Last updated: October 3, 2026
Cat Health
Cat Throwing Up: Causes and When to Worry
A cat throwing up now and then can be minor, but frequent or ongoing vomiting is not normal, despite what many people assume. Here is how to read the causes, what the vomit may be hinting at, and when it is an emergency.
This guide is general information, not veterinary advice. Every cat is different. If your cat is unwell or you are worried, contact your veterinarian, who can examine your cat and give advice for their specific situation.
Call your vet or an emergency clinic now if your cat has any of these
- Unproductive retching or gagging with a swollen or distended belly
- Repeated vomiting together with lethargy, weakness, or signs of dehydration
- Blood in the vomit, whether fresh red or dark like coffee grounds
- Cannot keep any water down, or has a painful, bloated abdomen
These can mean a serious blockage, poisoning, or rapid fluid loss, and cannot wait for a routine appointment.
Common Causes of Vomiting in Cats
What tends to be behind it, from everyday triggers to illness
Hairballs
Cats swallow loose hair while grooming, and it can trigger retching that brings up a hairball. The rare hairball can happen, but frequent hairballs, or retching that produces nothing, are not something to shrug off and deserve a vet visit.
Eating too fast, or a diet change
Gulping food down or eating too much at once can make a cat bring it straight back up. A sudden switch of food, or a food intolerance, can also upset the stomach. New foods are best introduced gradually over several days.
A swallowed object, infection, or parasites
String, small toys, or other objects can partly or fully block the gut and cause repeated vomiting, which is an emergency. Stomach and intestinal infections and parasites such as worms are also common causes and need veterinary diagnosis.
Chronic illness, including in older cats
Inflammatory bowel disease can cause ongoing vomiting. In older cats, kidney disease and hyperthyroidism are frequent causes and often come with weight loss or increased thirst. These need veterinary testing to diagnose and manage.
What the Vomit May Look Like, and What It Can Hint At
Use this as a clue, not a diagnosis. Only your vet can confirm the cause.
| What you may see | What it often looks like | What it can hint at, and what to do |
|---|---|---|
| Undigested food soon after eating | Whole or barely broken-down kibble or food, brought up shortly after a meal | Often linked to eating too fast, overeating, or a diet that does not agree with your cat. Frequent episodes still warrant a vet check. |
| Yellow or green bile | Thin yellow or greenish fluid, often on an empty stomach | Can hint at an empty stomach or an irritated digestive tract. If it repeats or comes with other signs, contact your vet. |
| Clear or white foam | Watery or foamy liquid with little or no food | May point to an empty stomach or stomach irritation. Repeated foamy vomiting deserves a veterinary exam. |
| Blood | Fresh red streaks, or dark material that looks like coffee grounds | Blood in vomit is never something to wait on. Call your vet or an emergency clinic the same day. |
Occasional Versus Frequent or Chronic Vomiting
There is a common myth that cats are just sicky animals and that regular vomiting is normal. It is not. A single episode in a cat who is otherwise bright, eating, and drinking is often minor and passes on its own. But vomiting that happens several times in a day, keeps coming back week after week, or is slowly becoming more frequent is a signal that something needs looking into.
Chronic vomiting always warrants a vet. Ongoing vomiting over weeks can point to conditions like inflammatory bowel disease, kidney disease, or hyperthyroidism, and the sooner these are found, the better they can be managed. Keep a simple log of how often it happens, what the vomit looks like, and whether your cat is eating, drinking, and acting normally, since this helps your vet a great deal.
When to See a Vet
A one-off vomit in a cat who is otherwise well can often be watched at home for a short time. Book a veterinary appointment if your cat vomits repeatedly in a day, cannot keep water down, or you notice any of these red flags: blood in the vomit, lethargy, not eating, or a painful or bloated belly. For the emergency signs listed at the top of this page, such as unproductive retching with a distended abdomen, do not wait for an appointment.
Vomiting often appears alongside other symptoms. If your cat is also off their food, see why your cat is not eating. If loose stools come with it, our guide to cat diarrhea may help, and repeated vomiting can quickly lead to fluid loss, so it is worth knowing the signs of cat dehydration. Frequent hairball-related retching is covered in our cat hairballs guide.
Frequently Asked Questions About Cat Vomiting
Common questions about why cats throw up and when it is serious
Why is my cat throwing up?
Cats vomit for many reasons, from a hairball or eating too fast to a recent diet change, a food intolerance, a swallowed foreign object, an infection or parasites, or inflammatory bowel disease. In older cats, kidney disease and hyperthyroidism are common culprits. A single isolated episode in a cat who is otherwise bright and eating is often minor, but repeated, frequent, or ongoing vomiting is not normal and should be checked by a vet.
When should I worry about my cat vomiting?
Worry, and book a veterinary visit, if your cat vomits several times in a day, cannot keep water down, has blood in the vomit, or is also lethargic, not eating, or has a painful or bloated belly. Chronic vomiting that continues over weeks always warrants a vet, even if your cat seems otherwise well. Contrary to a common belief, frequent vomiting is not normal for cats and is a reason to get them examined.
Cat throwing up undigested food, why?
Bringing up whole or barely digested food soon after a meal is often linked to eating too fast, eating too much at once, or a food that does not agree with your cat. Sometimes it happens when several cats compete at the bowl. If it keeps happening, or comes with weight loss, low energy, or diarrhea, see your vet, since it can also signal a food intolerance or a digestive problem.
Is it normal for cats to vomit regularly?
No. This is a common myth. An occasional hairball or a rare upset stomach can happen, but regular or frequent vomiting is not a normal part of being a cat. Vomiting more than about once or twice a month, or any vomiting that is becoming more frequent, is a signal that something needs looking into. Ask your vet rather than assuming it is just how your cat is.
What can I do at home while I wait to see the vet?
Remove uneaten food for a short time, make sure fresh water is always available, and watch closely for the emergency and red-flag signs on this page. Note how often your cat vomits, what the vomit looks like, and whether they are eating, drinking, and acting normally. Do not give any human medicine or over-the-counter product, as many are dangerous to cats. Let your vet guide any treatment.
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