Why Has My Cat Stopped Eating? Risks (Including Hepatic Lipidosis) and What to Do

Cats who stop eating can be sick — anorexia for 24–48 hours risks fatty liver (hepatic lipidosis). Seek veterinary care early; learn causes, what to watch, and next steps.

When to See a Vet

Always consult your veterinarian first when your cat stops eating. Loss of appetite (anorexia) in cats often signals an underlying medical problem. Importantly, cats are at risk of developing hepatic lipidosis (fatty liver disease) after a short period of not eating — particularly if they are overweight. If your cat refuses food for 24 hours, call your vet; if anorexia reaches 48 hours, bring your cat in immediately for evaluation and possible hospital care.

(Continued veterinary guidance and diagnostics are essential before assuming a purely behavioral cause.)

Why this matters: the 24–48 hour rule and hepatic lipidosis

Cats metabolize fat differently than dogs and people. When a cat stops eating, the body mobilizes fat for energy. In some cats — especially overweight cats — fat accumulates in liver cells and triggers hepatic lipidosis, a potentially life‑threatening condition that can progress rapidly. Early veterinary intervention (fluids, nutritional support and treating the underlying cause) greatly improves outcomes. Because of this risk, prompt assessment is critical (Merck Veterinary Manual).

Medical Causes

Many medical problems cause reduced appetite. Common and important medical causes include:

• Dental/oral pain: tooth resorption, periodontal disease, oral ulcers, stomatitis — cats with mouth pain will often drop food, drool, paw at the mouth, or avoid dry food.
• Gastrointestinal disease: inflammatory bowel disease, foreign bodies/obstruction, gastritis, pancreatitis.
• Hepatic disease: hepatic lipidosis, cholangitis, hepatitis, neoplasia.
• Renal disease: acute or chronic kidney disease often causes nausea and decreased appetite.
• Infection/inflammation: systemic infections (viral, bacterial, FIP) and inflammatory conditions.
• Metabolic/endocrine disease: diabetes mellitus, hypoadrenocorticism, hypercalcemia (which decreases appetite), though hyperthyroidism typically increases appetite.
• Neoplasia: cancers (especially of the GI tract, pancreas or systemic malignancies) commonly decrease appetite.
• Nausea, medication side effects or toxin exposure: many drugs and household toxins can cause nausea and anorexia.
• Pain elsewhere: arthritis, injury or abdominal pain can reduce appetite.

Behavioral Causes

Not all appetite changes are medical. Behavioral or environmental factors include:

• Stress or environmental change: new people or pets, moving house, new furniture, loud noises, or changes in feeding location can cause a cat to avoid food for a time (AVSAB guidance on feline stress).
• Food aversion: if eating caused vomiting or discomfort once, a cat may learn to avoid that food thereafter.
• Food preference or poor palatability: cats are often finicky; a change of diet, brand, formula, texture, or spoiled food may lead to refusal.
• Social or feeding competition: multi‑cat households where a dominant cat prevents others from eating.
• Routine disruption: altered feeding schedule, different bowls, or feeding location changes.

How to Tell Medical vs Behavioral Causes

Look for clues in the whole clinical picture. Medical causes are more likely when one or more of the following are present:

• Systemic signs: lethargy, hiding, weakness, rapid breathing, fever.
• Gastrointestinal signs: vomiting, diarrhea, constipation, abdominal pain.
• Changes in drinking: increased or decreased water intake, change in urination.
• Oral signs: drooling, pawing at the mouth, bad breath, blood in saliva.
• Neurologic signs: disorientation, seizures.
• Rapid or chronic weight loss, dehydration, pale or yellow gums (jaundice).

• The cat will eat high‑value foods (treats, canned tuna) but refuses regular food.
• Appetite loss started after a clear environmental change (new pet, move) and the cat otherwise seems bright and active.
• The issue is intermittent or specific to one food type or location.

What to Observe (Information to Gather for Your Vet)

Collect clear, specific details to help your veterinarian diagnose the cause:

• Onset and duration: when did decreased eating start? Is it total refusal or reduced intake?
• Amount and type: what and how much did the cat eat in the last 24–72 hours? Any treats? Wet vs dry food?
• Vomiting/diarrhea: frequency, appearance, timing relative to meals.
• Drinking and urination: any change in thirst or litter box habits?
• Weight and body condition: recent weight loss or whether the cat is overweight (risk factor for hepatic lipidosis).
• Other signs: lethargy, hiding, breathing changes, coughing, coughing up blood, drooling, pawing at mouth.
• Recent events: new foods, medications, vaccinations, toxins, household changes, stressed episodes.
• Dental history: home dental care, bad breath, difficulty chewing.
• Medications or recent treatments: including supplements and household toxins exposure.
• Photos or video: short clips of behavior, vomiting or how the cat responds to food can be very helpful.

Initial Home Steps (short-term, while contacting your vet)

Do not attempt long‑term home treatment without veterinary guidance. Short-term measures you can try immediately:

• Offer warm, aromatic wet food or strong-smelling options (warmed helps aroma). Avoid excessive tuna or human foods long‑term.
• Offer small portions frequently, hand‑feeding or placing food where the cat prefers to eat.
• Minimize stress: quiet room, remove other pets during feeding, unchanged bowls/locations.
• Check the food for spoilage or contamination.
• Avoid overuse of over‑the‑counter appetite drugs or human medications — these can be harmful.

Next Steps — Veterinary Evaluation and Treatment Plan

(Refer to veterinary internal medicine sources and behavior guidance for specifics.)

Appetite Stimulants — What Owners Should Know

Appetite stimulants can be useful but are not a substitute for diagnosing the underlying problem. Commonly used drugs in cats include mirtazapine (available in oral tablets and transdermal cream) and sometimes cyproheptadine. Vets may also treat nausea with antiemetics (maropitant, ondansetron) to make the cat feel well enough to eat. All of these drugs should be prescribed and dosed by your veterinarian; they have contraindications and side effects.

Important notes:

• Appetite stimulants help in the short term but do not treat the cause of anorexia.
• Some stimulants can interact with other medications or are unsafe in certain conditions.
• Use of appetite stimulants without addressing nausea or pain may fail if the cat feels sick or painful.

Red Flags — Seek Emergency Care Now

Bring your cat to an emergency clinic immediately if you observe any of the following:

• Refusal to eat for 48 hours or more (or 24 hours for kittens or very ill cats).
• Rapid deterioration, collapsing, difficulty breathing, seizures.
• Repeated, severe vomiting or blood in vomit or stool.
• Jaundice (yellow gums/eyes), very pale gums, or signs of shock.
• Severe dehydration, inability to stand, or severe pain.
• Overweight cat that has stopped eating (high risk for hepatic lipidosis).

Key Takeaways

• Loss of appetite in cats is a medical red flag: contact your veterinarian early. Don’t assume it’s “just picky” food.
• The 24–48 hour rule: call your vet at 24 hours of anorexia; if your cat hasn’t eaten by 48 hours (especially if overweight), seek immediate care due to the risk of hepatic lipidosis.
• Causes include dental disease, GI problems, kidney and liver disease, infections, pain, toxins, and stress or food aversion.
• Observe and document duration, what and how much the cat ate, vomiting, water intake, and other signs — provide this to your vet.
• Treatment may involve diagnostics, fluid therapy, antiemetics, appetite stimulants prescribed by a vet, and nutritional support (including feeding tubes if needed).

References and Further Reading

• Merck Veterinary Manual: Feline Anorexia and Hepatic Lipidosis. https://www.merckvetmanual.com
• American Veterinary Society of Animal Behavior (AVSAB): Feline Environmental Needs and Stress Guidance. https://avsab.org
• Horwitz, D. & Neilson, J. (Veterinary behavior texts and internal medicine references)

Frequently Asked Questions