Cat Vomiting and Not Eating: Causes and When to Worry
By Dr. Zubair Khalid, DVM, MS, PhD ·
Vomiting and not eating in cats often go together because nausea causes both. A single vomit followed by a skipped meal is usually minor, but repeated vomiting plus a cat that refuses food for more than 12 to 24 hours is a different problem. The longer a cat goes without eating or drinking, the higher the risk of dehydration and serious complications.
This article is educational and is not a substitute for veterinary diagnosis or treatment.
Quick Answer
- One or two vomits with a normal appetite and normal energy is usually not an emergency, but watch closely for the next 24 hours.
- A cat that vomits repeatedly (more than 3 to 4 times in a day) and will not eat needs to be seen by a veterinarian the same day.
- A cat that is vomiting and not eating or drinking, or that seems weak, wobbly, or unresponsive, needs emergency care right away.
- Vomiting more often than once per week, or vomiting with lethargy, diarrhea, blood in the vomit, or changes in thirst and urination, should be evaluated promptly [1].
- Never give human anti-nausea or pain medications to a cat. Many are toxic, and the dose depends on your cat's weight and health.
What Vomiting in a Cat Actually Looks Like
True vomiting is an active process. Your cat will drool, swallow repeatedly, retch, and use abdominal muscles to force stomach contents out through the mouth [2]. The material often contains partly digested food, bile (yellow or green fluid), or foam.
This is different from regurgitation, which is passive. Regurgitated food slides out with no retching or effort, and it often looks like an undigested tube of food shaped like the esophagus [2]. Regurgitation points to a different set of problems, so it helps to note which one you are seeing.
A hairball is a common and usually harmless form of vomiting. It looks like a damp, cylindrical wad of undigested hair mixed with bile and digestive fluids. Many cats bring one up every week or two without any lasting problem [1]. But frequent hairballs are not normal, and a clump of hair that moves into the intestines instead of coming up can cause a life-threatening blockage [1].
Common Causes of Vomiting and Not Eating in Cats
The list of possible causes is long, and many of them look identical at home. Vomiting can come from digestive system disease, kidney or liver failure, pancreatitis, or nervous system disorders. Other causes include poisons, insect stings or snake bites, internal parasites (including heartworm disease), infections, inflammation, drugs, swallowed foreign objects, food allergy, and tumors [2].
Dietary indiscretion is one of the most common triggers. Cats vomit after eating things like poisonous plant leaves, spoiled cat food, human medications, string or yarn, antifreeze, chocolate, onions, or small objects found on the floor such as paper clips and rubber bands [1].
| Cause | Typical clues | How urgent |
|---|---|---|
| Hairball | Damp cylindrical wad of hair, cat otherwise bright and hungry | Routine if occasional, vet visit if weekly or more |
| Dietary indiscretion or spoiled food | Vomiting after eating, often within hours, may include diarrhea | Same day if repeated or if the cat stops eating |
| Swallowed foreign object | Vomiting, anorexia, may progress to jaundice or abdominal pain | Emergency. A duodenal foreign body has caused bile duct obstruction in a cat [3] |
| Poisoning or toxin | Sudden vomiting, drooling, tremors, weakness | Emergency now |
| Infection (viral, bacterial, parasitic) | Vomiting with diarrhea, fever, lethargy, sometimes respiratory signs | Same day |
| Pancreatitis, kidney or liver disease | Ongoing vomiting, weight loss, increased thirst or urination, yellow gums | Same day to urgent |
| Systemic infection such as septic splenitis | Weeks of lethargy and vomiting, then diarrhea, fever, abdominal pain, pale gums | Emergency. One reported cat needed surgery and a 4-week antibiotic course [4] |
| Cancer or mass | Slow onset, weight loss, vomiting that keeps worsening | Prompt veterinary workup |
Feline enteric coronavirus is highly contagious between cats in close contact. It usually causes mild signs or none at all, but severe vomiting, diarrhea, and respiratory signs such as sneezing and coughing can occasionally occur [5].
Red Flags That Make It an Emergency
Some signs mean you should stop reading and call an emergency clinic.
- Vomiting and not eating or drinking for more than 12 to 24 hours, especially in a cat that also seems weak.
- Repeated vomiting in a single day, or vomiting that will not stop.
- Vomiting with diarrhea, particularly if the diarrhea is bloody or the cat looks dull.
- Blood in the vomit, or vomit that looks like coffee grounds.
- A cat that is straining to vomit but bringing nothing up, with a swollen belly. This can point to a blockage.
- Yellow gums, eyes, or skin. This suggests liver or bile duct trouble and needs urgent care [3].
- Known or suspected exposure to a toxin, human medication, string, or a small object.
- Collapse, seizures, trouble breathing, or a body temperature that feels very cold or very hot.
If your cat is vomiting and also has diarrhea, see Cat Vomiting and Diarrhea: When to Worry. For vomiting that happens mostly overnight, Cat Vomiting at Night: Causes and When to Worry covers the timing patterns that matter.
Safe Things You Can Do at Home While Waiting
Home care is about monitoring and comfort, not treatment. Do not give your cat any medication unless a veterinarian prescribed it for this cat.
Withhold food briefly, not water
For a single mild vomit in an otherwise bright cat, you can pull food for a few hours to let the stomach settle. Leave fresh water available. Do not withhold water for more than a short time, and never restrict water in a cat that is already dehydrated or not drinking.
Offer small, bland meals
If your cat is willing to eat, offer a small amount of its normal food or a bland cooked option in tiny portions every few hours. Large meals can trigger more vomiting. If your cat refuses even a favorite treat, that is a meaningful sign.
Track everything
Write down the time of each vomit, what it looked like, whether food or bile was present, and whether your cat ate, drank, urinated, or passed stool. This record helps your veterinarian far more than a general description.
Keep other pets and hazards away
If you have multiple cats, feed them separately so you know who is eating. Pick up string, yarn, rubber bands, and small objects. Check that houseplants are cat safe.
Do not induce vomiting at home
Never try to make your cat vomit. Inducing emesis in cats is difficult even for veterinarians. In one survey, veterinarians reported success in only about 58 percent of cats compared with nearly 99 percent of dogs [6]. A later study found that a detomidine gel given transmucosally induced vomiting in about half of cats, with sedation as a common side effect [7]. This is a procedure for a clinic, not a kitchen.
If your cat is not eating at all, Cat Not Eating? When to Worry and What to Do explains how quickly appetite loss alone becomes a problem.
What Your Veterinarian Will Check and Test
Your veterinarian will start with a full physical exam, including weight, hydration, gum color, abdominal palpation, and temperature. They will ask about the timeline, what your cat may have eaten, and whether other cats in the home are sick.
Testing often includes blood work to check organ function, electrolytes, and blood cell counts, plus a fecal exam for parasites. Imaging such as X-rays or ultrasound can find foreign objects, masses, or fluid. In one reported case, a 1-year-old cat with 5 days of vomiting and anorexia turned out to have a foreign object pressing on the bile duct, which showed up on ultrasound and CT and required surgery to remove [3].
Treatment depends on the cause. It may include fluids, anti-nausea medication, a prescription diet, deworming, antibiotics, or surgery. Antiemetic drugs such as maropitant are used in cats, and controlled studies show they reduce vomiting risk in certain situations [8]. Your veterinarian calculates the right drug and dose from your cat's weight and health.
Prevention and Daily Monitoring
- Brush your cat regularly to reduce hairball buildup, and talk to your vet if hairballs happen weekly or more [1].
- Feed a consistent, complete cat food and avoid table scraps, chocolate, onions, and other toxic foods [1].
- Store medications, string, yarn, and small objects out of reach.
- Keep houseplants that are safe for cats, or remove toxic ones.
- Weigh your cat monthly. Slow weight loss often shows up before appetite changes do.
- Watch for early clues: vomiting more than once a week, hiding, less grooming, or drinking more or less than usual [1].
- Keep up with parasite prevention and routine wellness visits.
Limitations and When to Contact a Veterinarian
No article can tell you what is wrong with your individual cat. Only a veterinarian who examines your cat can do that. Use these timing rules as a guide.
Emergency now: repeated vomiting, vomiting with a swollen or painful belly, blood in vomit, collapse, trouble breathing, seizures, suspected toxin or foreign object, yellow gums, or a cat that is vomiting and not eating or drinking.
Same day: vomiting more than 3 to 4 times in a day, vomiting with diarrhea, vomiting with lethargy, a cat that has refused food for 12 to 24 hours, or a cat with known kidney, liver, or heart disease.
Routine visit: vomiting once a week or more, occasional hairballs that are increasing, mild appetite changes, or any new pattern you do not understand [1].
If you are unsure, call your veterinarian or a pet poison control hotline. It is always safer to ask than to wait.
Frequently Asked Questions
How long can a cat go without eating after vomiting?
A cat that skips one meal after a single vomit is often fine, but refusal to eat for a full day is a warning sign. Cats that stop eating can develop liver problems quickly, so contact your veterinarian if your cat has not eaten in 24 hours or is also vomiting.
Should I force my cat to eat or drink?
No. Never force food or water into a vomiting cat, because it can cause choking or make vomiting worse. Offer small amounts and let your cat choose. If your cat will not drink, that is a reason to call the vet instead of push fluids at home.
Can I give my cat human anti-nausea medicine?
No. Human medications can be toxic to cats, and the correct drug and dose must be calculated by a veterinarian based on your cat's weight and health. Some prescription antiemetics are used in cats, but only under veterinary direction [8].
What if my cat vomits right after eating every time?
Vomiting right after eating can point to eating too fast, food intolerance, or a stomach problem. Try smaller, more frequent meals and note whether the vomiting continues. If it happens repeatedly or your cat starts losing weight or refusing food, schedule a veterinary exam.
Is a hairball the same as vomiting?
A hairball comes up through the same active vomiting process, so yes, it counts as vomiting. An occasional hairball every week or two is common, but frequent hairballs or vomiting without hair should be checked, because a hair clump that passes into the intestines can cause a blockage [1].
Related Articles
- Cat Not Eating? When to Worry and What to Do
- Cat Vomiting: When to Worry and What to Do
- Cat Vomiting: When to Worry and How to Help
- Cat Vomiting and Diarrhea: When to Worry
- Cat Vomiting at Night: Causes and When to Worry
- Cat Vomiting After Drinking Water: Causes and When to Worry
References
- Vomiting. Cornell University College of Veterinary Medicine.
- Vomiting in Cats - Cat Owners. Merck Veterinary Manual.
- Rare case of extrahepatic biliary obstruction caused by a duodenal foreign body in a cat. JFMS open reports, 2025.
- Successful Management of Septic Splenitis in an Abyssinian Cat. Veterinary medicine and science, 2026.
- Disorders of the Stomach and Intestines in Cats - Cat Owners. Merck Veterinary Manual.
- Inducing emesis in Australian dogs and cats: agents, adverse effects and antiemetic administration. Australian veterinary journal, 2025.
- Transmucosal detomidine gel induces emesis in approximately half of cats presenting for dietary indiscretion. Journal of the American Veterinary Medical Association, 2026.
- Receptor-Targeted Antiemetic Strategies in Cats: A Systematic Review and Intervention-Specific Meta-Analysis. Veterinary medicine and science, 2026.