CATS · Symptom guide
Cat not eating: what published veterinary cases tell us
A cat that won't eat for more than 24-36 hours is a clinical problem, full stop. Cats — unlike dogs — can develop hepatic lipidosis (fatty liver) within a few days of not eating, which is itself a life-threatening complication. So even when the underlying cause is mild, the not-eating part needs prompt attention.
Published case series identify a short list of conditions that vets see again and again: pancreatitis, inflammatory bowel disease (IBD), chronic kidney disease, dental disease, gastric foreign body, alimentary lymphoma, and — in middle-aged cats — hepatic lipidosis itself as a secondary process.
Below are real veterinary case reports of cats presenting with anorexia. Each shows the workup, the diagnosis, and what treatment moved the cat back to eating.
When to see a vet now
- No food at all for 24+ hours, or significantly reduced for 3+ days.
- Hiding, hunched posture, or sitting over the water bowl without drinking.
- Jaundice — yellow tint to the gums, ears, or whites of the eyes.
- Vomiting alongside the inappetence.
- Overweight cat suddenly stops eating (highest hepatic lipidosis risk).
Real cases from the veterinary literature
A teaser of peer-reviewed reports our semantic search surfaces for this complaint. Click into any case for the full abstract — or run a personalised search with your pet's exact details.
- Persistent nonregenerative anemia in a 4-year-old cat.
Veterinary clinical pathology · 2020 · United States
A 4-year-old male neutered domestic shorthair cat was taken to The Ohio State University College of Veterinary Medicine because he had been losing weight, seemed very tired, and had anemia (a low red blood cell count) for the past two months. Tests showed he had severe anemia that wasn't improving, high levels of waste in his blood, and issues with his urine, including protein.
- Evaluation of Weight Loss Over Time in Cats with Chronic Kidney Disease.
Journal of veterinary internal medicine · 2016 · United States
In a study involving 569 cats with chronic kidney disease (CKD), researchers looked at how weight loss occurred over time, both before and after the diagnosis. They found that the average age of these cats at diagnosis was about 15 years, and many had already lost weight in the year leading up to their diagnosis. In fact, some cats showed signs of weight loss as early as three
- Feline porphyria associated with anemia, severe hepatic disease, and renal calculi.
The Canadian veterinary journal = La revue veterinaire canadienne · 2010 · Canada
A 13-year-old neutered male domestic cat was brought in because he was losing weight, had low red blood cell counts (anemia), and an enlarged liver (hepatomegaly). The vet found specific signs that indicated he had porphyria, a condition related to problems with blood pigments. Unusually, the cat also had kidney stones that looked like charcoal and serious liver damage, which h
- Management of anorexia in the cat.
Journal of feline medicine and surgery · 2001 · United States
Many cat owners bring their pets to the vet because they notice their cat isn't eating normally, which is called anorexia (a lack of appetite). This can happen for various reasons, and understanding why a cat stops eating can be complicated. Factors like changes in the cat's environment, diet, or even how their body signals hunger can all play a role. It's crucial for veterinar
- Juvenile hyperthyroidism in a cat.
Journal of the American Animal Hospital Association · 2003 · United States
An 8-month-old male domestic shorthaired cat was brought to the vet because he was losing weight, having trouble breathing sometimes, experiencing chronic diarrhea, being overly active, and feeling weak. The vet found a lump on his thyroid and noticed high levels of certain thyroid hormones in his blood, leading to a diagnosis of hyperthyroidism (an overactive thyroid). The cat
Frequently asked questions
- How long can a cat go without eating safely?
- A healthy adult cat shouldn't go more than 24-36 hours without food. Beyond that, the risk of hepatic lipidosis (fatty liver) rises — especially in overweight cats. Kittens and seniors have even less margin. If your cat hasn't eaten in 24 hours, call your vet.
- What's the most common cause vets find?
- Across published case series, the most common identifiable causes are: pancreatitis (often missed on routine bloodwork — needs feline pancreatic lipase), IBD, dental pain, chronic kidney disease in older cats, and gastrointestinal foreign body. Stress and recent diet change are common in younger cats with otherwise normal workups.
- Will an appetite stimulant fix it?
- Appetite stimulants (mirtazapine, capromorelin) buy time while you investigate — they don't fix the underlying problem. Several of the cases below show how stimulants kept cats nutritionally stable while the diagnostic workup found the real cause.