Why Is My Cat Throwing Up? 11 Common Causes

Cat Vomiting: Common but Not Always Normal

Cats are known for vomiting more frequently than other pets, and many cat owners accept it as “just a cat thing.” While occasional vomiting can be normal, frequent or severe vomiting always has an underlying cause - and some of those causes require veterinary attention.

Here are the 11 most common reasons your cat might be throwing up, from benign to serious.

1. Hairballs

The most common cause of vomiting in cats. When cats groom themselves, they swallow loose fur. Most of it passes through the digestive tract, but some accumulates in the stomach and gets vomited up as a tubular mass of hair.

Normal if: Happens once or twice a month, produces a recognizable hairball, and your cat otherwise feels fine.

Reduce hairballs by: Regular brushing, hairball-formula food, and hairball treats or paste.

2. Eating Too Fast

Cats who gobble their food may vomit it back up almost immediately. The food is usually undigested and tubular-shaped (following the shape of the esophagus). This is regurgitation rather than true vomiting.

Solutions:

• Use a slow feeder bowl or puzzle feeder
• Feed smaller, more frequent meals
• Spread food on a flat plate instead of a deep bowl
• Separate cats if competition causes speed-eating

If speed-eating is a recurring issue, a timed automatic feeder can help by splitting meals into smaller, scheduled portions throughout the day. We compared several options in our automatic cat feeder guide — this is a straightforward one that works well:

3. Dietary Indiscretion

Cats are curious creatures. Eating something unusual - a houseplant, a rubber band, a piece of string, or a new treat - can trigger vomiting as the stomach tries to expel the foreign material.

When to worry: If you suspect your cat swallowed string, ribbon, tinsel, or any linear foreign body, see your vet immediately. These can cause life-threatening intestinal damage.

4. Food Sensitivities or Allergies

Some cats develop sensitivities to specific proteins or ingredients in their food. Chronic vomiting (especially with diarrhea) that improves on a different diet suggests a food intolerance.

Common culprits: Chicken, fish, beef, dairy, wheat, corn, and soy.

Next step: An elimination diet trial under veterinary guidance can identify the trigger.

5. Sudden Diet Change

Switching your cat’s food abruptly is a common cause of vomiting. Cats have sensitive digestive systems that need time to adapt.

Prevention: Always transition to new food gradually over 7-10 days, mixing increasing proportions of new food with the old.

6. Gastritis (Stomach Inflammation)

Gastritis can be caused by eating too fast, food intolerance, toxins, medications, or infections. It causes nausea and vomiting, sometimes with loss of appetite and lethargy.

Acute gastritis: Usually resolves within 24-48 hours with a bland diet.

Chronic gastritis: Persistent inflammation that requires veterinary diagnosis and treatment.

7. Intestinal Parasites

Worms and other parasites can cause vomiting, especially in kittens and outdoor cats. Roundworms, in particular, may be visible in vomit.

Other signs: Diarrhea, weight loss, bloated belly, poor coat condition.

Treatment: A fecal test at the vet identifies the parasite type, and appropriate deworming medication resolves it.

8. Inflammatory Bowel Disease (IBD)

IBD is a chronic condition where the gastrointestinal tract becomes infiltrated with inflammatory cells. It causes recurrent vomiting, diarrhea, weight loss, and poor appetite.

Diagnosis: Requires blood work, imaging, and sometimes intestinal biopsies.

Treatment: Dietary management, corticosteroids, and sometimes immunosuppressive medications.

9. Hyperthyroidism

One of the most common endocrine disorders in cats over 8 years old, hyperthyroidism often causes vomiting alongside increased appetite, weight loss, increased thirst, and hyperactivity.

Diagnosis: A simple blood test (T4 level) at your vet.

Treatment: Medication (methimazole), radioactive iodine therapy, surgery, or prescription diet.

10. Kidney Disease

Chronic kidney disease (CKD) is extremely common in senior cats and causes nausea, vomiting, increased thirst, decreased appetite, and weight loss. Toxins that healthy kidneys would filter out build up and cause nausea.

Diagnosis: Blood work and urinalysis.

Management: Prescription renal diet, fluid therapy, medications to manage symptoms.

11. Intestinal Obstruction

If your cat swallowed a foreign object that’s blocking the intestinal tract, they’ll vomit repeatedly and become increasingly ill. This is a medical emergency.

Signs of obstruction:

• Repeated vomiting (every few hours)
• Complete loss of appetite
• Painful abdomen
• Lethargy
• No stool production
• Straining with no result

Action: Immediate veterinary care required. Surgery is often necessary.

Vomiting vs. Regurgitation

Understanding the difference helps your vet diagnose the problem:

	Vomiting	Regurgitation
Effort	Active heaving, abdominal contractions	Passive, effortless
Timing	Any time after eating	Usually soon after eating
Content	Digested or partially digested food, bile	Undigested food, tube-shaped
Cause	Stomach/intestinal issues	Esophageal issues, eating too fast

When to See the Vet

See your vet if your cat:

• Vomits more than 2-3 times in 24 hours
• Has been vomiting regularly for more than a week
• Vomits blood or dark “coffee ground” material
• Is also lethargic, not eating, or losing weight
• Has diarrhea along with vomiting
• May have swallowed a foreign object
• Is a kitten (dehydration happens fast)
• Shows abdominal pain (hunched posture, crying when touched)

Go to an emergency vet if: Vomiting is continuous, there’s blood, your cat is in obvious distress, or you suspect poisoning or a foreign body.

Home Care for Mild Vomiting

If your cat vomits once and is otherwise acting normal:

1. Withhold food for 4-6 hours (keep water available)
2. Offer a small amount of bland food - plain boiled chicken or a veterinary bland diet
3. Monitor closely for additional vomiting, lethargy, or diarrhea
4. Resume normal diet gradually if no more vomiting occurs

Preventing Vomiting

• Feed smaller, more frequent meals using a slow feeder
• Brush your cat regularly to reduce hairball frequency
• Transition foods gradually over 7-10 days
• Keep dangerous objects out of reach - string, rubber bands, hair ties, tinsel
• Regular vet checkups - especially for cats over 7 years old
• Maintain a consistent diet - avoid frequent changes

The Bottom Line

Occasional vomiting in cats isn’t unusual, but it should never be dismissed as “normal.” Pay attention to frequency, severity, and accompanying symptoms. One hairball a month is fine - daily vomiting, blood in vomit, or vomiting combined with other symptoms always warrants a vet visit. Early diagnosis often leads to simpler, more effective treatment.