Why a Cat Not Eating Is Never Something to Ignore
Unlike dogs, cats cannot safely go without food for extended periods. While a dog may fast for a day or two without serious consequence, a cat that stops eating — even for 48 to 72 hours — risks developing hepatic lipidosis, a potentially fatal liver condition. This makes feline anorexia (the medical term for loss of appetite) a more urgent concern in cats than in most other companion animals.
A reduced or absent appetite is not a diagnosis in itself — it is a symptom of something else. The causes range from entirely benign (a cat that simply dislikes a new food flavour) to life-threatening (severe systemic illness). Your job is to identify which category applies, and to act promptly if there is any doubt.
Common Causes of Cats Not Eating (Most to Least Frequent)
1. Stress and Environmental Change
Cats are creatures of habit and are deeply sensitive to changes in their environment. Moving home, the arrival of a new pet or baby, building work nearby, a change in routine, or even rearranging furniture can cause a cat to stop eating temporarily. This type of anorexia is usually short-lived and resolves once the cat settles. Providing hiding places, maintaining predictable feeding times, and using feline pheromone diffusers (such as Feliway, available at Zooplus and major pet retailers) can help. If the stress is prolonged, consult your vet.
2. Food Aversion or Preference
Cats are famously selective eaters. A change in food brand, flavour, texture, or temperature may be enough for some cats to refuse a meal entirely. Some cats will reject food that has been refrigerated (they prefer it at room temperature or slightly warmed). Contaminated, stale, or spoiled food will also be refused — always check that food is within its use-by date and stored correctly. Gradual food transitions are far more successful than abrupt changes.
3. Dental Pain and Oral Disease
Dental disease is extraordinarily common in cats — studies suggest that the majority of cats over three years of age have some degree of periodontal disease, tooth resorption, or gingivitis. Oral pain makes eating uncomfortable or impossible. Signs that dental pain is the cause include pawing at the mouth, dropping food, excessive drooling, chewing on one side only, or a visible reluctance to approach the food bowl. A veterinary dental examination — and often a dental procedure under anaesthesia — is necessary to resolve this.
4. Upper Respiratory Infection
Cats rely heavily on their sense of smell to identify and enjoy food. A respiratory infection causing nasal congestion — such as feline herpesvirus or calicivirus, both common in European cat populations — renders food unappealing simply because the cat cannot smell it. These infections also cause lethargy, sneezing, and eye discharge. Most cats resume eating once nasal congestion clears, but supportive veterinary care (including appetite stimulants in some cases) may be needed.
5. Nausea and Gastrointestinal Illness
Any condition causing nausea will suppress appetite. Gastroenteritis, inflammatory bowel disease (IBD), pancreatitis, and intestinal obstruction are all common culprits. A cat that is vomiting alongside not eating requires prompt veterinary attention. Intestinal parasites — particularly relevant in cats that hunt, as highlighted in ESCCAP guidelines — can also suppress appetite, especially in kittens with heavy burdens.
6. Medication Side Effects
Many medications used in cats cause nausea or reduce appetite as a side effect. If your cat has recently started a new medication and has subsequently stopped eating, contact your vet. Do not stop medication without guidance, but your vet may be able to offer anti-nausea support or adjust the treatment.
7. Kidney Disease
Chronic Kidney Disease Early Signs">Kidney Disease in Cats: Diet, Symptoms & Prognosis">Kidney Disease Diet">Kidney Disease in Dogs: Diet, Supplements & Quality of Life">kidney disease (CKD) is one of the most prevalent conditions in older cats and is a very common cause of reduced appetite. Toxin accumulation causes nausea and a general feeling of illness. Cats with CKD typically also show increased thirst and urination, weight loss, and poor coat condition. Blood and urine tests confirm the diagnosis, and dietary management is a cornerstone of treatment.
8. Hyperthyroidism (Paradoxically)
While hyperthyroidism typically causes increased appetite, some hyperthyroid cats develop gastrointestinal complications — including vomiting, IBD, and nausea — that ultimately suppress eating. Any older cat that has lost weight and is not eating should have thyroid levels checked as part of the initial blood screen.
9. Serious Systemic Illness
Cancer, heart disease, immune-mediated conditions, and severe infection all suppress appetite as part of the body's response to illness. Prolonged anorexia in the context of other symptoms — lethargy, weight loss, jaundice, or respiratory distress — requires urgent investigation.
The Danger of Hepatic Lipidosis
This deserves special emphasis. When a cat stops eating, the body begins to mobilise fat reserves for energy. In cats, this process is poorly regulated compared to other species, and fat floods the liver faster than it can be processed. The result is hepatic lipidosis — fatty liver disease — which causes progressive liver failure. Hepatic lipidosis can develop within 48 to 72 hours of anorexia in susceptible cats, particularly those that are overweight.
Signs of developing hepatic lipidosis include profound lethargy, vomiting, drooling, jaundice (yellowing of the eyes, gums, or skin), and weakness. Treatment requires hospitalisation, aggressive nutritional support (often via a feeding tube), and management of the underlying cause. Recovery is possible but requires rapid intervention. This is why even two to three days without eating in a cat must be taken seriously — do not wait and see.
Red Flags: When Not Eating Is an Emergency
- Not eating for more than 48 hours
- Not eating combined with vomiting, diarrhoea, or lethargy
- Yellow-tinged eyes, gums, or skin (jaundice — possible liver failure)
- Drooling, weakness, or difficulty swallowing
- Known or suspected ingestion of a toxin
- Kittens or cats with known health conditions refusing food
- Rapid or significant weight loss
Home Tips for Encouraging a Cat to Eat
If your cat has missed one or two meals but is otherwise alert and well, try the following before calling the vet:
- Warm the food gently to just below body temperature to enhance aroma
- Try a different texture — some cats prefer pâté over chunks, or vice versa
- Offer a small amount of a highly palatable food (e.g. plain cooked chicken or tuna) to stimulate interest
- Ensure the food bowl is clean and positioned away from the litter tray
- Reduce any obvious sources of stress in the home environment
- Try feeding from your hand or a flat plate if your cat dislikes deep bowls (which can press on their whiskers)
See Your Vet If…
- Your cat has not eaten for 48 hours or more
- You notice any other symptoms alongside not eating
- Your cat is losing weight
- Your cat is a kitten, a senior, or has a known health condition
- Home encouragement strategies have not worked within 24 hours
- You notice any yellow tinge to the eyes, gums, or skin
With feline anorexia, the cost of waiting too long is far higher than the cost of a prompt vet visit. When in doubt, call your vet early.