Why Is My Cat Not Eating?
A cat that stops eating for more than 24–48 hours needs veterinary attention. Here are the 11 most common causes, how long is too long, and when it becomes an emergency.
Cats are unique among domestic animals in how dangerous it is for them to stop eating. A cat that goes without food for more than 48–72 hours is at serious risk of developing hepatic lipidosis (fatty liver disease) — a potentially fatal condition where the liver becomes overwhelmed by the body mobilizing fat reserves for energy. This makes a cat that has stopped eating a more urgent situation than most owners realize. This guide explains the most common causes and gives you clear guidance on when to act.
🚨 This Is an Emergency — Go to Your Vet Now If:
- •Your cat has not eaten anything for 48 hours or more
- •Your cat is vomiting repeatedly or cannot keep water down
- •Your cat has yellow-tinged skin, gums, or whites of the eyes (jaundice)
- •Your cat is visibly weak, unsteady, or unable to stand
- •Your cat is drooling excessively or pawing at their mouth
- •Your cat has not urinated in 24+ hours (especially in male cats — may indicate blockage)
- •Your cat has a known medical condition and stops eating
The Fatty Liver Risk — Why Cats Cannot Skip Meals
When cats stop eating, their bodies mobilize fat stores for energy. Unlike most animals, cats' livers are not well-equipped to process large amounts of fat — causing fat to accumulate in liver cells, leading to hepatic lipidosis (fatty liver disease). This can develop in as little as 48–72 hours, particularly in overweight cats, and can be fatal if untreated. This is why a cat that has stopped eating is always considered a medical concern regardless of the apparent reason.
11 Common Causes of Appetite Loss in Cats
These causes cover the most common reasons cats stop eating. Any cause that persists beyond 24 hours warrants veterinary attention.
Dental Pain & Oral Disease
High priorityDental disease is the most common cause of appetite loss in cats. Tooth resorption (a painful condition unique to cats where the tooth structure dissolves from within), gum disease, abscesses, and oral ulcers all cause significant pain when eating. Cats are stoic and rarely show obvious signs of mouth pain — eating less or stopping is often the only sign.
Symptoms:
Eating less, dropping food, chewing on one side, pawing at mouth, drooling, bad breath, preferring soft food.
Action:
Oral examination under sedation by your vet. Professional dental treatment.
Stress & Environmental Change
MonitorCats are highly sensitive to changes in their environment. A new home, new pet, new person, change in routine, building work, or even rearranged furniture can cause stress-related appetite loss. This is one of the more common causes in younger cats. However, medical causes must always be excluded before attributing appetite loss to stress.
Symptoms:
Hiding, reduced grooming or over-grooming, changes in litter box habits, clinginess or avoidance, reduced play.
Action:
Identify and minimize the stressor. Feliway diffuser (synthetic feline pheromone) can help. If no improvement within 24–48 hours, see your vet.
Upper Respiratory Infection
MonitorCats rely heavily on scent to stimulate appetite. Upper respiratory infections (cat flu) block nasal passages, eliminating the sense of smell and dramatically reducing appetite. This is particularly common in kittens and cats in multi-cat households or shelters.
Symptoms:
Sneezing, nasal discharge, eye discharge, lethargy, open-mouth breathing in severe cases.
Action:
Veterinary assessment, antiviral or antibiotic treatment if bacterial secondary infection, supportive care including appetite stimulants.
Kidney Disease (CKD)
CriticalChronic kidney disease is extremely common in older cats and one of the most frequent causes of appetite loss in cats over 7 years old. Toxin buildup (uremia) causes nausea and suppressed appetite. Cats with CKD often stop eating during acute flare-ups — this is always an emergency requiring prompt veterinary management.
Symptoms:
Increased thirst and urination, weight loss, vomiting, bad breath (ammonia odor), lethargy, mouth ulcers, hiding.
Action:
Blood and urine tests, IV fluid therapy for dehydration, nausea medication, kidney diet. Annual kidney panels from age 7.
Hyperthyroidism
High priorityHyperthyroidism is very common in older cats (typically over 10 years). While it usually causes increased appetite and weight loss, some hyperthyroid cats develop concurrent gastrointestinal disease or nausea that suppresses appetite. Any older cat that stops eating should have thyroid levels checked.
Symptoms:
Weight loss despite normal or increased appetite (usually), vomiting, hyperactivity, increased thirst, poor coat quality, heart murmur.
Action:
Thyroid blood panel. Treatment options include medication, radioactive iodine therapy, or surgical removal.
Gastrointestinal Disease
High priorityConditions including IBD (inflammatory bowel disease), pancreatitis, intestinal lymphoma, and constipation all cause nausea and appetite suppression. IBD and lymphoma are often difficult to distinguish without biopsy — both are common in middle-aged to older cats and cause chronic appetite fluctuation and weight loss.
Symptoms:
Vomiting (may be intermittent and chronic), diarrhea or constipation, weight loss, hunched posture, abdominal sensitivity.
Action:
Bloodwork, ultrasound, and possibly endoscopy or biopsy for definitive diagnosis. Treatment varies by condition.
Cancer
CriticalCancer is a common cause of appetite loss in older cats. Lymphoma (the most common feline cancer), liver tumors, gastrointestinal tumors, and oral tumors can all suppress appetite through metabolic effects, nausea, pain, or physical obstruction. Weight loss combined with appetite loss in an older cat always warrants thorough investigation.
Symptoms:
Weight loss, lethargy, vomiting, diarrhea, visible or palpable lumps, jaundice, abdominal swelling.
Action:
Full physical examination, bloodwork, chest X-ray, abdominal ultrasound. Biopsy for definitive diagnosis.
Food Aversion or Preference Change
Low riskCats can develop strong aversions to foods associated with nausea or illness — a phenomenon called conditioned taste aversion. If a cat was nauseous while eating a particular food, they may refuse it permanently even after recovery. Frequent food changes can also cause cats to become finicky, holding out for preferred foods.
Symptoms:
Refuses specific food but accepts others, approaches bowl then walks away, increased vocalization around feeding time.
Action:
Offer a different food. Warm food slightly to enhance aroma. If the cat is eating some food, monitor closely. If refusing all food for 48+ hours, see your vet.
Medication Side Effects
MonitorMany medications can suppress appetite in cats including antibiotics (particularly metronidazole and clindamycin), chemotherapy drugs, and some pain medications. If appetite loss coincides with starting a new medication, contact your vet — do not stop medication without guidance.
Symptoms:
Appetite loss beginning shortly after starting new medication, may be accompanied by nausea or lethargy.
Action:
Contact your vet. Do not stop prescribed medication without guidance. Anti-nausea medication or appetite stimulants may be prescribed.
Fever or Systemic Infection
High priorityAny infection, inflammatory condition, or fever will suppress appetite in cats. Bacterial infections, viral infections (FIV, FeLV), and abscesses (common in outdoor cats from bite wounds) all cause systemic illness and appetite loss.
Symptoms:
Lethargy, warmth to touch, hiding, reduced grooming, possible localized swelling or wound.
Action:
Veterinary examination and temperature check. Antibiotics if bacterial cause identified. FIV/FeLV testing if not previously done.
Obstruction or Foreign Body
CriticalCats that ingest string, thread, hair ties, or other foreign material can develop gastrointestinal obstruction — a life-threatening emergency. Linear foreign bodies (string, thread) are particularly dangerous as they can bunch the intestines. Any cat that suddenly stops eating and has signs of abdominal pain requires immediate veterinary attention.
Symptoms:
Sudden appetite loss, retching or vomiting without producing anything, abdominal pain (hunched posture, sensitivity to touch), lethargy.
Action:
Emergency veterinary care. Do not wait. Do not attempt to pull any visible string — this can cause severe internal damage.
How Long Is Too Long?
Monitor closely. Offer different foods. Check for obvious causes (new stress, new food). If the cat is otherwise behaving normally, watch for another 12–24 hours.
Call your vet and describe symptoms. Most vets will recommend an appointment within this timeframe. Begin warming food to enhance aroma.
See your vet the same day. Risk of fatty liver disease increases significantly. Do not wait to see if the cat starts eating on its own.
Emergency — go to your vet or emergency animal clinic immediately. Hepatic lipidosis may already be developing.
Monitor Your Cat's Body Condition
If your cat has been unwell or has lost weight, PawScan's photo analysis gives you an instant body condition score to help track recovery between vet visits.
Scan your pet nowHow to Encourage a Cat to Eat
Warm the food
Warming wet food to body temperature (around 38°C / 100°F) significantly enhances aroma, which is the primary driver of appetite in cats. Do not microwave — heat on the stovetop or in warm water, and test temperature before serving.
Try a different food
Offer a different flavor, brand, or texture. Some cats will accept a new food when they refuse their usual one. Strongly aromatic foods like tuna, sardines, or chicken broth (low sodium, no onion or garlic) can stimulate appetite.
Hand feeding
Some cats will eat from your hand when they refuse a bowl. This can be useful for identifying whether the issue is the food or the location/bowl.
Change the feeding location
A stressed cat may refuse to eat in a location that feels unsafe. Try feeding in a quiet room away from other pets or activity.
Never force feed at home
Attempting to force food into a cat's mouth at home can cause aspiration, stress, and food aversion — making the problem worse. If a cat needs force-feeding, this should be done by a vet using a syringe or feeding tube.
Frequently Asked Questions
How long can a cat go without eating?▾
While cats can technically survive without food for 1–2 weeks if they have access to water, the risk of hepatic lipidosis (fatty liver disease) begins within 48–72 hours of not eating — especially in overweight cats. This makes appetite loss in cats a more urgent situation than in dogs. Never wait more than 48 hours before contacting your vet.
My cat is drinking water but not eating — is that okay?▾
A cat that is drinking but not eating still faces the risk of hepatic lipidosis if the situation continues beyond 48 hours. Drinking water is positive, but it does not prevent the liver complications of not eating. Contact your vet if your cat has not eaten for 24–48 hours.
Why do cats stop eating when stressed?▾
Cats are highly sensitive to environmental change. Their appetite is closely linked to their sense of security — a stressed cat may reduce or stop eating as a stress response. Common triggers include new pets, new people, moving home, building work, and changes in routine. However, always rule out medical causes before attributing appetite loss to stress alone.
Should I change my cat's food if they stop eating it?▾
If your cat suddenly refuses food they previously ate, the first priority is ruling out illness — not switching food. A cat that stops eating a food they previously accepted may have developed food aversion (associated with nausea while eating that food) or may be unwell. See your vet if the cat refuses all food for 24–48 hours.
What is hepatic lipidosis in cats?▾
Hepatic lipidosis (fatty liver disease) is a potentially life-threatening condition that develops when cats stop eating. The body mobilizes fat stores for energy, but cats' livers are not efficient at processing large amounts of fat — causing fat to accumulate in liver cells and impairing function. Overweight cats are at highest risk. It can develop within 48–72 hours of not eating and requires veterinary treatment including nutritional support via feeding tube in severe cases.
This article is for educational purposes only. Always consult a licensed veterinarian for medical advice specific to your pet.