Cats vomit more frequently than almost any other domestic animal — and for a wider range of reasons. For many cat owners, occasional vomiting becomes so commonplace that it is accepted as a normal part of life with a cat. The reality is more nuanced. While some vomiting in cats is genuinely benign and self-limiting, persistent, frequent, or severe vomiting is never simply something to accept without investigation.
If your cat has been vomiting repeatedly, has not eaten, or you are concerned about the frequency or nature of the vomiting, contact Walker Lake Veterinary Centre at (587) 786-6771.
Frequent vomiting is not normal in cats — it is a sign that something needs attention. Cats that vomit more than once or twice per month, or that show other symptoms alongside vomiting, always warrant veterinary assessment rather than acceptance as a normal quirk.
Vomiting vs Regurgitation vs Hairballs — Key Distinctions
Before investigating why a cat is vomiting, it is important to correctly identify what is actually happening. Vomiting, regurgitation, and hairball expulsion are distinct processes that are often confused.
Vomiting
True vomiting is an active process. The cat shows visible signs of nausea beforehand — salivating, swallowing repeatedly, licking their lips, or becoming restless. Abdominal contractions are visible as the stomach contents are forcefully expelled. The material produced is partially digested food, bile, or foam and typically has an acidic smell.
Regurgitation
Regurgitation is passive — no retching or abdominal effort occurs. Food or fluid flows back from the oesophagus with no warning signs, often immediately after eating. The material is undigested — often tube-shaped, retaining the shape of the oesophagus — and has no sour smell. Regurgitation suggests an oesophageal problem rather than a stomach issue.
Hairball Expulsion
Hairball expulsion is a specific type of vomiting that cats perform to eliminate accumulated hair from the stomach. The cat retches and heaves, often for an extended period before producing a cylindrical mass of compacted hair — sometimes mixed with bile or food. Occasional hairballs in long-haired cats or heavy groomers are generally normal. Frequent hairballs — more than once a month — or hairballs accompanied by other symptoms warrant investigation.
The classic elongated hairball shape is produced by compression in the oesophagus during expulsion — the actual mass forms in the stomach. Cats that produce only bile or foam despite extended retching may have a hairball that cannot be expelled, requiring veterinary attention.
Assessing the Severity of Vomiting
Several factors determine the clinical significance of vomiting in cats.
Frequency
- Once or twice per month — may be acceptable in otherwise healthy cats, particularly long-haired breeds prone to hairballs
- Weekly — warrants veterinary assessment
- Daily or multiple times per day — significant, requires prompt veterinary attention
Content of the Vomit
- Partially digested food — common, context-dependent
- Yellow or green bile — indicates the stomach is empty; more concerning when frequent
- White foam — stomach mucus and air; suggests an empty, irritated stomach
- Blood — bright red or coffee ground appearance; always requires urgent veterinary assessment
- Undigested food — suggests regurgitation rather than vomiting
- Hair — typical hairball; frequency determines significance
- Foreign material — plastic, fabric, plant material; suggests foreign body ingestion
Accompanying Symptoms
Vomiting alongside any of the following significantly increases urgency:
- Lethargy or weakness
- Loss of appetite lasting more than 24 hours
- Weight loss — even if gradual
- Diarrhoea
- Increased or decreased water consumption
- Changes in urination
- Abdominal pain or distension
- Jaundice — yellow tinge to gums, skin, or whites of eyes
Common Causes of Vomiting in Cats
Eating Too Fast
One of the most common causes of vomiting in cats. A cat that eats rapidly swallows air and food quickly, distending the stomach and triggering an immediate vomiting reflex. The vomited material is typically undigested or barely digested food brought up within minutes of eating.
Management includes puzzle feeders, slow-feeder bowls, feeding from a flat plate rather than a deep bowl, and dividing the daily ration into smaller, more frequent meals.
Dietary Causes
- Dietary change — abrupt food transitions commonly cause vomiting; always change food gradually over 7 to 10 days
- Food intolerance — a reaction to a specific ingredient causing gastrointestinal upset
- Rich or unfamiliar food — cats that eat human food, particularly fatty or unusual items, often vomit
- Spoiled food — cats are sensitive to food freshness; stale wet food can cause vomiting
Hairballs
Cats groom themselves constantly, swallowing large amounts of hair. Most passes through the gastrointestinal tract and is excreted in faeces. Some accumulates in the stomach and is periodically expelled as hairballs.
While occasional hairballs are normal, frequent hairball vomiting — more than once a month — suggests excessive hair accumulation that warrants investigation. This may be driven by excessive grooming related to skin disease or stress, or by reduced gastrointestinal motility that fails to move hair through normally.
Management of frequent hairballs includes:
- Regular brushing to reduce ingested hair volume
- Hairball-specific diets with increased fibre to promote hair passage
- Hairball lubricants — petroleum-based products administered orally that help hair pass through the gastrointestinal tract
- Investigating underlying causes of excessive grooming
Gastritis
Inflammation of the stomach lining causes vomiting, nausea, and reduced appetite. Acute gastritis is most commonly caused by dietary indiscretion — eating something unusual or inappropriate. Chronic gastritis — persistent or recurrent stomach inflammation — requires investigation for underlying causes including food allergy, Helicobacter infection, or inflammatory bowel disease.
Foreign Body Ingestion
Cats are attracted to string, thread, rubber bands, ribbon, tinsel, and small toys — any of which can be swallowed and cause obstruction. Linear foreign bodies — string and thread — are particularly dangerous. A cat that has swallowed thread or string may have one end caught around the base of the tongue while the rest extends through the intestine, causing the intestine to bunch or perforate as the cat moves.
Signs of foreign body obstruction include persistent vomiting, complete loss of appetite, lethargy, and abdominal pain. This is a surgical emergency.
⚠️ If you see thread, string, or ribbon hanging from your cat’s mouth or anus — do not pull it. This can cause severe internal injury. Go to Walker Lake Veterinary Centre immediately at (587) 786-6771.
Inflammatory Bowel Disease
IBD is one of the most common causes of chronic vomiting in middle-aged and older cats. It involves persistent immune-mediated inflammation of the gastrointestinal tract — most commonly the stomach and small intestine. Cats with IBD typically vomit intermittently over months to years, often alongside weight loss despite a maintained or increased appetite.
Diagnosis requires biopsy — either via endoscopy or surgical full-thickness biopsy. Management involves dietary modification and immunosuppressive medication.
Kidney Disease
Chronic kidney disease (CKD) is extremely common in older cats and one of the leading causes of vomiting in this age group. As kidney function declines, toxins accumulate in the bloodstream causing nausea and vomiting. Vomiting from kidney disease is typically accompanied by increased thirst and urination, weight loss, and lethargy.
Any older cat with vomiting should have kidney function assessed as a priority.
Hyperthyroidism
The most common hormonal disease in older cats. An overactive thyroid gland produces excess thyroid hormone, increasing metabolism dramatically. Vomiting is a common sign alongside weight loss despite increased appetite, increased activity and restlessness, increased thirst, and a poor coat.
Hyperthyroidism is highly treatable — medical, dietary, radioactive iodine, and surgical options are available.
Pancreatitis
Inflammation of the pancreas causes vomiting, lethargy, reduced appetite, and abdominal pain in cats. Pancreatitis in cats is often more subtle in its presentation than in dogs — cats may simply appear quieter and less interested in food without dramatic vomiting. It is frequently associated with inflammatory bowel disease and cholangitis (liver inflammation) — a combination called triaditis.
Hepatic Lipidosis — Fatty Liver Disease
A serious and potentially fatal condition unique to cats. When a cat stops eating for any reason — even for 2 to 3 days — the liver begins mobilising fat stores rapidly. In cats, this fat accumulates in the liver faster than it can be processed, causing hepatic lipidosis — liver failure from fat accumulation.
Hepatic lipidosis causes jaundice, profound lethargy, vomiting, and complete anorexia. It is a medical emergency. Any cat that has not eaten for more than 48 hours requires urgent veterinary assessment.
Toxin Ingestion
Many household plants, foods, and substances are toxic to cats. Lilies are of particular concern — even pollen contact can cause acute kidney failure. Vomiting is a common early sign of toxin ingestion.
Intestinal Parasites
Roundworms, hookworms, and Giardia can cause vomiting alongside diarrhoea in cats — particularly in younger animals. Regular faecal testing and deworming are important preventive measures.
Cat Diarrhoea
While this article focuses on vomiting, it is worth noting that vomiting and diarrhoea frequently occur together in cats. The combination is more clinically significant than either alone and significantly increases the risk of dehydration.
Common causes of diarrhoea in cats include:
- Dietary change or indiscretion
- Intestinal parasites — particularly Giardia and roundworms
- Inflammatory bowel disease
- Food allergy or intolerance
- Hyperthyroidism — accelerated gut transit causes loose stools
- Kidney disease — toxin accumulation affects gut motility
- Stress colitis — stress is a significant trigger for large bowel diarrhoea in cats
- Viral infections — feline panleukopenia, coronavirus
Diarrhoea in a cat lasting more than 24 to 48 hours, or accompanied by blood, lethargy, or vomiting, warrants veterinary assessment the same day.
When Is Cat Vomiting an Emergency?
Go to the veterinary clinic immediately if your cat:
- Is vomiting blood — bright red or coffee ground appearance
- Has a distended or painful abdomen
- Is showing signs of severe lethargy or weakness — cannot stand normally
- Has pale, white, yellow, or blue-tinged gums
- Has known or suspected foreign body ingestion — particularly string or thread
- Has known or suspected toxin exposure
- Is vomiting and has not eaten for more than 24 hours
- Has been vomiting frequently with no improvement over 12 to 24 hours
- Is a kitten — young cats dehydrate rapidly
When to Book a Same-Day Appointment
- Vomiting more than 3 times in 24 hours
- Vomiting alongside reduced appetite or lethargy
- Vomiting accompanied by changes in water consumption or urination
- An older cat vomiting more than once or twice in a week
- Any cat losing weight alongside vomiting
When to Monitor at Home
- A single vomit in an otherwise bright, active cat with normal appetite
- Occasional hairball expulsion — less than once a month — in a long-haired cat
- Vomiting once after eating too quickly with immediate return to normal behaviour
Diagnosing the Cause of Vomiting
History and Physical Examination
A thorough history — frequency, content, timing relative to meals, associated symptoms, diet, access to toxins or foreign material, vaccination and deworming status — combined with a complete physical examination provides significant diagnostic information.
Bloodwork and Urinalysis
A complete blood count, biochemistry panel, and urinalysis assesses kidney and liver function, thyroid level, blood glucose, electrolytes, and markers of infection and inflammation. In an older vomiting cat, thyroid testing and kidney function assessment are priorities.
Imaging
Abdominal X-rays detect foreign bodies, abnormal gas patterns, and organ size changes. Abdominal ultrasound provides detailed assessment of gastrointestinal wall thickness, intestinal motility, organ structure, and lymph node size — all valuable in investigating chronic vomiting.
Endoscopy and Biopsy
For chronic or recurrent vomiting where initial diagnostics do not identify a clear cause, endoscopy allows direct visualisation and biopsy of the stomach and intestinal lining. Biopsy is required to diagnose inflammatory bowel disease and to distinguish it from intestinal lymphoma — an important distinction as they require different treatment approaches.
If your cat has been vomiting repeatedly or alongside other symptoms, book an appointment at Walker Lake Veterinary Centre. Call (587) 786-6771 or book online. Located at 5109 22 Avenue SW, Southwest Edmonton.
Book an Appointment at Walker Lake Veterinary Centre
Walker Lake Veterinary Centre provides comprehensive gastrointestinal assessment for cats and dogs across Walker Lake, Summerside, Ellerslie, Heritage Valley, and Southwest Edmonton.
Call us at (587) 786-6771 or book online. We are located at 5109 22 Avenue SW, Edmonton.
Clinic hours:
- Monday, Tuesday & Thursday: 9:00 AM – 7:00 PM
- Wednesday & Friday: 9:00 AM – 6:00 PM
- Saturday: 9:00 AM – 3:00 PM
- Sunday: Closed
Frequently Asked Questions
Is it normal for cats to vomit every week?
No. Weekly vomiting in a cat is not normal and warrants veterinary investigation. While occasional vomiting — particularly hairballs in long-haired cats — can be acceptable, any cat vomiting weekly has an underlying cause that should be identified and addressed. Common causes in older cats include hyperthyroidism, kidney disease, and inflammatory bowel disease — all of which are highly manageable when diagnosed.
Why does my cat vomit immediately after eating?
Vomiting immediately after eating — within minutes of a meal — is typically caused by eating too quickly. The rapid distension of the stomach triggers a vomiting reflex. Management includes slow-feeder bowls, puzzle feeders, and smaller more frequent meals. If the problem persists despite these measures, or if the vomited material is undigested and tube-shaped, oesophageal disease should be investigated.
My cat is vomiting but still eating and acting normally — should I be worried?
A cat that is vomiting but otherwise bright, alert, and maintaining their appetite and weight is less immediately concerning than one showing other symptoms. However, vomiting more than once or twice a month in an otherwise well cat still warrants a veterinary check — particularly in cats over 7 years old where hyperthyroidism and kidney disease become increasingly common.
Can stress cause vomiting in cats?
Yes. Cats are sensitive to environmental and routine changes, and stress is a recognised cause of acute vomiting and gastrointestinal upset. Common stressors include rehoming, new family members, building work, changes in routine, and multi-cat household tensions. Stress-related vomiting typically resolves once the stressor is removed, but chronic stress warrants attention to reduce the impact on feline health.
What should I do if my cat vomits blood?
Blood in vomit — whether bright red or resembling coffee grounds (digested blood) — always requires same-day veterinary assessment. Bright red blood suggests active bleeding from the mouth, oesophagus, or stomach. Coffee ground material suggests digested blood from the upper gastrointestinal tract. Both are serious findings that require prompt investigation.
