Why Is My Cat Not Eating? 9 Possible Causes and When to Worry

Your cat has suddenly lost interest in food. From stress and dental pain to digestive problems and illness, here's what could be happening — and when to call the vet.

You put your cat's food down.

Normally, they're there before the bowl even touches the floor.

But today?

Nothing.

They sniff it, turn around and walk away.

Maybe they take one bite. Maybe they don't even come over.

And suddenly you're wondering:

Why is my cat not eating? Should I be worried?

Cats can lose their appetite for several reasons. Sometimes it's a change in routine or something about their food. Other times, it can be an early sign of a medical problem.

The important thing is that a cat refusing food shouldn't be ignored, even if they seem otherwise normal.

Here's what you need to know.

Why Is My Cat Not Eating? The Short Answer

Cats may stop eating because of stress, dental pain, nausea, digestive illness, infections, kidney disease, changes to their food or other medical conditions.

Some cats still approach their food bowl but struggle to eat. Others lose interest completely.

If your cat has stopped eating, contact your veterinarian promptly for advice. Don't wait several days to see whether they become hungry enough to eat.

A complete loss of appetite for around 24 hours is particularly concerning in an adult cat, and kittens, older cats and cats with existing health conditions may need help much sooner.

If your cat is also vomiting repeatedly, struggling to breathe, collapsing or showing severe pain, seek emergency veterinary care.

1. Dental Pain or Problems in Their Mouth

Imagine trying to eat dinner with a painful tooth.

Not particularly appealing, is it?

Cats can experience dental disease, tooth resorption, inflammation of the gums and other painful oral conditions.

Sometimes they still feel hungry but find eating uncomfortable.

Signs to look for:

• Approaching food but walking away.
• Dropping food from their mouth.
• Chewing unusually or favouring one side.
• Bad breath.
• Drooling.
• Pawing at their mouth.
• Preferring softer food.

Not every cat with dental pain shows obvious symptoms.

What should you do?

Book a veterinary appointment. Your vet can examine your cat's mouth and recommend appropriate treatment.

Don't attempt to examine a painful mouth forcefully or give human painkillers.

The Riley tip: Keep your cat's dental history and previous treatment records together. Dental problems can recur, and having that information accessible may help at future appointments.

2. Stress or Changes at Home

Cats can be surprisingly sensitive to changes in their environment.

A new pet. Visitors staying over. A house move. Even changes to where their food bowl is placed.

Some cats respond to stress by eating less.

You might also notice hiding, reduced interaction or changes in grooming.

What can help?

Provide a quiet, familiar feeding area away from busy spaces and other animals.

Maintain a predictable routine and make sure your cat can access food, water, litter trays and resting places comfortably.

But don't automatically assume stress is responsible.

A cat that stops eating still needs timely veterinary advice, particularly if the appetite loss continues or other symptoms appear.

3. Nausea or an Upset Stomach

Cats can feel nauseated without actually vomiting.

Sometimes they approach food, sniff it and turn away.

Other possible signs of nausea include:

• Lip licking.
• Drooling.
• Repeated swallowing.
• Vomiting.
• Reduced activity.
• Hiding.

Nausea can occur with many different illnesses, so it isn't a diagnosis in itself.

What should you do?

Contact your veterinarian if your cat is refusing food or showing signs of nausea.

Avoid giving over-the-counter stomach medications or attempting home treatments.

If your cat is repeatedly vomiting or cannot keep water down, seek urgent care.

4. A Change in Their Food

Cats can develop strong preferences about food.

Some are reluctant to eat when the flavour, texture or smell changes.

Even a change in the location of their feeding bowl may affect some cats.

But it's important not to mistake illness for fussiness.

What can help?

Check that the food is fresh, appropriate for your cat and being served in a clean bowl.

If you've recently changed their diet, let your veterinarian know.

Diet transitions are often best made gradually, but if your cat has stopped eating, don't delay seeking veterinary advice while experimenting with different foods.

The Riley tip: Record any recent diet changes alongside your cat's symptoms. These details may help your vet understand the timeline.

5. Kidney Disease

Kidney disease is an important cause of reduced appetite in cats, especially as they get older.

Cats with kidney disease may develop nausea and other symptoms that make eating less appealing.

You might also notice:

• Increased thirst.
• Increased urination.
• Weight loss.
• Vomiting.
• Reduced energy.
• Changes in coat condition.

Some cats show only subtle changes early on.

What should you do?

Your veterinarian may recommend blood tests, urine tests and other investigations.

Kidney disease can have several forms and stages, so treatment depends on the individual diagnosis.

6. Respiratory Infections

Cats rely heavily on their sense of smell when eating.

If their nose is congested, food may become less appealing.

Upper respiratory infections can also cause discomfort and general illness.

Possible signs include:

• Sneezing.
• Nasal discharge.
• Watery eyes.
• Congestion.
• Reduced appetite.
• Lethargy.

Some infections may also cause painful mouth ulcers.

What should you do?

Contact your veterinarian, especially if your cat is eating poorly.

Difficulty breathing, open-mouth breathing or marked distress requires emergency care.

7. Pain or Another Medical Condition

Cats are very good at hiding discomfort.

A cat experiencing pain may simply become quieter, hide more or stop eating.

Possible causes include injury, arthritis, abdominal pain or other illness.

Signs worth noticing:

• Reluctance to jump or climb.
• Hiding.
• Unusual posture.
• Reduced grooming.
• Irritability.
• Changes in movement.
• Difficulty settling.

What should you do?

Arrange a veterinary assessment.

Don't assume your cat is simply getting older or being difficult.

A change in appetite may be one of the few clues that something is wrong.

8. Digestive Disease or a Foreign Object

Conditions affecting the stomach or intestines can cause appetite loss.

These may include inflammation, constipation, pancreatitis and gastrointestinal obstruction.

Some cats also swallow objects such as string, ribbon or pieces of toys.

These can cause serious internal problems.

Warning signs include:

• Vomiting.
• Abdominal discomfort.
• Lethargy.
• Changes in bowel movements.
• Repeated retching.
• Refusing food.

What should you do?

If you suspect your cat has swallowed a foreign object, seek urgent veterinary care.

If string is visible coming from your cat's mouth or anus, never pull it.

9. Other Serious Illnesses

A loss of appetite can accompany many medical conditions.

These include liver disease, diabetes, infections, some cancers and other systemic illnesses.

This is why appetite loss alone cannot tell you what is wrong.

Your veterinarian may need to assess your cat's medical history, perform an examination and recommend tests.

The Riley tip: If your cat has an existing medical condition, keep their current medications and recent veterinary records readily available when seeking advice.

My Cat Is Not Eating but Is Drinking Water. Is That Serious?

Yes, it can be.

Drinking water doesn't mean your cat is receiving the nutrition they need.

Some cats continue drinking even when they're unwell.

Others may drink more because of an underlying condition.

If your cat has stopped eating but is still drinking, contact your veterinarian promptly.

Tell them whether your cat is drinking their usual amount or noticeably more or less than normal.

My Cat Is Not Eating but Acting Normal. Should I Worry?

This is one of the most common questions owners ask.

And it's understandable.

Your cat is walking around, looking out of the window and behaving as though nothing has changed.

Except they haven't eaten.

The problem is that cats can hide illness.

A cat may appear relatively normal despite having pain, nausea or another medical condition.

Don't wait for your cat to become visibly unwell before asking for veterinary advice.

If they've stopped eating, contact your veterinarian and explain when they last ate a normal meal.

My Cat Is Not Eating and Hiding. What Does That Mean?

Cats may hide when they're frightened, stressed, painful or ill.

When hiding happens alongside a loss of appetite, it's particularly important to consider a medical cause.

Don't force your cat out of their hiding place unless it's necessary for their safety or veterinary care.

Provide a calm environment and contact your veterinarian promptly.

If they're also weak, repeatedly vomiting or having difficulty breathing, seek emergency care.

My Cat Is Not Eating but Keeps Meowing. Why?

Increased vocalisation alongside appetite loss may occur for several reasons.

Your cat could be uncomfortable, stressed or experiencing another health problem.

Some cats appear hungry but struggle to eat because of dental pain or nausea.

The combination of symptoms isn't enough to identify a cause.

Arrange veterinary advice rather than assuming your cat is simply demanding different food.

For more information, read our Journal guide: Why Is My Cat Meowing So Much? 10 Possible Reasons and When to Worry.

How Long Can a Cat Go Without Food?

This is an important question — and one where waiting can be dangerous.

Cats should not be deliberately left without food to see whether they'll eventually eat.

A cat that isn't eating enough can develop serious complications.

One concern is hepatic lipidosis, sometimes called fatty liver disease.

This condition involves excessive fat accumulation in the liver and can occur when cats experience a period of inadequate food intake, particularly if they are overweight.

It can become life-threatening.

There is no single safe waiting period for every cat.

Kittens, diabetic cats, cats with existing illnesses and cats showing other symptoms may deteriorate more quickly.

Contact your veterinarian promptly when your cat stops eating. A complete loss of appetite approaching 24 hours in an adult cat warrants urgent assessment, and you should seek advice sooner if your cat is vulnerable or unwell.

What Can You Do at Home If Your Cat Won't Eat?

While arranging veterinary advice, there are a few sensible things you can try.

Offer Their Usual Food in a Quiet Place

Choose a familiar feeding area away from noise and interruptions.

Make sure other animals aren't preventing your cat from accessing the bowl.

Check That the Food Is Fresh

Some cats are reluctant to eat food that has been left out too long.

Offer an appropriate, fresh portion of their usual diet.

Try Gently Warming Wet Food

Slightly warming suitable wet food may make its smell more noticeable.

Make sure the food is not hot before serving.

Keep Fresh Water Available

Ensure your cat can access clean drinking water.

Avoid Force-Feeding

Don't force food or liquids into your cat's mouth without veterinary instructions.

Doing so can cause distress and may create a risk of aspiration.

Don't Give Human Medication

Never administer human painkillers, appetite stimulants or other medicines unless specifically prescribed by a veterinarian.

Remember: These measures aren't a substitute for medical assessment, and they shouldn't delay contacting your vet.

When Is a Cat Not Eating an Emergency?

Seek immediate veterinary care if your cat isn't eating and also has:

• Difficulty breathing.
• Collapse or severe weakness.
• Repeated vomiting.
• A swollen or painful abdomen.
• Suspected poisoning.
• A possible foreign-body obstruction.
• Severe pain or distress.
• Straining to urinate with little or no urine produced.

Young kittens and cats with diabetes or other serious medical conditions may need urgent assessment even before these signs appear.

If you're unsure how quickly your cat needs to be seen, call a veterinary service for advice.

What Will the Vet Do If Your Cat Isn't Eating?

Your veterinarian will usually start by asking about your cat's appetite and medical history.

They may want to know:

• When your cat last ate a normal meal.
• Whether they're eating anything at all.
• Whether they're drinking normally.
• Whether they've vomited.
• Whether their weight has changed.
• Whether they've been hiding or behaving differently.
• Whether they're taking medication.
• Whether they've had similar problems before.

Depending on the findings, your vet may recommend blood tests, urine tests, imaging or other investigations.

Treatment might include addressing pain or nausea, providing fluids, treating an underlying condition or giving nutritional support.

The approach depends on your cat's needs and diagnosis.

Why Tracking Your Cat's Appetite Matters

Here's something that's easy to overlook.

When you're worried about your cat, remembering the details can be surprisingly difficult.

Did they stop eating yesterday morning?

Have they been eating half their normal portion for a week?

Did something similar happen a few months ago?

Keeping a simple record can make veterinary conversations easier.

Try noting:

• The date appetite changes began.
• How much food your cat actually eats.
• Any vomiting or diarrhoea.
• Changes in drinking or urination.
• Weight changes, if known.
• Any new medications or diet changes.
• Previous veterinary diagnoses.

Even small details can help build a clearer picture.

How Riley Can Help You Stay on Top of Your Cat's Health

Cats can't tell us when something hurts.

And when their behaviour changes, it isn't always obvious what to do next.

That's one of the reasons we built Riley.

With Riley, you can keep your cat's medical records, medications and important veterinary information together in one place.

You can also use Ask Riley to explore general health questions informed by the history and documents you've saved about your pet.

That can make it easier to understand terminology, organise symptoms and prepare for conversations with your veterinarian.

Riley cannot diagnose the cause of appetite loss or replace veterinary care.

If your cat has stopped eating, contact your veterinarian promptly rather than relying on an app to assess the situation.

The Bottom Line

Sometimes cats stop eating because something in their environment has changed.

Sometimes it's dental pain, nausea or a digestive problem.

And sometimes it's a sign of a more serious illness.

Whatever the reason, a cat refusing food deserves attention.

Notice what's changed. Keep track of the symptoms. And don't wait too long to seek professional advice.

Because when it comes to your cat's health, even a small change in their usual routine can matter.

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