My Cat Keeps Throwing Up: When to Worry & What to Do

If your cat seems to throw up on a regular basis, you’re not alone — and you’re right to be concerned. The occasional hairball on the carpet is one thing, but when your cat keeps throwing up week after week, something deeper is usually going on.

Many cat owners search for “why does my cat keep throwing up” expecting a simple answer. The truth is that chronic vomiting in cats has a wide range of causes — some minor, some serious — and the frequency, color, and timing of the vomit all matter. This guide covers the eight most common reasons your cat is constantly throwing up, how to tell when it is an emergency, and what you can do at home to help.

If you are dealing with a one-time vomiting episode rather than an ongoing pattern, start with our complete guide on why your cat is throwing up instead. And if you want to decode what the vomit looks like, check the cat vomit color chart or use our cat vomit color checker tool.

How Often Is It Normal for a Cat to Vomit?

This is the first question most cat owners ask, and it is a fair one. Cats vomit more than dogs, more than humans, and more than most other pets. But “cats just throw up sometimes” has become such a common refrain that many owners dismiss chronic vomiting as normal when it is not.

Here is a realistic baseline:

• Normal: An occasional hairball — roughly once every two to four weeks — in an otherwise healthy cat. The cat is eating well, maintaining weight, and acting like themselves.
• Worth monitoring: Vomiting once a week. This falls into a gray zone. Some cats with long coats produce hairballs at this rate, but weekly vomiting still deserves attention.
• Not normal: Vomiting two or more times per week, or a cat throwing up every day. At this frequency, something is causing chronic irritation or illness, even if your cat seems fine between episodes.

The key takeaway: if your cat keeps throwing up more than once a week on a consistent basis, it is time to investigate — not wait and see.

8 Common Reasons Your Cat Keeps Throwing Up

1. Hairballs

Hairballs are the most familiar cause of cat vomiting, and for many owners, the assumed default explanation. When cats groom themselves, they swallow loose fur. Most of it passes through the digestive tract without issue. But when too much fur accumulates in the stomach, your cat will vomit up a cylindrical wad of hair — the classic hairball.

Long-haired breeds like Persians, Maine Coons, and Ragdolls are more prone to hairballs, as are cats going through seasonal coat changes in spring and fall. Over-grooming due to stress or skin irritation can also increase hairball frequency.

Hairballs become a problem when they happen more than once every couple of weeks, or when your cat retches repeatedly without producing anything. That can indicate a blockage forming deeper in the GI tract.

For proven strategies to reduce hairball frequency, see our detailed guide on cat hairball remedies.

2. Eating Too Fast

If your cat inhales food like it is their last meal and vomits within minutes — often producing a pile of barely-chewed kibble — speed eating is the likely culprit. The stomach stretches too quickly, triggers a reflex, and the food comes right back up. This is technically regurgitation rather than true vomiting, but the result is the same: a mess on the floor and a concerned owner.

This is especially common in multi-cat households where cats compete for food, former strays with resource-guarding instincts, and cats who are simply food-obsessed.

The fix is usually straightforward: slow feeder bowls, puzzle feeders, or splitting meals into smaller, more frequent portions. We cover all the solutions in our guide on cat throwing up after eating.

3. Food Sensitivity or Allergy

Not every food agrees with every cat. Food sensitivities and allergies are a surprisingly common cause of chronic vomiting — and they can develop at any age, even to a food your cat has eaten for years without issue.

True food allergies involve an immune response, usually to a specific protein. The most common allergens in cats are chicken, beef, fish, and dairy. Food sensitivities (or intolerances) are less severe but can still cause ongoing GI upset including vomiting, diarrhea, gas, and poor coat quality.

Signs that food may be the issue:

• Vomiting happens consistently after meals
• Soft stool or diarrhea accompanies the vomiting
• Your cat has itchy skin, ear infections, or over-grooms certain areas
• Symptoms appeared after a food change (though not always)

The gold-standard diagnosis is a veterinary elimination diet trial lasting 8-12 weeks. This is not the same as simply switching brands at the pet store — it requires a novel protein or hydrolyzed diet prescribed by your vet. For soothing your cat’s stomach during the process, our cat upset stomach remedies guide has practical advice.

4. Inflammatory Bowel Disease (IBD)

IBD is one of the most common causes of chronic vomiting in middle-aged and older cats. It is not a single disease but a group of conditions where inflammatory cells infiltrate the walls of the GI tract, interfering with normal digestion and absorption.

Cats with IBD often vomit frequently — sometimes daily — and may also have diarrhea, weight loss, decreased appetite, or a dull coat. Some cats alternate between normal days and bad days, which makes owners think the problem is resolving on its own. It usually is not.

IBD is diagnosed through intestinal biopsies (endoscopic or surgical) after other causes have been ruled out with bloodwork and imaging. Treatment typically involves dietary management, corticosteroids, and sometimes immunosuppressive medications.

If your cat is throwing up every day and losing weight despite eating, IBD should be high on the list of suspects.

5. Chronic Kidney Disease (Especially Older Cats)

Chronic kidney disease (CKD) is extremely common in senior cats. Studies estimate that over 30 percent of cats over the age of 15 have some degree of kidney disease. One of the earliest and most consistent symptoms is vomiting — often with decreased appetite, increased thirst, increased urination, and gradual weight loss.

The kidneys filter waste products from the blood. When they lose function, toxins accumulate and cause nausea, stomach ulceration, and vomiting. The vomiting may be intermittent at first but tends to become more frequent as the disease progresses.

If your cat is over 10 years old and keeps throwing up, kidney disease is one of the first things your vet will test for. A simple blood panel and urinalysis can detect it. Use our cat age calculator to check where your cat falls on the aging spectrum — cats over 10 in human years are roughly 56 or older in cat years, which is when kidney screening becomes important.

6. Hyperthyroidism (Overactive Thyroid)

Hyperthyroidism is the most common hormonal disorder in cats, typically affecting those over 10 years old. The thyroid gland produces too much thyroid hormone, which revs up the metabolism and affects nearly every organ system.

Classic signs include vomiting, weight loss despite a ravenous appetite, increased thirst, hyperactivity or restlessness, a greasy or unkempt coat, and sometimes diarrhea. Some owners describe their hyperthyroid cat as “acting like a kitten again” — but the weight loss and vomiting tell a different story.

Diagnosis is straightforward: a blood test measuring T4 (thyroid hormone) levels. Treatment options include daily medication, a prescription iodine-restricted diet, radioactive iodine therapy (considered the gold standard), or surgical removal of the affected gland.

7. Parasites (Roundworms, Tapeworms)

Intestinal parasites are a common but often overlooked cause of chronic vomiting, especially in kittens, outdoor cats, and cats that hunt. Roundworms and tapeworms are the most frequent offenders.

Roundworms can cause vomiting, diarrhea, a pot-bellied appearance, and poor growth in kittens. In severe infestations, you may see live worms in the vomit — they look like thin, white spaghetti. Tapeworms more commonly cause weight loss and small rice-grain-like segments near the tail, but heavy infestations can also trigger vomiting.

Other parasites like giardia, coccidia, and hookworms can also cause chronic GI upset. Even indoor cats can pick up parasites from fleas, contaminated soil tracked in on shoes, or from hunting insects.

If your cat goes outdoors, hunts, or has not been dewormed recently, a fecal test is a simple and inexpensive place to start.

8. Stress or Anxiety

Cats are creatures of routine, and disruptions to their environment can manifest as GI symptoms — including chronic vomiting. Stress-induced vomiting is a real phenomenon in cats, though it is often a diagnosis of exclusion (meaning your vet rules out physical causes first).

Common stressors that can trigger vomiting:

• A new pet, baby, or roommate in the household
• Moving to a new home
• Changes in daily routine or feeding schedule
• Conflict with other cats (which can be subtle — blocking access to resources, staring, or territorial posturing)
• Construction noise, frequent visitors, or other environmental disruptions

Stress can also cause over-grooming, which leads to more hairballs, which leads to more vomiting — a frustrating cycle. If your cat started throwing up around the time of a major change, stress is worth considering, but always rule out medical causes first.

”My Cat Keeps Throwing Up But Seems Fine” — Should I Still Worry?

This is one of the most common things cat owners say, and it makes complete sense. Your cat vomits, then walks over to the food bowl and starts eating again. They play, purr, and act totally normal. How bad can it really be?

The honest answer: it can be quite bad. Cats are masters at hiding illness. This is not a personality quirk — it is a survival instinct. In the wild, a visibly sick cat is a target for predators. Domesticated cats retain this instinct, which means they will eat, play, and act normal even when they are dealing with significant internal disease.

By the time a cat with chronic kidney disease, IBD, or hyperthyroidism actually starts acting sick — refusing food, hiding, becoming lethargic — the disease has often progressed considerably.

So if your cat keeps throwing up but seems fine, take the vomiting itself as the symptom. Do not wait for your cat to “act sick” before seeking veterinary care. Frequent vomiting is the signal.

Monitor closely for subtle changes that are easy to miss:

• Gradual weight loss. Weigh your cat monthly — even half a pound lost in a 10-pound cat is significant. Use our cat weight chart for reference ranges by breed and age.
• Slightly decreased appetite. Your cat is eating but leaving a bit more in the bowl each day, or becoming pickier.
• Drinking more water than usual. Increased thirst is an early sign of kidney disease, diabetes, and hyperthyroidism.
• Sleeping more or playing less. Subtle energy shifts are easy to miss day to day but add up over weeks.
• Changes in litter box habits. Larger urine clumps, softer stool, or changes in frequency.

These shifts can happen so slowly that you do not notice them day to day. But combined with chronic vomiting, they paint a picture that your vet needs to see.

When to See the Vet: Red Flags Checklist

Some situations require a vet visit right away — not a “wait and see” approach. Take your cat to the vet promptly if you notice any of the following:

1. Vomiting multiple times in a single day, especially if your cat cannot keep water down
2. Blood in the vomit — bright red streaks or dark, coffee-ground-like material
3. Projectile vomiting or violent heaving that produces little to nothing
4. Lethargy or weakness — your cat is not moving, hiding, or unresponsive
5. Refusal to eat for more than 24 hours (prolonged fasting can trigger hepatic lipidosis, a dangerous liver condition)
6. Noticeable weight loss over weeks or months alongside the vomiting
7. Abdominal pain — your cat flinches, growls, or hunches when you touch their belly
8. Diarrhea combined with vomiting, which accelerates dehydration
9. Known or suspected toxin exposure — your cat chewed on a plant, ate something unusual, or got into a chemical
10. Vomiting in a kitten under six months — young cats dehydrate rapidly and have less physiological reserve

Even without these red flags, any cat that has been vomiting consistently for more than two weeks deserves a vet evaluation. Chronic vomiting is not something to normalize.

What Your Vet Will Do

When you bring a chronically vomiting cat to the vet, expect a systematic workup. The vet’s goal is to identify the underlying cause rather than just treating the symptom. Here is what the diagnostic process typically looks like:

Physical exam. The vet will feel your cat’s abdomen for masses, thickened intestines, enlarged kidneys, or an enlarged thyroid gland. They will also assess body condition, hydration status, and coat quality.

Bloodwork. A complete blood count (CBC) and comprehensive metabolic panel are usually the first tests ordered. These can detect kidney disease, liver problems, elevated white blood cells (suggesting infection or inflammation), and electrolyte imbalances. A T4 (thyroid) level is typically added for cats over 10 years old.

Fecal exam. A stool sample checks for intestinal parasites — roundworms, tapeworms, giardia, and others.

Urinalysis. Evaluates kidney function and hydration. This is especially important for older cats.

X-rays. Abdominal radiographs can reveal foreign bodies, masses, intestinal gas patterns, and organ size abnormalities.

Ultrasound. Provides a more detailed look at the GI tract, liver, kidneys, pancreas, and lymph nodes. Ultrasound can detect thickened intestinal walls (suggesting IBD or lymphoma), masses, and other structural changes that X-rays miss.

Food trial. If bloodwork and imaging are normal, your vet may recommend a dietary elimination trial to test for food sensitivity. This involves feeding a single novel protein or hydrolyzed diet for 8-12 weeks with no other food, treats, or flavored medications.

Endoscopy or biopsy. If other tests are inconclusive, the vet may recommend endoscopic biopsies of the stomach and intestine. This is the definitive way to diagnose IBD versus intestinal lymphoma.

Not every cat needs every test. Your vet will tailor the workup based on your cat’s age, symptoms, and initial findings.

How to Reduce Chronic Vomiting at Home

While you work with your vet on a diagnosis, there are several evidence-based strategies you can implement at home to reduce vomiting frequency. These are not substitutes for veterinary care — they are complementary steps.

Use a slow feeder bowl. If your cat eats too fast, a slow feeder can dramatically reduce post-meal vomiting. These bowls have ridges or mazes that force your cat to eat one piece at a time. For more on this approach, see our guide on cat throwing up after eating.

Feed smaller, more frequent meals. Instead of two large meals a day, try three or four smaller ones. This reduces the volume hitting the stomach at once and keeps blood sugar more stable. Use our cat calorie calculator to figure out the right total daily amount, then divide it into smaller portions.

Stick to a consistent diet. Avoid frequently switching foods. If you need to change diets, transition gradually over 7-10 days by mixing increasing amounts of the new food with the old.

Establish a regular brushing schedule. For hairball-prone cats, daily brushing during shedding season and two to three times per week otherwise can significantly reduce the amount of fur your cat swallows. Long-haired breeds especially benefit from consistent grooming.

Consider a veterinary probiotic. Probiotics formulated specifically for cats can support gut health and reduce GI inflammation. Look for products with clinically studied strains — your vet can recommend a specific brand.

Minimize stress. Ensure your cat has access to quiet resting spots, clean litter boxes (one per cat plus one extra), vertical space, and predictable routines. In multi-cat homes, make sure resources are distributed so no cat is being blocked from food, water, or litter.

Elevate the food bowl slightly. Some cats vomit less when eating from a raised bowl (2-4 inches off the ground), which allows gravity to assist swallowing. This is not proven to help every cat, but it is a low-risk change worth trying.

For more home remedies for digestive upset, see our guide on cat upset stomach remedies.

FAQ

How often is too often for a cat to throw up?

An occasional hairball every few weeks is generally normal. But if your cat is vomiting once a week or more — regardless of the cause — that frequency warrants a vet visit. A cat throwing up every day is never normal, even if the cat seems fine otherwise. Chronic vomiting can indicate anything from food sensitivity to serious organ disease.

Why does my cat keep throwing up but act normal afterward?

Cats are hardwired to hide signs of illness. A cat that vomits and then immediately returns to eating and playing may still have an underlying condition like IBD, kidney disease, or food intolerance. The vomiting itself is the symptom — do not wait for behavioral changes to take action. If the vomiting is happening regularly, schedule a vet appointment.

Can I give my cat anything at home to stop the vomiting?

Do not give your cat human medications (Pepto-Bismol, Tums, etc.) without veterinary guidance — some are toxic to cats. Safe home steps include switching to a bland diet (plain boiled chicken and plain canned pumpkin) for 24-48 hours, using a slow feeder, and withholding food for a few hours after a single episode to let the stomach settle. Always provide access to fresh water. If vomiting persists beyond 24 hours or happens multiple times in a day, see the vet.

Should I change my cat’s food if they keep throwing up?

Possibly, but do it strategically. Random brand-switching can actually make things worse by introducing new proteins and irritants before the gut has healed. If you suspect food sensitivity, talk to your vet about a proper elimination diet using a novel protein or hydrolyzed food. A true food trial takes 8-12 weeks to be conclusive. Simply switching from one chicken-based kibble to another chicken-based kibble will not help if chicken is the problem.

When is cat vomiting an emergency?

Seek emergency veterinary care if your cat is vomiting blood, cannot keep water down, is lethargic or unresponsive, has a distended or painful abdomen, has not eaten in more than 24 hours, or may have ingested a toxin or foreign object. Kittens under six months who vomit repeatedly should also be seen urgently, as they dehydrate much faster than adult cats. When in doubt, call your vet — it is always better to check than to wait.