Normal vs. Abnormal Vomiting
Occasional vomiting in cats is relatively common, but not all vomiting is "normal." Distinguishing between normal and abnormal vomiting is the first step in determining whether veterinary attention is needed.
| Characteristic | Usually Not a Concern | Veterinary Visit Recommended |
|---|---|---|
| Frequency | Less than 1–2 times per month | Once or more per week |
| Vomit contents | Hairballs, small amounts of undigested food | Blood, yellow/green fluid, foreign objects |
| Behavior after vomiting | Normal activity, eating and drinking as usual | Lethargy, decreased appetite, persistent discomfort |
| Accompanying symptoms | None | Diarrhea, weight loss, repeated unproductive retching |
According to educational materials from the Cornell University College of Veterinary Medicine, if a cat vomits more than once a week, even if the cat appears otherwise normal, a veterinary examination is recommended, as this may be an early sign of an underlying condition.
8 Common Causes of Vomiting
1. Hairballs
Cats ingest hair during grooming, which accumulates in the stomach to form hairballs. This is especially common in longhaired breeds. The vomited material is typically cylindrical and contains visible hair. According to the Journal of Feline Medicine and Surgery, adequate fiber intake and regular brushing can reduce hairball formation.
2. Eating Too Fast
Some cats eat too quickly, causing rapid stomach distension that triggers vomiting. The vomited material is usually nearly undigested food, occurring within minutes of eating. Using a slow-feeder bowl or offering smaller, more frequent meals can help resolve this issue.
3. Food Allergies or Intolerances
According to a study published in Veterinary Dermatology (Guilford et al., 2001), the most common food allergens in cats include beef, dairy products, and fish. Vomiting caused by food allergies tends to be recurrent and may be accompanied by skin itching or diarrhea.
4. Switching Food Too Quickly
Abrupt diet changes can upset the gastrointestinal system. A gradual transition over 7–10 days is recommended, starting with 25% new food and gradually increasing the proportion.
5. Ingestion of Foreign Objects
Rubber bands, thread, plastic bag fragments, and other foreign objects can cause gastrointestinal obstruction when swallowed. If a cat is vomiting persistently, unable to eat, and has recently had access to such items, seek veterinary care immediately. According to ASPCA data, linear foreign bodies (such as thread and yarn) are among the most dangerous types of foreign objects for cats, as they can cause intestinal intussusception.
6. Gastroenteritis
Bacterial, viral, or parasitic infections can all trigger acute gastroenteritis, often accompanied by vomiting and diarrhea. Kittens and cats that have not completed their vaccination series are at higher risk.
7. Chronic Diseases
Chronic kidney disease (CKD), hyperthyroidism, inflammatory bowel disease (IBD), and pancreatitis can all present with vomiting as an early symptom. According to ISFM guidelines,cats over 10 years of age that experience increased vomiting frequency should undergo a comprehensive evaluation including blood work and imaging.
8. Ingestion of Toxic Substances
Lilies, certain human medications (such as ibuprofen), chocolate, and onions are toxic to cats. The ASPCA Animal Poison Control Center database lists over 1,000 substances potentially toxic to cats. If poisoning is suspected, seek veterinary care immediately.
Warning Signs That Require Immediate Veterinary Attention
If any of the following occur, take your cat to the veterinarian immediately:
- Vomit contains bright red blood or coffee ground-like material (gastrointestinal bleeding)
- Persistent vomiting for more than 24 hours
- Repeated unproductive retching (possible foreign body obstruction or gastric torsion)
- Accompanied by severe diarrhea, extreme lethargy, or complete refusal to eat
- Suspected ingestion of foreign objects or toxic substances
- Vomiting in kittens (under 6 months old), as the risk of dehydration is higher
Daily Care to Prevent Cat Vomiting
- Regular brushing: At least 2–3 times per week; daily brushing is recommended for longhaired cats to reduce hair ingestion
- Smaller, more frequent meals: Divide daily food intake into 2–3 meals, or use a slow-feeder bowl
- Gradual food transitions: Allow 7–10 days for a slow transition when switching foods
- Environmental safety: Store rubber bands, string, plastic bags, and other small swallowable items out of reach
- Regular health checkups: Annually for adult cats, every 6 months for cats 7 years and older, to detect potential issues early
- Remove toxic plants: Lilies, pothos, poinsettias, and other common household plants are toxic to cats
References
- Cornell University College of Veterinary Medicine. Vomiting in Cats. Cornell Feline Health Center.
- Guilford, W.G. et al. (2001). Food sensitivity in cats with chronic idiopathic gastrointestinal problems. Journal of Veterinary Internal Medicine, 15(1), 7-13.
- ASPCA Animal Poison Control Center. Toxic and Non-Toxic Substances database.
- International Society of Feline Medicine (ISFM). Vomiting in cats: When to worry.