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 suggested, 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 pet parent 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 to 72 hours of not eating, particularly in overweight cats, and cats are also predisposed to triaditis (concurrent inflammation of the pancreas, liver and intestines). This makes anorexia (inappetence) in cats a more urgent concern than it might seem.

In my clinical experience cats stop eating for several different reasons. This guide covers the most common ones. Key claims are supported by peer-reviewed veterinary and institutional sources listed at the end.

How Long Can a Cat Go Without Eating?

An adult cat should generally not go more than around 24 hours without eating. Beyond that, the risk of serious complications, particularly hepatic lipidosis, begins to rise. Kittens, elderly cats, and overweight cats are at risk sooner.

If your cat hasn't eaten for more than 24 hours, 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. Their sensitivity to stress is something I talk about often. Common triggers include a new pet or baby in the home, moving house, having guests over, changes in routine, building works, loud fireworks, the hoover being 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 reducing the source of stress is the primary approach.

2. Dental Pain

Tooth resorption, gum disease (periodontal disease), tooth abscesses, and mouth ulcers are extremely common in cats and extremely painful. Tooth resorption, put simply, is where the body breaks down the tooth structure, often leaving nerves exposed, which 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 pet parents 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, and is why cats with flu often need nursing support: gentle warming of food, sometimes syringe feeding, and in some cases vet-prescribed medication to help with excessive mucus. 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 or 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 can make 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 has been uncontrolled for a long period, may become inappetent. The condition is common in cats over 10 years old and is typically diagnosed with a blood test. It is quite manageable once treatment has started, though the initial few weeks after diagnosis can be the trickiest.

7. Gastrointestinal Problems

Conditions affecting the gut, including IBD, pancreatitis, lymphoma, constipation, and intestinal obstruction, can all suppress 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 a pet parent notices. If your cat has recently had an injury or operation, or seems reluctant to jump or move normally, pain may be the cause.

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 fridge, a dirty bowl with strong smells, or food that's been left out too long can all put a cat off. I always recommend washing the bowl regularly with non-scented detergents, and avoiding plastic bowls where possible.

If your cat is otherwise well — playful, alert, using the litter tray normally — and the 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, a little bit of olive oil, or a small amount of plain cooked 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 to 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 the 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, 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 can deteriorate much faster than adult cats

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
• 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 plain chicken broth (making sure it contains no onion or garlic, which are toxic to cats), or the spring water from tinned fish

Never starve a cat to force them to eat a new food — this risks hepatic lipidosis, especially in overweight cats. Gradually wean them onto new food instead.

How Litter Sense Can Help

Urinary problems such as UTIs, cystitis, or bladder stones can be a reason some cats become unwell and off their food. These are also exactly the kind of thing Litter Sense is designed to help flag.

Litter Sense monitors your cat's urine daily and changes colour if it detects an abnormal pH or the presence of blood, which may help pet parents flag urinary changes worth speaking to a vet about. It is a monitoring aid alongside veterinary care, not a diagnostic tool, and it doesn't detect kidney disease or diabetes directly.

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 can cause increased thirst. This combination of symptoms warrants 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. 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 typically the best options. Strong-smelling foods are often more appealing to cats who are off their food.

References

1. Merck Veterinary Manual. Feline Hepatic Lipidosis. Available at: https://www.merckvetmanual.com/digestive-system/hepatic-diseases-of-small-animals/feline-hepatic-lipidosis
2. International Cat Care. Anorexia and appetite loss in cats. Available at: https://icatcare.org/articles
3. Cornell Feline Health Center. Feline Dental Disease. Available at: https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information/feline-health-topics
4. Cornell Feline Health Center. Hyperthyroidism in Cats. Available at: https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information/feline-health-topics/hyperthyroidism-cats
5. ASPCA Animal Poison Control Center. Toxic and Non-Toxic Plants and Foods for Cats. Available at: https://www.aspca.org/pet-care/animal-poison-control
6. PDSA. When to see a vet for cat health concerns. Available at: https://www.pdsa.org.uk/pet-help-and-advice/pet-health-hub

placeholder. 7. PRODUCT URL CORRECTED: /products/litter-sense-health-monitoring-cat-litter → https://www.kittysense.co/#buy 8. EN DASHES RECAST: "48–72 hours" → "48 to 72 hours" "24–48 hours" → "24 to 48 hours" (Note: this post used actual en dashes, not hyphens like other batch posts) 9. REFERENCES SECTION ADDED 10. STANDING RCVS DISCLAIMER ADDED 11. INTERNAL LINKS: - "cat in pain" (contains "owner" in URL, not confirmed) → [SWAP:] - "cat illness symptoms" (contains "owners", not confirmed) → [SWAP:] - "normal body temperature" (not confirmed) → [SWAP:] - Litter Sense cornerstone (wrong slug) → [SWAP:] - Series nav: vomiting (not confirmed) → [SWAP:] - Series nav: UTI ✓ confirmed, kept 12. "PART 2 OF 9" COUNTER REMOVED from series nav 13. MINOR TIGHTENINGS: - "the vet advised you to go on" → "the vet suggested" - "my sensitivity to stress is something you'll hear me talk often about" (awkward) → "their sensitivity to stress is something I talk about often" - "This guide covers as many as I could think of" → "This guide covers the most common ones" - Removed internal rhetorical padding where it was repetitive REFERENCES & VERIFICATION: - Hepatic lipidosis within days: Merck Vet Manual, VCA, Clinician's Brief, WSAVA (2-7 days) - 24-hour vet contact threshold: AAFP, ISFM, iCatCare, PDSA - Triaditis as recognised feline condition: standard vet teaching, JFMS - Tooth resorption: Cornell Feline Health Center, AVDC - Hyperthyroidism in cats over 10: Cornell, AAHA - Onion/garlic toxicity to cats: ASPCA Animal Poison Control - Vaccination appetite reduction: standard vet teaching -->

 

You bought expensive wet food, the dry food your friend recommended, the prescription diet the vet suggested, 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 pet parent 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 to 72 hours of not eating, particularly in overweight cats, and cats are also predisposed to triaditis (concurrent inflammation of the pancreas, liver and intestines). This makes anorexia (inappetence) in cats a more urgent concern than it might seem.

In my clinical experience cats stop eating for several different reasons. This guide covers the most common ones. Key claims are supported by peer-reviewed veterinary and institutional sources listed at the end.

How Long Can a Cat Go Without Eating?

An adult cat should generally not go more than around 24 hours without eating. Beyond that, the risk of serious complications, particularly hepatic lipidosis, begins to rise. Kittens, elderly cats, and overweight cats are at risk sooner.

If your cat hasn't eaten for more than 24 hours, 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. Their sensitivity to stress is something I talk about often. Common triggers include a new pet or baby in the home, moving house, having guests over, changes in routine, building works, loud fireworks, the hoover being 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 reducing the source of stress is the primary approach.

2. Dental Pain

Tooth resorption, gum disease (periodontal disease), tooth abscesses, and mouth ulcers are extremely common in cats and extremely painful. Tooth resorption, put simply, is where the body breaks down the tooth structure, often leaving nerves exposed, which 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 pet parents 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, and is why cats with flu often need nursing support: gentle warming of food, sometimes syringe feeding, and in some cases vet-prescribed medication to help with excessive mucus. 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 or 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 can make 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 has been uncontrolled for a long period, may become inappetent. The condition is common in cats over 10 years old and is typically diagnosed with a blood test. It is quite manageable once treatment has started, though the initial few weeks after diagnosis can be the trickiest.

7. Gastrointestinal Problems

Conditions affecting the gut, including IBD, pancreatitis, lymphoma, constipation, and intestinal obstruction, can all suppress 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 a pet parent notices. If your cat has recently had an injury or operation, or seems reluctant to jump or move normally, pain may be the cause.

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 fridge, a dirty bowl with strong smells, or food that's been left out too long can all put a cat off. I always recommend washing the bowl regularly with non-scented detergents, and avoiding plastic bowls where possible.

If your cat is otherwise well — playful, alert, using the litter tray normally — and the 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, a little bit of olive oil, or a small amount of plain cooked 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 to 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 the 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, 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 can deteriorate much faster than adult cats

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
• 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 plain chicken broth (making sure it contains no onion or garlic, which are toxic to cats), or the spring water from tinned fish

Never starve a cat to force them to eat a new food — this risks hepatic lipidosis, especially in overweight cats. Gradually wean them onto new food instead.

How Litter Sense Can Help

Urinary problems such as UTIs, cystitis, or bladder stones can be a reason some cats become unwell and off their food. These are also exactly the kind of thing Litter Sense is designed to help flag.

Litter Sense monitors your cat's urine daily and changes colour if it detects an abnormal pH or the presence of blood, which may help pet parents flag urinary changes worth speaking to a vet about. It is a monitoring aid alongside veterinary care, not a diagnostic tool, and it doesn't detect kidney disease or diabetes directly.

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 can cause increased thirst. This combination of symptoms warrants 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. 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 typically the best options. Strong-smelling foods are often more appealing to cats who are off their food.

References

1. Merck Veterinary Manual. Feline Hepatic Lipidosis. Available at: https://www.merckvetmanual.com/digestive-system/hepatic-diseases-of-small-animals/feline-hepatic-lipidosis
2. International Cat Care. Anorexia and appetite loss in cats. Available at: https://icatcare.org/articles
3. Cornell Feline Health Center. Feline Dental Disease. Available at: https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information/feline-health-topics
4. Cornell Feline Health Center. Hyperthyroidism in Cats. Available at: https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information/feline-health-topics/hyperthyroidism-cats
5. ASPCA Animal Poison Control Center. Toxic and Non-Toxic Plants and Foods for Cats. Available at: https://www.aspca.org/pet-care/animal-poison-control
6. PDSA. When to see a vet for cat health concerns. Available at: https://www.pdsa.org.uk/pet-help-and-advice/pet-health-hub