Cat Fatty Liver Disease (Hepatic Lipidosis): Signs
Hepatic lipidosis, or fatty liver disease, is the most common severe liver condition in cats and develops when a cat stops eating. Fat floods the liver faster than it can process, causing it to fail. The good news: with aggressive early nutritional support, the majority of cats recover. The danger lies in any cat that won't eat.
Last reviewed: June 2026
What Is Hepatic Lipidosis in Cats?
Hepatic lipidosis is a life-threatening condition in which fat accumulates inside liver cells, swelling the liver and impairing its function. It develops uniquely in cats because of their specialized fat metabolism: when a cat stops eating, the body mobilizes stored fat to the liver for energy, but the feline liver cannot process that flood of fat efficiently, so it backs up inside the cells and the liver begins to fail.
The key triggering event is almost always a period of not eating—often itself caused by another illness, a stressful change, or a new diet the cat refuses. As described in the feline hepatic lipidosis literature, overweight cats are at especially high risk because they have more fat to mobilize. Any cat that stops eating for several days can develop this condition, which is why feline anorexia is never taken lightly (Chan, 2009, JFMS).
What Are the Signs of Fatty Liver Disease?
The hallmark of hepatic lipidosis is a cat that has stopped eating and is becoming progressively weaker and jaundiced. The disease usually follows several days of poor or absent appetite.
Signs to watch for include:
- Refusing food for two or more days
- Rapid weight loss with hanging skin
- Yellowing of the gums, skin, or whites of the eyes (jaundice)
- Lethargy and weakness
- Vomiting or drooling
- Drooping head and neck weakness (a sign of related deficiency)
- Dehydration
Jaundice is a particularly important warning sign; once the gums or eyes look yellow, the liver is significantly compromised and emergency care is needed. As few as two to seven days of not eating can be enough to trigger the disease in a susceptible cat (Valtolina & Favier, 2017, JFMS).
Why Does It Happen?
Hepatic lipidosis is set off by any condition that causes a cat to stop eating, combined with the cat's distinctive liver metabolism. Common underlying triggers include pancreatitis, inflammatory bowel disease, diabetes, kidney disease, cancer, dental pain, or simply the stress of a move, a new pet, or an abrupt diet change. As described in Ettinger's Textbook of Veterinary Internal Medicine, the disease is often "secondary," meaning treating the original illness is part of the cure.
Because the root cause is not eating, prevention comes down to never letting a cat go without food for more than a day or two without investigation.
How Is It Treated?
The cornerstone of treatment is aggressive nutritional support—getting calories back into the cat, usually through a feeding tube. Force-feeding by syringe is rarely sufficient and often stressful, so most cats are managed with a temporary esophagostomy tube that allows reliable, low-stress feeding at home.
Treatment also includes:
- Fluid therapy to correct dehydration and electrolyte imbalances
- Anti-nausea medication to control vomiting
- Vitamin and supplement support (such as B12 and others) as needed
- Diagnosing and treating the underlying disease that caused the anorexia
With committed feeding-tube support, recovery rates are high—often 80% or better—but the process can take weeks of dedicated home care. The earlier nutrition is restored, the better the outcome.
When to See a Vet
Call your vet today if:
- Your cat hasn't eaten normally in more than 24 hours
- You notice rapid weight loss, drooling, or vomiting in a cat that's off its food
- Your cat seems weak or unusually withdrawn after skipping meals
Go to the ER immediately if:
- Your cat's gums, skin, or eyes look yellow (jaundice)
- Your cat is severely weak, collapsed, or unresponsive
- Your cat has not eaten at all for more than 48–72 hours
- Your cat is vomiting repeatedly and cannot keep anything down
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Frequently Asked Questions
How long can a cat go without eating before fatty liver develops?
Susceptible cats—especially overweight ones—can begin developing hepatic lipidosis after just two to seven days without adequate food. This is why feline anorexia is treated so urgently. If your cat hasn't eaten properly for more than 24 to 48 hours, contact your vet rather than waiting to see whether the appetite returns on its own.
Can a cat recover from fatty liver disease?
Yes—with aggressive, early nutritional support, often through a feeding tube, recovery rates are commonly 80% or higher. The key is restoring calories quickly and treating whatever underlying illness stopped the cat from eating. Recovery typically takes several weeks of dedicated home feeding, but most cats that get prompt care return to full health.
How much does treating feline hepatic lipidosis cost?
Diagnosis with bloodwork and ultrasound runs $300–700, and placing a feeding tube under anesthesia costs $400–900. Initial hospitalization with fluids and supportive care often runs $500–1,500 per day, so the first week can total $2,000–5,000. Home feeding-tube care afterward is much cheaper but requires weeks of commitment.
Why won't my cat eat after a stressful change?
Cats are highly sensitive to stress, and events like moving, a new pet, boarding, or a sudden diet change can suppress appetite. The danger is that even stress-related anorexia can trigger fatty liver if it lasts several days. If a stressed cat refuses food for more than a day or two, treat it as a medical concern and call your vet.
Is hepatic lipidosis the same as liver failure?
Hepatic lipidosis is a specific cause of liver dysfunction in which fat overwhelms the liver cells, and untreated it can progress to true liver failure. Unlike many causes of liver failure, it is often reversible because the liver tissue is fundamentally intact—if nutrition is restored quickly, the fat clears and liver function recovers.
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