Why Does My Cat Keep Throwing Up? Causes, Warning Signs, and What to Do
Most cats throw up now and then, and a single episode followed by normal eating and behavior is rarely an emergency. A cat that keeps throwing up is different. Repeated vomiting can come from something simple, like eating too fast or swallowing hair, but it can also point to kidney disease, an overactive thyroid, a blockage, or poisoning.
This guide explains the most common reasons cats vomit, what the color and texture of the vomit can tell you, how veterinarians investigate it, and when you should stop watching and start calling. It is general information, not a diagnosis, and your own vet is the right person to judge your cat.
How worried should you be?
Veterinary sources draw the line in slightly different places, so use this table as a rough guide rather than a rule.
| What you are seeing | Level of concern | What to do |
|---|---|---|
| One episode, cat eats and acts normally afterward | Low | Watch closely and note what came up |
| An occasional hairball, otherwise healthy | Low to moderate | Mention it at your next vet visit |
| Vomiting more than once a week | Moderate | Book a vet appointment |
| Several episodes in a row, or ongoing for more than a day or two | High | Call your vet the same day |
| Blood, black or coffee-ground material, lethargy, no appetite, pain, a swollen belly, or a suspected toxin | Urgent | Go to an emergency vet |
Kittens, senior cats, and cats with existing conditions such as diabetes, kidney disease, or hyperthyroidism can become dehydrated quickly, so they deserve an earlier call.
Is your cat vomiting, regurgitating, or coughing?
These look similar from across the room, but they point to different problems, and your vet will want to know which one you saw.
- Vomiting is active. Your cat may drool, lick her lips, and swallow repeatedly, then heave with her abdominal muscles before bringing up stomach contents.
- Regurgitation is passive. Food comes back up soon after eating, often with no heaving, and it may look tube-shaped and mostly undigested.
- Coughing usually involves a crouched posture with the neck stretched out, and any foam produced is often swallowed again.
If you cannot tell which it is, record a short video on your phone. It can save your vet a lot of guesswork.
How often is too often?
Here is where the advice gets less tidy. Cornell’s Feline Health Center recommends prompt evaluation for cats that vomit more than once a week, or that vomit along with signs such as lethargy, weakness, decreased appetite, blood in the vomit, increased thirst, changes in urination, or diarrhea. Cornell also notes that bringing up a hairball every week or two is not unusual in itself.
VCA Animal Hospitals sets a tighter bar for hairballs specifically, suggesting a call to your vet if your cat vomits them more than once a month. Best Friends Animal Society points out that the old idea of a few vomiting episodes a month being normal is changing, and that frequent hairballs could signal a digestive problem that stops hair from passing through normally.
The practical takeaway: occasional vomiting is common, but a pattern is worth a conversation with your vet, even if your cat seems fine between episodes.
Common reasons a cat keeps throwing up
Vomiting is a symptom, not a diagnosis. Almost any feline illness can cause it, which is why the same behavior can mean very different things.
Eating too fast or too much
Cats that gulp their food swallow air along with it, and the combination can come straight back up. This is more likely in multi-pet homes where a cat feels she has to finish before another animal arrives. Smaller, more frequent meals help, as does spreading kibble across a flat tray or using a slow feeder or puzzle feeder instead of a deep bowl.
If a cat has not eaten for a day and then vomits undigested food, that is a different situation. Best Friends notes it can suggest an obstruction or a problem with the way food moves through the gut, so call your vet.
Hairballs
Cats swallow hair while grooming, and it can collect into a wad in the stomach. Cornell describes the typical hairball as a damp, cylindrical clump of hair moistened by digestive fluids. Long-haired cats and heavy groomers tend to produce more, and shedding seasons can make things worse.
Regular brushing reduces the amount of loose hair your cat swallows. Cornell also warns that a hairball that never comes up and instead moves into the intestines can cause a serious blockage. Merck Veterinary Manual advises seeing a vet if hairballs are frequent or if your cat is vomiting repeatedly, since something more serious than a hairball may be behind it.
A sudden food change, intolerance, or allergy
Switching foods abruptly can upset a cat’s stomach. Purina recommends mixing the new food into the old and increasing it gradually over 7 to 10 days. Some cats also react to a specific ingredient. Skin itching, bald patches, or diarrhea alongside vomiting can hint at an intolerance or allergy, and your vet can guide a proper diet trial.
Eating things they should not
Cats are curious, and what goes in can come back out. Cornell lists spoiled food, leaves of poisonous plants, human medications, string or yarn, antifreeze, chocolate, onions, and small household objects such as rubber bands and paper clips among the frequent culprits.
Lilies deserve special mention. The ASPCA lists true lilies (Lilium species, such as Easter and Asiatic lilies) as toxic to cats, with vomiting, loss of appetite, and lethargy as early signs and kidney failure as the main danger. Even a small exposure can cause acute kidney injury, and early treatment at a vet is what prevents failure. If your cat has chewed or licked a lily, call a vet or a pet poison helpline right away, even if she seems fine.
Parasites and infections
Intestinal worms can irritate the gut and trigger vomiting. In kittens and recently adopted strays especially, you may occasionally see a worm in the vomit. Viral and bacterial infections can also cause sudden vomiting. Your vet can test a stool sample and treat parasites with deworming medication.
Medical conditions behind ongoing vomiting
When vomiting keeps happening over weeks or months, vets look for an underlying disease. The ones that come up most often include:
- Inflammatory bowel disease
- Kidney disease
- Hyperthyroidism (an overactive thyroid, most common in older cats)
- Pancreatitis
- Liver disease
- Diabetes
- Constipation
- Gastrointestinal cancer, including lymphoma
Several of these also cause weight loss, increased thirst, or changes in appetite, so mention anything unusual, even if it seems unrelated.
What your cat’s vomit looks like, and what it might mean
Appearance can offer clues, but it cannot diagnose a problem on its own. Taking a photo of the vomit to show your vet is genuinely useful.
| Appearance | What it may indicate |
|---|---|
| Clear liquid | Fluid from an empty stomach, recently drunk water, or regurgitation from the esophagus |
| White foam | Often an empty stomach or irritation of the stomach or small intestine |
| Yellow or green liquid | Bile, common when the stomach is empty, though it can also accompany liver problems |
| Undigested food | Eating too fast, a food reaction, regurgitation, or sometimes an obstruction |
| A cylinder of hair with liquid | A hairball |
| Red blood or red streaks | Bleeding from the mouth, esophagus, or stomach; contact your vet |
| Black, dark brown, or coffee-ground material | Digested blood from higher in the digestive tract, possibly an ulcer; seek care promptly |
| Worms | Intestinal parasites; contact your vet for treatment |
When to call the vet, and when to go to the emergency clinic
Call your vet if your cat vomits repeatedly, continues for more than a day or two, or vomits more than once a week as an ongoing pattern.
Seek urgent or emergency care if vomiting comes with any of the following:
- Blood, or black or coffee-ground material in the vomit
- Lethargy, weakness, or collapse
- Loss of appetite or refusing water
- Signs of pain, or a swollen or tender belly
- Diarrhea or signs of dehydration
- Fever
- Retching with nothing coming up
- Suspected swallowing of a toxin, plant, string, or other foreign object
- Pale or yellow gums
- A cat with diabetes, kidney disease, or hyperthyroidism that starts vomiting repeatedly
Cats that vomit continuously and stop eating are prone to secondary problems, including liver disease, so waiting it out can do harm.
What your vet will do
The visit usually starts with questions. When did the vomiting start? How often does it happen, and how soon after eating? What is your cat eating, and has anything changed? Is she drinking or urinating more, losing weight, or going outdoors? Have any new plants, medications, or toys come into the house?
A physical exam follows, and then depending on the findings your vet may suggest blood work, a urinalysis, a fecal test, X-rays, or an ultrasound. If those do not explain things, endoscopy or exploratory surgery with biopsies may be considered, particularly when inflammatory bowel disease or cancer is suspected or a foreign object is likely.
Treatment depends on the cause. Common elements include:
- Fluids, given under the skin or through an IV for cats that are dehydrated or very unwell
- Anti-nausea medication such as maropitant
- Stomach-protecting or acid-reducing medications in some cases
- A bland or prescription digestive diet once vomiting settles
- Deworming, antibiotics, or disease-specific treatment when a cause is found
- Endoscopic or surgical removal of a foreign object
VCA notes that cats usually show improvement within a couple of days of starting treatment, and that if there is no improvement within 48 hours, the vet may change medication or run more tests.
What you can do at home
For a cat who vomited once and is otherwise bright and eating, a little careful observation is reasonable.
- Note the details. Write down when it happened, what came up, and what your cat did before and after. Photos help.
- Check for hazards. Look for chewed plants, string, hair ties, or an open cupboard.
- Keep fresh water available. Dehydration makes nausea worse.
- Ask before changing food. Guidance on fasting varies between sources, and cats should not go long without eating. Your vet can tell you whether to offer small, frequent portions of a bland or prescription diet. Boiled chicken is not a complete diet and is only a short-term option if your vet suggests it.
- Skip human medications. Do not give over-the-counter or leftover drugs to a vomiting cat unless your vet specifically directs it.
If vomiting continues or any red-flag sign appears, stop managing it at home and call.
How to reduce the odds of vomiting
You cannot prevent every episode, but a few habits remove the most common triggers.
- Brush your cat regularly, especially if she has long hair or sheds heavily.
- Feed smaller, more frequent meals, and use a slow feeder or spread kibble out if she gulps.
- Introduce new foods gradually over 7 to 10 days.
- Keep toxic plants, medications, cleaning products, antifreeze, and string or small objects out of reach. Never bring true lilies into a home with cats.
- Keep up with deworming and routine vet checkups so early signs of disease are caught sooner.
- Make sure each cat has her own feeding spot in a multi-pet home.
Frequently asked questions
Why does my cat keep throwing up but act normal?
Some cats vomit occasionally from an upset stomach, a hairball, or eating too fast and return to normal straight away. If it is a one-off, that is usually fine. If it keeps recurring, even with normal behavior, it is worth a vet visit, because chronic vomiting can be caused by conditions that develop gradually.
Why is my cat throwing up white foam?
White foam often comes from an empty stomach or irritation of the stomach lining. An occasional episode before a meal is common. Repeated foamy vomiting, or foam along with lethargy or poor appetite, should be checked by a vet.
Why is my cat throwing up undigested food?
The most common reason is eating too fast. It can also reflect a food intolerance, regurgitation caused by an esophageal problem, or a blockage, especially if it happens repeatedly or hours after eating. Slowing down mealtimes is a reasonable first step, but recurring episodes need a vet’s input.
Is it normal for a cat to throw up once a week?
Not usually. Cornell’s Feline Health Center recommends a vet evaluation for cats vomiting more often than once a week. Hairballs are the main exception that people tolerate, but even those are worth mentioning to your vet if they are frequent.
Can I give my cat anything to stop the vomiting?
Do not give over-the-counter or human medications without veterinary direction. Vets can prescribe anti-nausea medication that is safe and effective for cats, and they can check for the underlying cause at the same time.