Veterinarian-written / veterinarian-approved articles for your cat.

Vomiting in Cats

You’re relaxing on the couch when you hear that familiar retching noise. “Huk, huk, huk…” Part of you hopes that whatever Cleo is bringing up will land on the tile floor not the rug, but you also feel that niggling worry; is she okay? Most people who live with cats have some experience with cleaning up vomit, but what should you do and when is there cause for concern? And if Cleo has to see the veterinarian, what sort of information would be helpful to have, and what testing may be performed?

When should you call the veterinarian?

Your cat may vomit once or twice, but then seem just fine, with normal behavior, energy, and appetite. The vomiting may be self-limiting and respond to home treatment (see box below). However, prolonged vomiting may lead to dehydration or indicate a more serious problem. The following are reasons to call your veterinarian right away:

  • If the vomit is bloody or accompanied by loss of appetite, lethargy, or diarrhea.
  • If vomiting persists for over 24 hours.
  • If vomiting is chronic, i.e. continues off and on for more than 1-2 weeks.
  • If your cat is vomiting persistently and is either very young, very old, or in otherwise frail health.

If there is any doubt, call your veterinarian right away, as vomiting can be a sign of serious illness.


There are many causes of vomiting in cats, and this article is meant as a brief survey of the. The following are some of the more common ones.

  • A common cause of vomiting is hairballs, which occur when a cat has built up excess fur in the digestive system. The cat may have a few bouts of unproductive retching, but eventually vomits up a tubular wad of hair. Once expelled, the cat feels better and resumes his or her normal behavior. Hairballs can often be minimized by brushing your cat daily, and by giving various foods or hairball remedies. Consult your veterinarian for the best advice.
  • Sometimes vomiting results from a kitty eating too quickly. The food will come back up, un-chewed and undigested,soon after the meal. Consult your veterinarian for advice on addressing this common misbehavior.
  • Rapid diet changes can lead to vomiting; food changes should be done gradually over a period of five to seven days. People-food treats can also cause tummy upset. Stick to lean, cooked meats or fish devoid of spices or sauces when sharing your food with your cat.
  • Food allergies or IBD (inflammatory bowel disease) can lead to vomiting. In this case, the vomiting is chronic, and may be accompanied by diarrhea, flatulence, and weight loss.
  • Certain prescribed drugs, such as antibiotics or pain medications, may irritate the stomach or trigger a vomiting reflex. If you suspect this is the case, call your veterinarian right away for instructions or alternatives.
  • A variety of infections and parasites can cause vomiting. These include: panleukopenia, salmonella, roundworms, giardia.
  • A blockage anywhere along the intestinal tract can lead to vomiting. Blockage may be caused by: foreign body, hairball, tumor, or severe constipation.
  • Diseases of other organs such as kidney failure, liver disease, gallbladder disease, pancreatitis, hyperthyroidism, urinary tract blockage, or diabetes may also include vomiting as a sign.
  • Toxins such as lead, certain plants, or antifreeze can cause vomiting as well. If you suspect your cat has ingested something toxic, call your veterinarian right away.

At the Vet’s Office

Home care for vomiting

If your cat has only vomited once or twice and is acting otherwise fine, it make sense to try some symptomatic home care.

  • Remove all food and water for 3-4 hours
  • If no vomiting occurs, offer small amounts of water
  • If this stays down, after 1-2 hours, offer a very small amount of bland food such as Hill’s i/d, low-fat deli turkey, or chicken, turkey or beef baby food.
  • If this stays down, feed small amounts frequently over the next 24 hours.
  • Thereafter, reintroduce normal diet and feeding schedule.
  • If the cause of vomiting is apparent (e.g. eating plants, a new food), eliminate it.
  • Never give any medications (e.g. Pepto Bismol, Laxatives, or pain remedies) to your vomiting cat unless specifically prescribed by your veterinarian. This could be hazardous or even fatal.

If vomiting persists despite these measures, consult your veterinarian.

The most important item (besides your cat) to bring to the veterinarian is a thorough history. Your veterinarian will want to know: How long has the vomiting been going on, how frequent is it, does the vomit consist of food, clear liquid, bile or blood, or any recent diet changes; are there other symptoms; and how is your cat’s appetite, and attitude? Is it possible your cat ate anything (string, rubber bands, ribbon, plants) or got into something (household chemicals, antifreeze, the trash) that she shouldn’t have? There are so many causes of vomiting that a thorough history is essential to help your veterinarian narrow down the search.

A complete physical examination is the next step. Sometimes the history and examination yield enough information and a treatment plan can be made. Other times, your veterinarian may need to gather more information. Tests may include:

  • Bloodwork
  • Urinalysis
  • Xrays
  • Ultrasound
  • Endoscopy
  • Exploratory surgery
  • Surgical biopsy

Treatment depends on diagnostic findings and severity of symptoms. Cats who are bright, alert, and have normal physical findings can be treated on an outpatient basis with subcutaneous fluids and injectable medications. Those presenting with fever, abdominal pain, or with abnormal test results, may need hospitalization and further intervention.

“Yerk!” Phew- it was only a hairball this time, and Cleo managed to make it to the kitchen. From now on Cleo will get her hairball medicine!

Disclaimer: This website is not intended to replace professional consultation, diagnosis, or treatment by a licensed veterinarian. If you require any veterinary related advice, contact your veterinarian promptly. Information at is exclusively of a general reference nature. Do not disregard veterinary advice or delay treatment as a result of accessing information at this site.