one way to reduce hair accumulation and hairball problems.

Create a Calm Feeding Environment

Stress and competition around food can affect eating behavior.

Give your cat a quiet place to eat where other animals are not constantly approaching the bowl.

These measures are intended for feeding-related issues. They do not replace veterinary treatment when vomiting is caused by disease.

Frequently Asked Questions About Cat Vomiting

Why Is My Cat Throwing Up but Acting Normal?

A cat can vomit once and continue behaving normally.

An isolated episode does not always indicate a serious illness. What matters is whether the vomiting happens again and whether other changes develop.

Monitor your cat’s appetite, water intake, litter box habits, energy level, and behavior.

If vomiting becomes frequent, continues, or is accompanied by other symptoms, contact your veterinarian.

Why Does My Cat Keep Throwing Up?

There is no single explanation for a cat that keeps throwing up.

Possible causes range from gastrointestinal irritation, dietary issues, hairballs, and parasites to foreign objects and diseases affecting organs outside the digestive tract.

Frequent vomiting should be investigated rather than considered a normal part of being a cat.

Cornell recommends veterinary evaluation for cats vomiting more frequently than once per week.

Why Is My Cat Throwing Up Food?

If your cat is throwing up food, note how soon after eating the episode occurs.

Food returning almost immediately and without abdominal contractions may be regurgitation rather than vomiting.

True vomiting can also occur after eating and has many possible causes.

Repeated episodes, weight loss, appetite changes, or other symptoms warrant veterinary evaluation.

Why Does My Cat Throw Up After Eating?

Eating very quickly may contribute in some cats, but it is not the only possible explanation.

Vomiting after eating can also be associated with gastrointestinal or other medical problems.

If your cat throws up after eating repeatedly, contact your veterinarian rather than assuming the problem is simply eating too fast.

Is It Normal for Cats to Throw Up Hairballs?

Occasional hairballs can occur.

Cornell notes that expelling a hairball approximately every week or two is not uncommon in some cats. However, frequent vomiting, repeated unproductive retching, lethargy, or loss of appetite should be evaluated because the problem may not actually be a simple hairball.

Is a Cat Throwing Up White Foam Something to Worry About?

White foam alone cannot tell you the cause.

If it happens once and your cat otherwise appears completely normal, monitor closely.

If the vomiting recurs or your cat develops appetite loss, lethargy, diarrhea, pain, or another abnormal sign, contact your veterinarian.

Why Is My Cat Throwing Up Yellow Liquid?

Yellow liquid commonly contains bile.

While it can appear when the stomach is relatively empty, yellow color alone cannot establish why your cat vomited.

Repeated yellow vomiting should not simply be assumed to be hunger.

How Many Times Can a Cat Vomit Before Going to the Vet?

There is no single number that applies to every cat and every situation.

Frequency is only one part of the assessment.

Merck identifies vomiting more than once or twice daily, long-term vomiting, or vomiting associated with other abnormal signs as reasons for veterinary examination. Cornell recommends prompt evaluation when vomiting occurs more frequently than once per week or alongside other concerning symptoms.

If your cat has blood in the vomit, severe weakness, suspected poisoning, a possible foreign body, significant pain, or another serious sign, do not wait for a particular number of episodes before seeking help.

Can I Give My Cat Medicine for Vomiting?

Do not give medication unless a veterinarian has instructed you to use that medication for your cat.

Vomiting has many possible causes, and treating the symptom without identifying the underlying problem can delay appropriate care.

Some medications that are commonly used by humans can also be toxic or otherwise unsafe for cats.

Final Thoughts

There are many reasons for a cat throwing up.

Sometimes the explanation may be relatively simple. In other cases, repeated vomiting can be associated with gastrointestinal disease, a swallowed object, poisoning, parasites, kidney disease, hyperthyroidism, or another medical condition.

Rather than judging the situation by the vomit’s color alone, pay attention to the whole cat:

How often is your cat vomiting? Are they eating? Drinking normally? Using the litter box? Losing weight? Acting differently?

Those details can provide valuable information.

An isolated episode in an otherwise normal cat may simply need close observation. But if your cat keeps throwing up, the episodes become frequent, or any warning signs appear, contact your veterinarian.

Sources

• Cornell Feline Health Center — Vomiting

Cornell Feline Health Center — The Danger of Hairballs

Merck Veterinary Manual — Vomiting in Cats Merck Veterinary Manual — Introduction to Digestive Disorders of Cats

VCA Animal Hospitals — Vomiting in Cats