Why Is My Cat Vomiting?
Cats vomit more than almost any other pet — but not all vomiting is normal. Here are the 12 most common causes, how to tell occasional from chronic, and when cat vomiting becomes an emergency.
Cats vomit more frequently than most domestic animals, and owners often assume it is normal. While occasional hairball vomiting is genuinely common and usually harmless, frequent vomiting is not normal and should not be accepted as an inevitable part of owning a cat. Chronic vomiting in cats is almost always a sign of an underlying condition — and many of those conditions are very manageable when caught early.
Occasional vs. Chronic Vomiting — The Key Distinction
Occasional (normal)
Once or twice per month, usually hairballs or minor dietary indiscretion. Cat appears well, eating normally, maintaining weight. No blood. No weight loss over time.
Frequent (investigate)
More than once per week consistently. Cat may eat normally but is losing weight. Chronic — has been happening for weeks or months. This pattern always has a medical cause and requires investigation.
Acute (may be emergency)
Sudden onset of repeated vomiting. Cat is lethargic or in distress. Blood present. Cannot keep water down. Always warrants prompt veterinary attention.
🚨 Go to Your Vet Immediately If:
- •Your cat has vomited 3+ times in a few hours and cannot keep water down
- •There is blood in the vomit — bright red or dark brown ('coffee grounds')
- •Your cat is vomiting AND has not urinated in 24+ hours (possible urinary blockage — especially male cats)
- •Your cat is vomiting and appears in pain — crying, hunched, reluctant to be touched
- •Vomiting is accompanied by a distended or hard abdomen
- •Your cat is severely lethargic, cold to touch, or unresponsive between vomiting episodes
- •Your cat has yellow-tinged skin, gums, or whites of the eyes (jaundice)
- •Your cat has eaten a toxic plant, household chemical, medication, or foreign object
- •Your cat has a known health condition (kidney disease, diabetes, hyperthyroidism) and starts vomiting
- •Your cat is a kitten under 6 months — dehydration is dangerous much faster in young cats
12 Common Causes of Vomiting in Cats
These causes are ranked from most to least common in adult cats presenting to general veterinary practice.
Hairballs (Trichobezoars)
Low riskThe most common cause of vomiting in cats. During grooming, cats swallow loose fur which accumulates in the stomach. When the mass becomes too large to pass into the intestine, the cat vomits it up — typically a tubular, cylindrical plug of hair, often wrapped in yellowish bile or mucus. Long-haired breeds (Persians, Maine Coons, Ragdolls) are most prone. Occasional hairballs (once or twice per month) are normal. Frequent hairballs may indicate excessive grooming (anxiety or skin condition) or a coat or digestive issue.
Symptoms:
Retching, gagging with neck extended, followed by production of a tubular hair-and-bile mass. Cat is normal before and after.
Action:
Regular grooming to reduce swallowed hair. Hairball-control food or weekly malt-based hairball paste. If hairballs are more than twice monthly, discuss with your vet.
Eating Too Fast
Low riskCats that eat very quickly swallow air along with food, and the stomach expels both rapidly. The vomited material is usually undigested food, brought up within minutes of eating. This is regurgitation rather than true vomiting (no heaving). Very common in competitive multi-cat households.
Symptoms:
Undigested food vomited immediately or within 15 minutes of eating. Cat wants to eat the vomited material again. Occurs consistently with meals.
Action:
Puzzle feeders, slow-feeder bowls, or spreading kibble on a flat tray. Small frequent meals instead of one or two large ones. Separate cats at mealtimes if competition is the cause.
Dietary Indiscretion or Food Intolerance
MonitorCats can vomit after eating something unusual (hunting prey, eating a housemate's food, accessing the bin) or from an intolerance to a food ingredient. Food intolerances in cats — particularly to chicken, beef, fish, or dairy — often cause chronic low-grade vomiting and skin reactions.
Symptoms:
Vomiting after eating a new food, unusual food, or consistently after a specific food type. May also show diarrhea, skin itching, or ear infections.
Action:
Eliminate suspect food. For suspected food intolerance, discuss a novel protein elimination diet trial (8–12 weeks minimum) with your vet.
Inflammatory Bowel Disease (IBD)
High priorityIBD is one of the most common causes of chronic vomiting in cats, particularly middle-aged to senior cats. The intestinal lining becomes chronically inflamed, impairing nutrient absorption and triggering vomiting. IBD exists on a spectrum — mild cases respond to dietary management; severe cases require immunosuppressive medication. IBD and intestinal lymphoma (lymphoma is the most common feline cancer) can be very difficult to distinguish without biopsy.
Symptoms:
Recurring vomiting over weeks to months. Weight loss despite normal or increased appetite. Intermittent diarrhea. Gurgling bowel sounds. Gradual deterioration.
Action:
Bloodwork, ultrasound, and biopsy (endoscopic or surgical) for definitive diagnosis. Dietary trial with hydrolysed or novel protein food. Prednisolone and/or other immunosuppressants for confirmed IBD.
Kidney Disease (CKD)
CriticalChronic kidney disease is extremely common in cats over 7 years and a leading cause of chronic vomiting in senior cats. Toxin buildup (uremia) directly stimulates the vomiting center in the brain. A cat with CKD that starts vomiting frequently — especially if previously controlled — may be entering a more advanced stage.
Symptoms:
Recurring vomiting, often in the morning or on an empty stomach. Increased thirst and urination, weight loss, poor appetite, lethargy, bad breath (ammonia odor), mouth ulcers.
Action:
Blood and urine tests. Anti-nausea medication (maropitant or ondansetron), kidney diet, phosphorus binders, and hydration support. Annual kidney panels from age 7.
Hyperthyroidism
High priorityExtremely common in cats over 10 years. The overactive thyroid gland accelerates all body systems — including gut motility — causing vomiting, diarrhea, and weight loss despite ravenous appetite. Hyperthyroidism also causes secondary hypertension and heart disease if untreated.
Symptoms:
Vomiting, weight loss despite eating well or being ravenous, hyperactivity, increased thirst and urination, poor coat, heart murmur, diarrhea.
Action:
Thyroid blood panel. Treatment options: daily antithyroid medication (methimazole/carbimazole), radioactive iodine therapy (curative), prescription iodine-restricted diet, or surgery.
Cancer (Especially Intestinal Lymphoma)
CriticalLymphoma is the most common cancer in cats and most frequently affects the gastrointestinal tract — causing chronic vomiting, weight loss, and diarrhea that mimics IBD. The distinction between IBD and low-grade intestinal lymphoma often requires biopsy. Other GI cancers (adenocarcinoma, mast cell tumor) also cause vomiting. Weight loss combined with chronic vomiting in any cat over 8 years always warrants thorough investigation.
Symptoms:
Chronic vomiting over weeks to months. Progressive weight loss. Reduced or variable appetite. Possible palpable abdominal mass. Diarrhea.
Action:
Full physical examination, bloodwork, chest X-ray, abdominal ultrasound. Fine needle aspirate or biopsy for definitive diagnosis. Chemotherapy is often effective for intestinal lymphoma.
Foreign Body or Obstruction
CriticalCats commonly ingest string, thread, hair ties, rubber bands, tinsel, and small toy parts — all of which can cause gastrointestinal obstruction. Linear foreign bodies (string, thread) are particularly dangerous as they can bunch the intestines into an accordion pattern, causing perforation and sepsis. Any cat that suddenly begins vomiting repeatedly without a clear cause should be suspected of having ingested a foreign body.
Symptoms:
Sudden repeated vomiting, anorexia, abdominal pain (hunched posture, sensitivity to touch), lethargy. May have visible string under the tongue.
Action:
Emergency veterinary care. Never pull visible string from the mouth or anus — this can cause internal laceration. X-ray and ultrasound for diagnosis. Endoscopic or surgical removal required.
Toxin Ingestion
CriticalCats are uniquely vulnerable to many common household toxins because they lack certain liver enzymes to process them. True lilies (Easter lily, Tiger lily, Stargazer lily) are rapidly fatal to cats — even pollen or water from the vase. Other dangerous toxins: paracetamol (acetaminophen), essential oils, permethrin (dog flea products applied to cats), xylitol, and many houseplants.
Symptoms:
Sudden vomiting, followed by lethargy, jaundice (yellow eyes/gums), seizures, or collapse depending on the toxin.
Action:
Emergency veterinary care immediately. Bring the packaging or plant. Do not induce vomiting without vet instruction — some toxins cause more damage on the way back up.
Pancreatitis
High priorityInflammation of the pancreas is more common in cats than historically recognized, and often occurs simultaneously with IBD and cholangitis (liver inflammation) — a triad called 'triaditis.' Feline pancreatitis is often subtle and may present simply as lethargy, vomiting, and reduced appetite without the dramatic abdominal pain seen in dogs.
Symptoms:
Vomiting, reduced appetite, lethargy, possible mild abdominal discomfort. Often concurrent with diarrhea or jaundice.
Action:
Blood tests (feline pancreatic lipase — fPLI), ultrasound. Supportive care: IV fluids, anti-nausea medication, pain management, appetite stimulants.
Gastroenteritis (Viral or Bacterial)
MonitorAcute viral or bacterial gastroenteritis causes sudden-onset vomiting and diarrhea, usually self-limiting within 24–72 hours in healthy adult cats. Feline panleukopenia (cat parvovirus) is a severe, potentially fatal form — primarily affecting unvaccinated cats and kittens.
Symptoms:
Acute vomiting, diarrhea, lethargy, reduced appetite, mild fever. Typically resolves within 24–72 hours in healthy adults.
Action:
Supportive care: small amounts of water frequently, bland food after vomiting stops. See vet if: blood present, cat becomes lethargic, or symptoms last more than 48 hours.
Medication Side Effects
MonitorSeveral medications commonly prescribed for cats cause vomiting as a side effect — including antibiotics (metronidazole, clindamycin are common culprits), anti-parasitic medications, and some pain medications. If vomiting began shortly after starting a new medication, it is likely related.
Symptoms:
Vomiting beginning shortly after starting new medication. May improve if medication is given with food.
Action:
Contact your vet. Do not stop prescribed medication without guidance. Anti-nausea medication, a different drug, or a different administration method may resolve the issue.
Managing Hairballs — A Practical Guide
Daily brushing
The single most effective hairball prevention. Removing loose dead fur before your cat swallows it is far more effective than any internal remedy. Long-haired breeds need daily brushing; short-haired cats benefit from 2–3 times per week.
Hairball-control food
These foods have higher fiber content that helps move swallowed hair through the digestive tract rather than allowing it to accumulate in the stomach. Most effective as a complete dietary switch rather than a partial supplement.
Hairball paste (malt extract)
A petroleum jelly or malt-based lubricant given weekly that coats hairballs and helps them pass through the intestines. Effective for most cats. Give on an empty stomach or on a paw for licking. Brand examples: Laxatone, Katavit.
Cat grass
Growing cat grass (wheat or barley grass) for your cat to graze on provides fiber that aids digestion and helps move hair through the gut. Many cats actively seek it out.
When to investigate further
If hairballs are more frequent than twice monthly, if your cat is producing long episodes of unproductive retching without producing a hairball, or if you notice weight loss or appetite changes alongside the vomiting — these warrant a vet check rather than just hairball management.
Vomiting Timeline — When to Act
Monitor at home. Withhold food 2–4 hours. Small amounts of water. Resume bland food. Watch for emergency signs.
Schedule a vet appointment — this is chronic vomiting and has a medical cause that needs investigation.
Call your vet today. Risk of dehydration. May need same-day or next-day assessment.
Go to vet or emergency clinic immediately. Do not wait.
Monitor Your Cat's Body Condition After Illness
Vomiting illnesses — especially chronic ones — cause weight loss that can be gradual and easy to miss. PawScan's photo scan gives you an instant body condition score to track whether your cat is recovering or still declining.
Scan your pet nowFrequently Asked Questions
How often is too often for a cat to vomit?▾
More than once per week consistently is too often and warrants veterinary investigation. Many owners normalise frequent vomiting in cats — 'oh, he's always been a vomiter' — but this is almost always a sign of a treatable underlying condition. Occasional hairball vomiting (once or twice per month) is normal; weekly or daily vomiting is not.
My cat vomits immediately after eating — is this normal?▾
Vomiting undigested food immediately or within minutes of eating suggests eating too fast (regurgitation, not true vomiting). This is common and manageable with slow feeder bowls, puzzle feeders, or smaller more frequent meals. If it happens regardless of feeding speed, or the food is partially digested before vomiting, a GI condition may be involved.
Should I be concerned if my cat vomits bile?▾
Occasional yellow bile vomiting — especially on an empty stomach in the morning — is relatively common in cats and is caused by bile refluxing from the small intestine into the empty stomach. A last meal at night often prevents it. Frequent bile vomiting, or bile vomiting accompanied by weight loss or reduced appetite, should be investigated.
What is the difference between a cat vomiting and coughing up a hairball?▾
They can look similar but are different. Coughing/retching for a hairball involves repeated heaving neck motions without producing much material initially, followed by producing a cylindrical tube of matted fur. True vomiting produces liquid or food content with active abdominal contractions. A cat that retches repeatedly without producing a hairball or vomit may have a respiratory problem (asthma, bronchitis) or an esophageal/gastric issue — worth a vet check.
Is cat vomiting contagious to humans?▾
The vast majority of causes of cat vomiting — IBD, hairballs, kidney disease, hyperthyroidism, food intolerance — are not contagious to humans. Some bacterial infections (Campylobacter, Salmonella) can theoretically be transmitted but this is rare with domestic cats. Always wash hands after cleaning up vomit and handling a sick cat.
My senior cat (12+ years) has started vomiting — what should I do?▾
A senior cat that begins vomiting for the first time, or whose vomiting frequency is increasing, should be seen by a vet within 1–2 weeks. The most likely causes in senior cats are kidney disease, hyperthyroidism, intestinal lymphoma, and IBD — all of which are very manageable when caught early. Request a full senior panel (bloodwork including thyroid, kidney values, and urinalysis) at the appointment.
This article is for educational purposes only. Always consult a licensed veterinarian for medical advice specific to your pet.