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

A cat not eating can be reacting to something relatively simple, such as a change in food, stress, or an unfamiliar environment. But loss of appetite can also be an early sign of pain or illness.

Cats are especially vulnerable when they stop eating for an extended period, so a persistent loss of appetite should not be treated as normal or ignored for several days.

The important questions are: How much is your cat actually eating? How long has the change lasted? And are there any other symptoms?

This guide explains what may cause a cat to stop eating, what other signs to watch for, and when veterinary care is appropriate.

This article is for educational purposes only and does not replace an examination by a veterinarian. Loss of appetite has many possible causes, and only a veterinary professional can diagnose the underlying problem.

Is It Normal for a Cat to Stop Eating?

A cat may occasionally skip part of a meal or eat less than usual for a short time.

That does not automatically mean your cat is seriously ill.

However, a sustained loss of appetite is different.

Cornell Feline Health Center notes that appetite loss is a clinical sign associated with many different feline health problems and that it can have a serious effect on an adult cat if it persists for as little as 24 hours. Very young kittens can become vulnerable even more quickly.

This is one reason a cat that won’t eat should not simply be watched for several days while waiting for the appetite to return.

If your cat is refusing food completely, particularly if the problem approaches 24 hours or is accompanied by other symptoms, contact a veterinarian.

Kittens, older cats, and cats with existing medical conditions may need attention sooner.

Is Your Cat Not Eating or Just Eating Less?

Before trying to understand why your cat’s appetite changed, determine what the change actually looks like.

There is a difference between:

• completely refusing food;
• eating only a few bites;
• eating treats but refusing regular food;
• eating wet food but refusing dry food;
• approaching the bowl and then walking away;
• appearing interested in food but being unable to eat.

These details can provide useful clues.

For example, a cat that runs toward food but then backs away after trying to chew may have a different problem from a cat that shows no interest in food at all.

Veterinarians sometimes distinguish between true anorexia, in which the cat has little or no desire to eat, and pseudo-anorexia, in which the cat wants food but has difficulty picking it up, chewing, or swallowing it.

Why Is My Cat Not Eating?

There is no single cause of appetite loss in cats.

Sometimes the explanation is related to food or the environment. In other cases, the problem is medical.

Here are some possibilities veterinarians may consider.

1. A Change in Food

Cats can be particular about their food.

If you suddenly changed:

• food brand;
• flavor;
• texture;
• dry food to wet food;
• wet food to dry food;
• feeding location;

your cat may hesitate or refuse to eat the new food.

Even a reformulation of a familiar product may be enough for some cats to notice a difference.

If the loss of appetite started immediately after a diet change and your cat otherwise appears completely normal, consider whether the food itself may be involved.

However, do not automatically assume that a cat refusing food is simply being picky.

A medical problem can begin at the same time as a food change.

2. Stress or a Change in the Environment

Cats often prefer predictable routines.

Changes such as moving to a new home, introducing another pet, visitors, boarding, loud construction, or the loss of another animal can affect behavior and appetite.

Cornell notes that psychological and environmental factors can contribute to food avoidance, including the introduction of another animal or other stressful changes.

Even the location of the food bowl can matter.

Noise, heavy foot traffic, another animal nearby, a dirty bowl, or food placed too close to the litter box may discourage some cats from eating.

But stress should usually be considered after also thinking about possible medical causes—especially when appetite loss persists.

3. Dental or Mouth Pain

Sometimes a cat appears hungry but eating hurts.

Dental disease, inflamed gums, damaged teeth, oral ulcers, or other mouth problems can make chewing painful.

You may notice your cat:

• approaches the bowl but walks away;
• drops food while chewing;
• chews on only one side;
• prefers soft food;
• drools;
• paws at the mouth;
• has bad breath;
• seems interested in food but cannot comfortably eat.

Cornell specifically identifies dental pain as an important reason some cats refuse food.

A cat showing these signs should be examined by a veterinarian rather than simply being offered different foods indefinitely.

4. Nausea or Digestive Problems

A cat not eating much may be experiencing nausea or gastrointestinal discomfort.

Digestive problems can also cause:

• vomiting;
• diarrhea;
• constipation;
• abdominal discomfort;
• drooling;
• weight loss;
• reduced activity.

Merck lists appetite loss among the possible signs of digestive disease in cats.

If your cat is also vomiting, our English guide about cat throwing up can help you recognize additional warning signs—but vomiting together with refusal to eat deserves particular attention.

A cat that repeatedly vomits and cannot keep food or water down should be evaluated promptly.

5. Respiratory Illness or Reduced Sense of Smell

Cats rely heavily on smell when deciding whether food is appealing.

If a cat has nasal congestion from an upper respiratory problem, food may become less attractive simply because the cat cannot smell it normally.

You may also notice:

• sneezing;
• nasal discharge;
• watery eyes;
• noisy breathing;
• lower energy.

However, difficulty breathing is a separate and more urgent concern.

If your cat appears to be struggling to breathe, seek veterinary care immediately rather than trying to encourage eating at home.

6. Pain, Fever, or General Illness

Appetite often decreases when an animal does not feel well.

Pain, fever, inflammation, infection, and many systemic illnesses can cause a cat to eat less or stop eating.

Sometimes appetite loss may be one of the first signs owners notice.

Other clues may include:

• hiding;
• sleeping much more than usual;
• reduced grooming;
• reluctance to jump;
• unusual posture;
• irritability;
• weakness;
• changes in litter box use.

A cat does not need to be vomiting or have diarrhea to be sick.

A persistent change in appetite alone can justify veterinary evaluation.

7. Kidney, Liver, Pancreatic, or Other Disease

Loss of appetite can occur with diseases affecting many parts of the body.

Cornell lists conditions including kidney disease, diabetes, hyperthyroidism, pancreatitis, and hepatic lipidosis among the many health problems that can be associated with anorexia in cats.

Veterinarians may need to combine a physical examination with blood tests, urinalysis, imaging, or other tests to determine the cause.

This is particularly important in an older cat whose appetite suddenly changes without an obvious explanation.

8. A Foreign Object or Toxin

Cats sometimes chew or swallow things that are not food.

String, ribbon, pieces of plastic, small toys, plants, or other objects can potentially cause gastrointestinal problems.

Exposure to toxic substances can also cause appetite loss along with symptoms such as:

• vomiting;
• drooling;
• diarrhea;
• weakness;
• unusual behavior;
• difficulty breathing;
• tremors or seizures.

If you know or strongly suspect that your cat swallowed a foreign object or toxic substance, contact a veterinarian promptly.

Do not wait for appetite loss to become severe before seeking help.

Cat Not Eating but Drinking Water

A cat not eating but drinking water can sometimes appear less concerning because the cat is still drinking.

However, drinking water does not make prolonged refusal of food safe.

A cat may continue drinking while experiencing:

• nausea;
• dental pain;
• gastrointestinal disease;
• kidney disease;
• infection;
• other medical problems.

Pay attention to whether your cat is also drinking more than usual.

A combination of appetite loss and significant changes in thirst or urination is useful information for your veterinarian.

If you notice increased drinking as well, our guide about a cat drinking a lot of water covers that symptom in more detail.

Cat Not Eating and Throwing Up

Loss of appetite combined with vomiting deserves closer attention.

One isolated episode of vomiting does not always indicate a serious problem, but a cat that won’t eat and keeps throwing up may become dehydrated and may have an underlying gastrointestinal or systemic illness.

Contact a veterinarian promptly if your cat:

• repeatedly vomits;
• cannot keep water down;
• has blood in the vomit;
• appears painful;
• becomes weak or lethargic;
• may have swallowed a foreign object;
• may have been exposed to a toxin.

Do not wait several days for both symptoms to resolve on their own.

Cat Not Eating Much but Acting Normal

Sometimes a cat eats less while continuing to play, groom, and behave normally.

That can happen temporarily.

Possible explanations include:

• a change in food;
• warmer weather;
• mild stress;
• a change in routine;
• receiving more treats than usual.

But “acting normal” does not completely rule out illness.

Cats can hide signs of discomfort, and reduced appetite may appear before more obvious symptoms.

If your cat continues eating significantly less than usual, monitor how much is actually being consumed and contact your veterinarian if the change persists.

Why Not Eating Is Especially Important in Cats

Cats are not small dogs when it comes to prolonged food deprivation.

When a cat—particularly an overweight cat—stops eating, the body begins mobilizing stored fat for energy.

Large amounts of fat can accumulate in the liver, contributing to feline hepatic lipidosis, sometimes called fatty liver disease.

Merck describes feline hepatic lipidosis as a potentially lethal liver disease and notes that anorexia or food deprivation commonly precedes it.

This does not mean every cat that skips a meal will develop liver disease.

It means that prolonged refusal to eat should not be approached casually, especially in an overweight cat.

How Long Can a Cat Go Without Eating?

There is no single safe amount of time that applies to every cat.

Age, body condition, underlying illness, hydration, and how completely the cat has stopped eating all matter.

Cornell warns that sustained appetite loss can have a serious effect on an adult cat’s health after as little as approximately 24 hours, while very young kittens may become endangered much sooner.

For practical purposes, if an adult cat has stopped eating completely and the problem is approaching 24 hours, contact a veterinarian rather than planning to wait another day.

Seek help sooner if your cat:

• is a kitten;
• is elderly or frail;
• has diabetes or another known disease;
• is vomiting;
• seems painful;
• is weak or lethargic;
• may have swallowed something;
• may have been poisoned.

When Should I Take My Cat to the Vet?

Contact a veterinarian if your cat’s appetite has significantly decreased and does not quickly return to normal.

Seek veterinary advice particularly when:

• your cat has stopped eating completely;
• the refusal is approaching or reaching 24 hours;
• your cat is losing weight;
• vomiting or diarrhea is present;
• your cat is unusually quiet or weak;
• your cat appears painful;
• drinking or urination has changed significantly;
• the cat approaches food but appears unable to chew or swallow;
• there is drooling or obvious mouth discomfort;
• you suspect a foreign object or toxin;
• your cat has an existing medical condition.

A cat refusing food is not a diagnosis. The veterinarian’s job is to determine why the appetite has changed.

What Can I Observe Before the Veterinary Visit?

A few notes from home can be very useful.

Try to determine:

• when your cat last ate a normal meal;
• approximately how much food has been eaten since then;
• whether treats are still accepted;
• whether wet or dry food is preferred;
• whether your cat seems hungry but unable to eat;
• whether there has been vomiting;
• whether stool or urination has changed;
• whether water intake has changed;
• whether your cat has lost weight;
• whether behavior or activity is different;
• whether there was a recent food change;
• whether a new pet or stressful event occurred;
• whether your cat may have reached a plant, medication, string, or another object.

If several people feed the cat, make sure everyone knows you are monitoring food intake.

Otherwise, it is easy for each person to assume someone else fed the cat.

What Can I Try at Home?

If your cat has only recently started eating less and otherwise appears well, you can make food more appealing while monitoring closely.

You might:

• offer the familiar food your cat normally enjoys;
• make sure the bowl is clean;
• place food in a quiet location;
• keep food away from the litter box;
• separate pets during meals if there is competition;
• offer an appropriate wet food your cat already knows;
• gently warm wet food to increase its aroma.

These measures are meant to encourage eating while you observe the situation.

They should not delay veterinary care when your cat has stopped eating, the problem persists, or other symptoms are present.

What Not to Do if Your Cat Won’t Eat

Avoid trying random treatments when you do not know why your cat has stopped eating.

Do not:

• give human medications;
• give appetite stimulants without veterinary guidance;
• suddenly offer large amounts of unfamiliar food;
• assume your cat is merely being stubborn;
• wait several days after complete food refusal;
• force food into the mouth without veterinary instruction.

Cornell notes that force-feeding can sometimes worsen a cat’s aversion to food, and nutritional support should be planned with veterinary guidance when a cat is unable or unwilling to eat normally.

The appropriate treatment depends on the cause.

Frequently Asked Questions

Why Is My Cat Not Eating but Acting Normal?

A cat may temporarily eat less while still behaving normally, particularly after a minor routine or food change.

However, persistent appetite loss should not be dismissed just because your cat is still active.

Monitor actual food intake rather than relying only on behavior.

If your cat continues eating very little or stops completely, contact your veterinarian.

Why Is My Cat Not Eating but Drinking Water?

A cat may continue drinking even while appetite is reduced.

This does not identify the cause and does not eliminate the risks associated with prolonged food refusal.

If the appetite loss persists, or drinking and urination have also changed, veterinary evaluation is appropriate.

Why Won’t My Cat Eat Their Regular Food but Will Eat Treats?

Possible explanations include preference, a change in the food, dental discomfort, nausea, or simply learning that refusing regular food results in treats.

If your cat is consuming enough treats to reduce hunger, that can also complicate the picture.

Persistent refusal of normal food deserves attention, especially if total food intake has dropped substantially.

My Cat Smells the Food but Won’t Eat. Why?

This behavior can occur when a cat feels nauseated, dislikes the food, cannot smell it normally, or experiences pain while attempting to eat.

Watch whether your cat tries to chew, drops food, drools, or repeatedly approaches and leaves the bowl.

Those observations can help your veterinarian distinguish between lack of appetite and difficulty eating.

Is It Dangerous if My Cat Doesn’t Eat for 24 Hours?

A sustained loss of appetite can become medically important in cats.

Cornell advises that anorexia can have a serious impact on an adult cat’s health if it persists for as little as 24 hours.

Do not treat 24 hours as a target you must wait for. Contact a veterinarian sooner if other warning signs are present.

Can Stress Make a Cat Stop Eating?

Yes, stress can contribute to appetite loss.

Moving, boarding, new animals, changes in household routine, and other stressful events can influence eating behavior.

However, a persistent loss of appetite should not automatically be blamed on stress without considering medical causes.

Can Dental Problems Make a Cat Stop Eating?

Yes.

Painful teeth, gum disease, or other oral problems can make chewing uncomfortable.

A cat may still appear hungry but have difficulty eating, which is one form of what veterinarians call pseudo-anorexia.

Your Cat’s Normal Appetite Matters

You know your cat’s routine better than anyone.

Perhaps your cat normally runs toward the bowl as soon as food appears. If that same cat suddenly begins sniffing meals and walking away, the change matters even if you cannot identify another symptom yet.

Look at the whole picture:

food intake, water intake, body weight, vomiting, litter box habits, activity, grooming, and behavior.

A small temporary variation may resolve.

But a cat not eating, eating dramatically less than usual, or showing other signs of illness deserves attention.

Do not wait until your cat appears severely sick.

If the loss of appetite persists, your cat stops eating completely, or you notice other warning signs, contact a veterinarian.

Sources Consulted

• Cornell Feline Health Center — Anorexia.

Cornell Feline Health Center — Feeding Your Cat.

Merck Veterinary Manual — Feline Hepatic Lipidosis. VCA Animal Hospitals — Anorexia in Cats.