My cat has stopped eating — symptom guide

A clear, step-by-step guide for owners whose cat has stopped eating: what to check at home, common causes, when it's urgent, and how vets will evaluate the problem.

Quick Assessment

• Is this an emergency?

• Most common immediate causes: stress/diet change, dental/oral pain, mild gastrointestinal upset (nausea), upper respiratory infection.
• When to see a vet: any refusal to eat that lasts more than 24 hours, sooner with vomiting, weakness, jaundice, or if your cat is a senior, obese, or has underlying disease (kidney, diabetes, heart).

What “not eating” looks like

Not eating (anorexia) in cats ranges from skipping one meal to refusing all food and treats. Owners may notice:

• Leaving food untouched for 12–24 hours.
• Sniffing but not eating, or chewing then not swallowing.
• Only eating treats or certain textures (e.g., dry kibble but not wet food).
• Reduced interest in favorite foods or hunger cues (no begging, no meowing for food).
• Weight loss, decreased grooming, hiding.

Why this is more urgent in cats than in dogs

Cats handle fasting poorly. If a cat stops eating for more than about 48 hours, fat from the body is mobilized and the liver can become overwhelmed, leading to hepatic lipidosis (fatty liver disease). Hepatic lipidosis can rapidly become life‑threatening and requires hospitalization and assisted feeding. For this reason, appetite loss in cats is treated urgently.

Sources: Merck Veterinary Manual — Hepatic Lipidosis.

Common and less common causes (ranked by likelihood)

Less common causes: autoimmune disease, neurological disease affecting appetite, cancer.

Decision tree: quick-action guide

• If not eating + nasal discharge/sneezing → likely upper respiratory infection → isolate, keep nose clear, call vet; if breathing difficulty → emergency.

• If not eating + drooling, pawing at mouth, bad breath → likely dental/oral disease → gently examine mouth for obvious swelling/bleeding; call vet for dental exam and pain control.

• If not eating + repeated vomiting or abdominal pain → likely GI obstruction, pancreatitis or severe gastritis → emergency vet evaluation.

• If not eating + increased thirst/urination, vomiting, lethargy → likely kidney disease or diabetes → schedule veterinary appointment today for bloodwork and urinalysis.

• If not eating >24 hours with weight loss or lethargy → call your vet for early evaluation and to discuss appetite stimulants or assisted feeding; do not wait to reach 48 hours.

• If not eating >48 hours or showing jaundice, severe weakness, or dehydration → emergency; go to an emergency clinic for immediate care (fluids, diagnostics, likely hospital care and assisted feeding).

Home assessment: what to check and measure

Do these checks calmly and record findings to report to the vet:

• Duration: exactly how long since your cat last ate? (hours)
• Amount eaten: none at all, small amounts, only treats?
• Vomiting/diarrhea: frequency, appearance (blood, bile), timing in relation to meals.
• Drinking: normal, increased, or decreased? Note urine output if possible.
• Activity and alertness: normal, quiet, hiding, weak, wobbly.
• Temperature: normal cat temp is 100.5–102.5°F (38.1–39.2°C). Fever >103°F (39.4°C) is concerning; >104°F (40°C) is an emergency.
• Weight: any recent loss; how much and over what time?
• Hydration: check gums (normally pink and moist), skin tent (gently lift skin over shoulders — returns immediately in well‑hydrated cat). Dehydration estimates: 5% mild, 6–8% moderate, >10% severe (may show tacky gums, sunken eyes, weakness).
• Mouth check: any broken teeth, ulcers, excessive drooling, bad smell, swelling (only if your cat tolerates handling safely).
• Recent changes: new food/treats, recently boarded, new household pets, medications, access to toxins, recent surgery.

When It's an Emergency — red flags (go to ER now)

• Not eating for >48 hours (risk of hepatic lipidosis)
• Severe lethargy, collapse, inability to stand
• Repeated, uncontrolled vomiting or visible blood in vomit or stool
• Yellow gums, skin, or whites of the eyes (jaundice)
• Difficult or rapid breathing
• Seizures or neurologic signs
• Severe dehydration (sunken eyes, tacky/pale gums, weakness) or inability to drink
• Signs of abdominal pain (hissing when touched, hunched posture), markedly distended abdomen

When to schedule a vet visit (non‑emergency but urgent)

• No food for 24 hours in an otherwise stable cat
• Mild vomiting (one or two episodes) with decreased appetite
• Noticeable weight loss over days to weeks
• Older cats or cats with known chronic disease who eat less
• Any mouth pain, drooling, or bad breath

Home care while monitoring (safe actions)

• Try palatable options: warmed wet food or low-sodium tuna juice (small amounts), strong-smelling foods (rotate different brands/textures). Warming increases aroma and may entice eating.
• Reduce stress: quiet room, familiar bedding, separate from other pets, same food bowl your cat prefers.
• Offer small frequent meals rather than one large meal.
• Keep fresh water accessible. Encourage drinking; consider a shallow bowl if your cat prefers that.
• Do not give over‑the‑counter human medicines. Never give NSAIDs or acetaminophen — these are dangerous to cats.
• If your cat will accept it, offer a veterinary recovery formula (e.g., prescription recovery diets or critical care liquid) — only if your veterinarian approves or instructs. Syringe feeding should be done under veterinary guidance because of aspiration risk.
• If your cat has not eaten for 24 hours, call your vet to discuss appetite stimulants, anti‑nausea medication, or early assisted feeding plans. If fasting continues, timely placement of a feeding tube in clinic may be recommended to prevent hepatic lipidosis.

Appetite stimulants and supportive medications (overview)

A veterinarian may prescribe or administer medications to improve appetite or control nausea. Common options your vet may consider:

• Anti‑nausea/antiemetics: maropitant (Cerenia), ondansetron or metoclopramide — to control vomiting and nausea so the cat will eat.
• Appetite stimulants: mirtazapine (oral or transdermal), cyproheptadine (less common). These require veterinary dosing and monitoring.
• Nutritional support: prescription recovery diets, syringe feeding, or placement of an esophagostomy or gastrostomy feeding tube if assisted feeding is needed.
• Fluids: subcutaneous or intravenous fluids for dehydration and to support kidney/liver perfusion.

What to tell your vet (prepare this information)

Be ready to communicate:

• Exact time and duration since last eaten and what (brand/texture) was offered
• Vomiting or diarrhea: how many episodes and appearance
• Water intake and urine output changes
• Recent weight (or estimate) and any recent weight loss
• Complete list of medications, supplements, and recent vaccines
• Any possible toxin exposures (plants, cleaners, human meds, rodent bait)
• Recent stressors or changes at home
• Previous medical problems (kidney disease, diabetes, liver disease, dental issues)
• Behavior changes (hiding, aggression, drooling, difficulty grooming)

Diagnostics your vet may use

• Physical exam and oral exam (likely under sedation if painful)
• Bloodwork: CBC, chemistry panel (kidney values, liver enzymes, bilirubin, bile acids), electrolytes
• Urinalysis and urine culture if indicated
• Abdominal X‑rays or ultrasound to look for obstruction or pancreatitis
• Specific tests: T4 (thyroid), pancreatic lipase (fPLI), FIV/FeLV testing, blood pressure
• If hepatic lipidosis is suspected, bile acids and imaging, sometimes liver biopsy

Final notes — when in doubt, act early

Because cats rapidly develop serious complications from even short periods of not eating, you should treat any significant appetite loss as urgent. Call your veterinarian if your cat refuses food for a full day, and go to emergency care immediately for the red‑flag signs listed above. Early veterinary assessment and treatment (fluids, anti‑nausea meds, appetite stimulants, and if needed, assisted feeding) dramatically improve outcomes.

Primary references: Merck Veterinary Manual (Hepatic lipidosis; Anorexia in cats), AAFP/Cornell Feline Health Center resources.

Frequently Asked Questions