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What is Vomiting?

Vomiting is the act of forceful expulsion of the content of the stomach. If your cat is about to vomit, you may notice her acting restless, drooling, swallowing, and crouching on all fours with her neck stretched out. Many times, vomiting can simply be your cat’s stomach rejecting whatever is in it, or it could be a sign of a more serious medical condition. While vomiting can often be treated, chronic vomiting could cause dehydration, which can severely weaken your cat. Reasons your cat may vomit can include:

  • Eating too fast
  • Minor stomach upset 
  • Foreign body obstruction 
  • Hairball 
  • Food allergies 
  • Poor quality diet or treats 
  • Poisoning 
  • Bacterial, viral, or parasitic infection 
  • Internal medical condition

Why Vomiting Occurs in Cats

The reason for your cat’s vomiting will depend on your cat’s eating habits and health.

Eating Too Fast

Some cats tend to gulp down their food the second it is in front of them, only to throw up undigested pieces soon after. This can be especially evident in multi-cat households where there is competition for resources.

Minor Stomach Upset 

Cats can sometimes eat things their stomachs just can’t handle, such as bugs, garbage, spoiled food, or other items that just don’t agree with their delicate system. Vomiting out the undesirable item is a safe way to ensure the health of the body. 

Foreign Body Obstruction

Sometimes, that undesirable piece of something, such as string, gets stuck in the digestive system and cannot be vomited out. An object that gets lodged in the stomach or intestines can create an obstruction that comprises the function of the digestive system, blocking food from continuing down its normal path.


Every cat owner is familiar with that cylindrical wad of slimy hair amidst digestive juices that our felines love to gift to us. Grooming is a natural part of every cat’s daily routine, but the hair that they swallow in the process is not digestible. Vomiting up a hairball every week or two is not a cause for alarm, as it ensures that the hair does not cause a dangerous blockage in the intestines.

Food Allergies 

Not only can cats develop allergies to their own food, but they can also have allergies to food items that are only occasionally in their diet. Allergies are common in cats, which is why there are so many protein choices in the pet food market right now. Cow’s milk, another common vomit instigator, is a food that all cats cannot digest as they lack the right enzyme to break it down.

Poor Quality Diet or Treats 

For a long time, the pet food market has produced rendered, dry, grain filled diets that are inappropriate for our feline friends. Rendered proteins are generally not choice meat pieces and are hard for our cats’ systems to digest. Lots of foods and treats also contain artificial flavors, smells, and preservatives, all of which can cause your cat’s digestive system to become inflamed and attempt to expel the chemicals.


There are many things in your cat’s environment that can poison her if she ingests it. Many indoor and outdoor plants can be toxic, as can poisons such as herbicides and pesticides, household cleaners, antifreeze, lead and other chemicals, human foods such as chocolate, garlic, and onions, and human medicine. Many of these things can be found in or around your house. If your cat has a sudden, acute, and severe case of vomiting, check the contents as she may have been poisoned.

Bacterial, Viral, or Parasitic Infection 

There are many types of infectious agents that can cause vomiting in cats of any age. Often, if an infectious agent is the cause of the vomiting, you may see other symptoms. Parasites may be evident in the vomit or feces. Younger and poorly vaccinated cats may be at a higher risk for some bacterial and viral infections.

Internal Medical Condition 

There is a wide variety of internal conditions that can cause a symptom like vomiting. There are digestive conditions, such as constipation, inflammatory bowel disease, colitis, pancreatitis, ulcers, and GI inflammation. Cancer in the stomach or intestines can cause vomiting. Metabolic diseases can include hyperthyroidism, diabetes, and kidney disease. Vomiting can also be a sign of organ failure, such as in the kidneys or liver.

What to do if your Cat is Vomiting

If your cat vomits sporadically, it may be a healthy reaction to hairballs, or food or other items that have been swallowed. Vomiting that occurs more than once a day, for several days, or is accompanied by other symptoms may indicate a more serious problem and needs to be checked by your veterinarian.

Be sure to tell your veterinarian about your cat’s eating habits, history of vomiting, contents of the vomit, accompanying symptoms, any possible toxic ingestions, and medical history. Your vet may run a series of tests after a physical exam to determine the reason, which can include blood, urine and fecal tests, X-rays and ultrasounds, and an endoscopy.

Once a diagnosis is made, treatment can be determined based on what is ailing your cat. For most cases of vomiting, a short fast of 24 hours is recommended, followed by a bland diet. Cats can become dehydrated and may need fluid therapy. Antibiotics and anti-emetics, along with other appropriate medications may be needed. Parasitic infections will be treated with deworming medications, while cases of poisoning will use antidotes and supportive care. Food allergies are treated with a change in diet. More serious conditions, such as kidney failure and cancer, will be treated appropriately. Obstructions may need emergency surgery.

For those cats whose eating habits are causing the vomiting, there are simple solutions that you can do at home. For gobblers, try portioning out each meal into smaller meals, or use a baking sheet or muffin cup sheet to spread out the food. For those kitties who love to munch on houseplants, try growing plants that are good for them, such as wheat grass or catnip. And for the cat who leaves you hairballs, routinely groom her and any other cats in the house to cut down on the amount of hair she ingests.

Prevention of Vomiting

While many internal conditions are difficult to predict, and therefore prevent, there are some ways to combat casual vomiting in your cat. Keeping toxins and poisonous substances away from your cat will ensure she is not exposed to them. Feeding her an appropriate and healthy food will keep her stomach happy. Getting your cat vaccinated and routinely using spot or chew treatments can keep infectious agents at bay, and ensure she stays healthy.

Cost of Vomiting

The cost of treating vomiting in your cat can vary considerably, and depends entirely on the severity of your cat’s condition. The average expense for a toxicity will depend on the compound, plant or product; for Cardinal plant poisoning the therapy may average around $500. A medical condition like acute pancreatitis may cost $1000.

Vomiting Questions and Advice from Veterinary Professionals

Indoor Outdoor Tuxedo
12 Months
Serious condition
0 found helpful
Serious condition

Has Symptoms

Loss of Appetite
Hair Loss

Medication Used

aluminium phosphate

3 days ago my one year old male cat started gagging and vomitted. The following day he started gagging again, it sounded a lot like coughing. He vomitted a hairball at 8 am. He vomitted undigested food a 1pm. I took him to the vet who gave him a shot of god know what, then prescribed Antibiotics and Nausea medicine for one week. And Aluminum Phosphate for 3 days. The cat was still eating normally despite vomitting. Today he vomitted bile only, stopped eating yesterday night and he vomitted some foamy liquid as I tried to give him his medicine. I am taking him to the veterinary clinic in 2 hours. He hasen't stopped gagging in 3 days. I don't trust that the vet had diagnosed him well, as he only took his temperature. He had fever and looses a lot of hair. He has been castrated a week ago, and the symptoms have been going on for 3 days.

Another shot and a Hairball paste. I just gave it to him, he is still trying to vomit, not working. I really don't know what to do.
He hasen't eaten all day. He barely drank water now that we got back.
Did not want to lick the paste, and he doesn't even want treats.

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Maine Coon
4 Years
Mild condition
0 found helpful
Mild condition

Has Symptoms

Discharge in Vomit

Medication Used

Oral gel Lysine Supplement

My cat, Dolly, just threw up--not generally a worrying thing for a maine coon. But this time she threw up while she was eating her wet food into her bowl, and instead of a chunk of hair there was a chunk of some sort of clear gel. Really concerned, as I've never seen a cat throw up something like that, but she seems to be otherwise fine. She's also scarfed-and-barfed before, but never into her bowl.

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American Mediumhair
3 Years
Mild condition
1 found helpful
Mild condition

Has Symptoms

lessened appetite

I have two cats, Fluff(3.5 years) and Storm (7 months)and as of this week, I've noticed they don't seem to be eating as much as they normally do and have been throwing up quite often, Fluff more so than Storm but between the two, they've thrown up almost every day this week. They both still seem to be happy, healthy (aside from the issues I just mentioned) and their normal selves, but I can't help but worry something might be wrong.
Just so you have a bit more information to go off of:
I've been feeding them FROMM cat food and switching up the flavor each time they finish a bag. I also give them Sheba Perfect Portions cuts in gravy once or twice a week, also changing up the flavors.
They both still react excitedly to food, especially wet food.
Fluff did have to have an emergency surgery to get a blockage removed from her small intestine back on 12/4/2016 and then spayed the Saturday after Thanksgiving 2017.
Storm was just spayed back on 2/2/2018 at Pima Animal Care Center (the local shelter.) My friend had been fostering her since she was 10 days old and I've had her since December, so I'm wondering if it could be something Storm picked up in the few hours she was there and has spread to Fluff?

Dr. Michele King, DVM
Dr. Michele King, DVM
1610 Recommendations
Thank you for your email. Without examining either cat, I'm not sure what might be causing the vomiting, but if you have just recently gotten Storm, it may be related to her coming in to the house, perhaps they are grooming each other and are showing signs of hairballs. Since they both have decreased appetites, it may be related to a particular bag of food. Parasites are also a possibility, since they are both affected. it might be a good idea to have one, or both of them, examined by a veterinarian, and have stool samples analyzed to make sure that they are free of parasites. If they are both generally healthy and nothing obvious is found on exam, your veterinarian can prescribe a GI food that you can feed them both and see if signs resolve. I hope that all goes well for both of them!

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