Why Is My Cat Not Eating?
A cat that refuses food for more than 24 to 48 hours is a concern that should be taken seriously. Unlike dogs, cats cannot safely fast for extended periods. Within 24 to 48 hours of not eating, cats begin mobilising fat reserves, and within 3 to 5 days this can progress to hepatic lipidosis (fatty liver disease), a potentially life-threatening condition. Loss of appetite in cats is not something to take a wait-and-see approach with beyond a short window.
Common Causes of Loss of Appetite in Cats
Nausea and gut discomfort. A cat that feels nauseous avoids food instinctively. Gut microbiome disruption, gastroenteritis, hairballs causing obstruction, and any condition producing gut pain or discomfort will suppress appetite. The cat isn't being fussy: it genuinely feels unwell and food is the last thing it wants.
Stress and anxiety. Stress is one of the most common causes of appetite loss in cats. Changes in the household, new animals, moving, or conflict with other cats can produce immediate appetite suppression. This is particularly common in multi-cat households where a less dominant cat is being prevented from reaching the food bowl by a more dominant animal.
Dental pain. Dental disease is extremely common in cats and is an underdiagnosed cause of reduced appetite. A cat eating less, eating on one side of the mouth, dropping food, or showing reluctance around hard food may have significant dental pain.
Respiratory infection. Upper respiratory infections reduce a cat's ability to smell food, and since smell is a primary driver of feline appetite, a blocked nose can produce significant appetite loss.
Systemic illness. Kidney disease, hyperthyroidism, liver disease, and many other systemic conditions produce appetite loss. Any cat with appetite loss combined with other symptoms like increased thirst, weight loss, or lethargy needs a vet visit.
Recent vaccination or medication. Appetite suppression is a common short-term side effect of vaccinations and some medications. Usually resolves within 24 to 48 hours.
Food aversion. If a cat has vomited after eating a particular food, it may develop a strong aversion to that food. This is a survival mechanism that can make re-introducing even a favourite food difficult if it was present during a nausea episode.
When to See a Vet
If your cat has not eaten for more than 24 hours, or has significantly reduced intake for more than 48 hours, contact your vet. Act sooner if the appetite loss is accompanied by vomiting, diarrhoea, lethargy, weight loss, or other symptoms. Don't wait more than a day or two given the hepatic lipidosis risk.
Gut Health Support for Cats with Reduced Appetite
Where reduced appetite is linked to gut discomfort, nausea, or gut microbiome disruption, probiotic and postbiotic supplementation helps address the underlying gut instability. The liquid format is particularly valuable here as it can be added to even a very small amount of food when appetite is minimal.
Tummy Time Liquid Probiotics for Dogs and Cats (500ml)
Pour a small amount over whatever the cat is willing to eat. Consistent delivery of probiotic and Zoonatant postbiotic support even in reduced quantities helps maintain gut health during periods of low appetite and supports faster restoration of normal eating patterns as the underlying cause resolves.
Shop Tummy Time Liquid Probiotics
Frequently Asked Questions
How long can a cat go without eating?
Adult cats should not go without food for more than 24 to 48 hours without veterinary assessment. Beyond 2 to 3 days without eating, the risk of hepatic lipidosis becomes significant. Kittens, senior cats, and overweight cats are at higher risk and should be seen sooner.
My cat isn't eating but is drinking. Should I be worried?
Yes. Eating with no appetite plus maintaining water intake can indicate nausea, or the early stages of several systemic conditions. A vet visit within 24 hours is appropriate.
Can stress stop a cat eating?
Yes, very effectively. Stress is one of the most powerful appetite suppressants in cats. If your cat has stopped eating following a household change, a new animal, or any environmental disruption, stress is a likely contributor alongside any physical cause that should be ruled out.
My cat is eating less than usual but not completely refusing food. Should I worry?
A gradual or partial reduction in appetite over days warrants monitoring. If it continues or is accompanied by weight loss, it deserves a vet visit. Subtle appetite changes are sometimes early indicators of developing health conditions that are easier to manage when caught early.