Why Won't My Cat Eat? Causes, Home Remedies & When to See a Vet

 

 

You bought expensive wet food, the dry food your friend recommended, the prescription diet the vet advised you to go on and every treat under the sun and your little one still turns their nose up at the food! I've been there time and time again with clients. A cat that won't eat is one of the most common and worrying things a cat owner can experience. Cats are notorious for being specific about what they like when it comes to food, so it can be genuinely hard to tell whether your cat is simply being picky or whether something is medically wrong.

The key thing to understand is this: Cats cannot safely go without food for extended periods. Hepatic lipidosis (fatty liver disease) can develop within 48–72 hours of not eating, particularly in overweight cats and not to mention cat's predisposition to triaditis (inflammation of their digestive tract). This makes anorexia (inappetence) in cats a more urgent concern than it might seem.

As a vet, I've seen cats stop eating for several different reasons. This guide covers as many as I could think of.

How Long Can a Cat Go Without Eating?

A healthy adult cat can survive without food for around 48 hours before the risk of serious complications particularly hepatic lipidosis begins to rise significantly. Kittens, elderly cats, and overweight cats are at risk sooner.

If your cat hasn't eaten for more than 24 hours, you should call your vet for advice. If it's been 48 hours or more, treat it as urgent.

Common Reasons a Cat Won't Eat

1. Stress or Anxiety

Stress is one of the most underestimated causes of appetite loss in cats. Cats are creatures of habit, and even subtle changes can affect their willingness to eat and their sensitivity to stress is something you'll hear me talk often about. Common triggers include: a new pet or baby in the home, moving house, having guests over, changes in your routine, building works, loud fireworks, keeping the hoover on for too long or rearrangement of furniture.

Stress-related anorexia is often accompanied by other behavioural changes: hiding, over-grooming, changes in litter tray use, or vocalisation. Identifying and keeping the source of stress to a minimum is the primary treatment.

2. Dental Pain

The reason I did my additional qualification in dentistry is not enough people are looking at their pet's mouth. Tooth resorption, gum disease (periodontal disease), tooth abscesses, and mouth ulcers are extremely common in cats and extremely painful. Tooth resorption, simple put is where the body eats away at the tooth leaving nerves exposed and can be incredibly painful. A cat with a sore mouth will often refuse dry food while still attempting soft food, or may drop food from their mouth mid-chew, paw at their face, or drool excessively.

Many cats suffer in silence with dental pain, and owners don't notice until the problem is severe. I'd recommend that any cat over the age of 3 should have an annual dental check as part of their health examination and if you're brushing your cat's teeth, you get a gold star from me!

3. Respiratory Infection

Cats rely heavily on their sense of smell to identify food. When an upper respiratory infection (cat flu) blocks their nose, food simply doesn't smell appetising. This is especially common in kittens due to them being immunocompromised in nature but also is why cats with flu need nursing support, gentle warming of food, sometimes syringe feeding and in some cases the vets can give medication to help with excessive mucus build up. Other signs of respiratory infection include sneezing, nasal discharge, watery eyes, and lethargy.

4. Nausea

A cat that feels nauseous won't eat just as a person with a bad stomach doesn't feel in the mood for food. Nausea in cats can be caused by kidney disease, liver disease, pancreatitis/triaditis, intestinal disease, medication side effects, or motion sickness. If your cat is also vomiting, drooling, swallowing repeatedly, or licking their lips a lot, nausea is the likely cause.

5. Kidney Disease

Chronic kidney disease is one of the most common illnesses in middle-aged and older cats, and reduced appetite is one of its earliest and most consistent signs. The build-up of waste products in the bloodstream makes affected cats feel persistently unwell and off their food. Other signs include weight loss, increased drinking and urination, and vomiting.

6. Hyperthyroidism

While hyperthyroidism more commonly causes increased appetite (combined with weight loss), some cats particularly in the later stages or if the thyroid is uncontrolled for a long period of time may become anorexic. The condition is common in cats over 10 years old and is easily diagnosed with a blood test and actually quite manageable once we've started their medication. The hardest part is the initial 4 weeks after diagnosis.

7. Gastrointestinal Problems

Conditions affecting the gut including IBD, pancreatitis, lymphoma, constipation, and intestinal obstruction all suppress the appetite. A cat that is also straining in the litter tray, has a distended abdomen, or is vomiting alongside not eating needs urgent veterinary assessment.

8. Pain

Any source of pain, a wound, arthritis, internal injury, or post-surgical discomfort can reduce a cat's appetite. Cats instinctively hide pain, so reduced eating may be the first sign an owner notices. If your cat has recently had an injury or operation, or if they seem reluctant to jump or move normally, pain may be the cause. Our guide on how to tell if your cat is in pain covers the subtle signs to watch for.

9. Food Preference and Neophobia

Some cats are just very particular about their food. A sudden switch in brand, flavour, or even the type of bowl you use can cause a cat to turn up its nose. Serving food cold from the refrigerator, a dirty bowl with strong smells, or food that's been left out too long can all put a cat off. I will always recommend washing the bowl regularly with non scented detergents and try to avoid plastic bowls.

If your cat is otherwise well playful, alert, normal litter tray use and this food refusal is new, try warming the food slightly, offering a different flavour, or trying a completely different texture (wet vs dry). Sometimes using the spring water from a tin of sardines or a little bit of olive oil or a little bit of chicken as a food topper also helps.

10. Recent Vaccination or Medication

It is common for cats to have a mildly reduced appetite for 24–48 hours following vaccination. Some medications, particularly antibiotics and anti-inflammatories, can also cause nausea and inappetence. It is really important not to give anti-inflammatories on an empty stomach. If you know your cat has recently received medication and their appetite loss is mild and short-lived, this is likely the cause. If it persists beyond 48 hours, call your vet.

Warning Signs: When Not Eating Becomes an Emergency

Seek immediate veterinary care if your cat:

• Has not eaten for more than 48 hours
• Is also vomiting repeatedly
• Is showing signs of jaundice yellow-tinged whites of the eyes or skin or gums
• Is lethargic, unresponsive, or collapsed
• Has a distended or painful abdomen
• Has recently ingested a potential toxin
• Is a kitten as they deteriorate much faster than adult cats

For more on recognising serious illness, read our guide on cat illness symptoms and when to act and normal cat body temperature.

How to Encourage a Cat to Eat

If your cat is otherwise well and has been off their food for less than 24 hours:

• Warm wet food slightly to enhance the aroma cats rely on smell
• Try a different food texture or flavour
• Make sure the bowl is clean and not near the litter tray
• Offer food in a quiet, calm area away from other pets
• Try hand-feeding or placing a small amount on your finger
• Add a small amount of chicken broth (make sure no onion or garlic) over kibble, you could also add spring water from tinned fish

Never starve a cat to force it to eat a new food, this risks hepatic lipidosis, especially in overweight cats. It's important to gradually wean them onto new food.

How Litter Sense Helps You Monitor the Early Signs

Some of the conditions most likely to cause appetite loss in cats kidney disease, UTIs, and urinary issues show up in the litter tray or urinating patterns before they show up on the food bowl. Litter Sense monitors your cat's urine with every use and can flag early changes, giving you the chance to act before appetite loss becomes serious.

To understand more about monitoring your cat's health, read our complete guide on how Litter Sense works.

Frequently Asked Questions

My cat hasn't eaten in 24 hours, what should I do?

Call your vet for advice. If your cat is otherwise well and this is completely out of character, monitor closely and try offering different foods. But do not wait longer than 48 hours without seeking veterinary guidance, as hepatic lipidosis can develop quickly.

Why is my cat not eating but drinking water?

A cat that is drinking more water than usual but not eating may have kidney disease, diabetes, or hyperthyroidism all of which cause increased thirst. This combination of symptoms needs a blood test and urine test to investigate. See your vet within 24 hours.

Why is my cat not eating but acting normal?

If your cat is alert, playful, and otherwise normal, the most likely causes are mild stress, a food preference issue, or a minor nausea trigger. Try warming their food, offering something different, and monitoring for 24 hours. If they still haven't eaten after 24 hours, call your vet.

Can stress stop a cat from eating?

Yes, absolutely. Stress is one of the leading causes of appetite loss in cats. Changes in routine, new animals, or environmental disruption can all suppress a cat's appetite. Identifying and reducing the stressor is key.

Should I syringe feed my cat?

Only under veterinary supervision. Syringe feeding done incorrectly can cause aspiration (food entering the lungs) and is highly stressful for the cat. If your cat genuinely cannot or will not eat, your vet may recommend appetite stimulants or assisted feeding via a feeding tube for short-term nutritional support.

What can I feed a sick cat that won't eat?

Plain, highly palatable foods, warmed wet food, plain boiled chicken (no seasoning), or a prescription diet from your vet are the best options. Strong-smelling foods are often more appealing to cats who are off their food.