FaunaHub

Cat Health Symptom Awareness

Why is my cat not eating?

This can have many causes

Loss of appetite in cats is taken more seriously than in dogs because cats can become unwell relatively quickly when not eating. This page lists broad cause categories and the warning signs that should prompt veterinary contact. It is not a diagnosis or treatment guide. If your cat refuses food for an extended period, or refusal is paired with other concerning signs, contact a licensed veterinarian.

Possible cause categories

Categories only — not a diagnosis. A veterinarian can identify the specific cause through examination and tests.

  • Gastrointestinal upset — only a vet can identify the specific cause.
  • Dental pain or oral conditions.
  • Stress, environmental changes, or behavioural causes.
  • Suspected toxin exposure or recent unusual ingestion.
  • Pain from injury or an internal condition.
  • Underlying chronic or systemic conditions that need professional assessment.

Emergency signs — contact a vet immediately

Urgent

If any of the following are present, treat the situation as urgent and contact a licensed veterinarian or emergency clinic.

  • Refusal to eat for more than a short period — cats are more vulnerable than dogs to extended fasting
  • Refusal to eat paired with lethargy, vomiting, diarrhoea, or hiding
  • Pain signs — vocalising, restlessness, unwillingness to move
  • Collapse, weakness, or unresponsiveness
  • Suspected toxin exposure
  • Difficulty urinating, especially in male cats — can be life-threatening
  • Pale, yellow, or blue-tinged gums
  • Yellowing of skin, gums, or eye whites

What you can safely observe and report

Observe

Notes that help a veterinarian make an informed assessment when you call or visit.

  • How long has appetite been reduced, and is the cat refusing all food or only some?
  • Is water intake normal?
  • Is the cat hiding, withdrawn, or behaving unusually?
  • Other signs: energy, vomiting, diarrhoea, breathing, weight, urination.
  • Recent dental work, surgery, or known existing conditions.
  • Recent diet, environment, or routine changes.
  • Any visible injuries, swelling, or signs of pain?

What not to do

  • Do not give human medications (including anti-nausea, anti-diarrhoea, or pain medications) unless a licensed veterinarian has specifically instructed you to. Several common human medications are dangerous to cats.
  • Do not try to diagnose based only on this page or any online content.
  • Do not delay contacting a veterinarian if poisoning is suspected, if your cat has collapsed, is having seizures, has trouble breathing, or is in severe pain.
  • Do not rely on calculators, guides, or AI tools for emergency decisions.
  • Do not ignore symptoms that worsen, persist, or pair with other concerning signs.

When to contact a veterinarian

Contact a veterinarian or emergency clinic immediately if appetite loss is paired with any emergency sign, if you suspect poisoning, or if the cat seems severely unwell. Cats are particularly at risk if they go without food for prolonged periods because of how their liver metabolism works. Specific timing guidance is case-specific — call a clinic for telephone triage rather than relying on a generalised number.

Why is my cat not eating? — Frequently Asked Questions

How long can a cat safely go without eating?
There is no safe universal figure, and cats are more vulnerable than dogs to extended fasting because of their liver metabolism. Overweight cats are at higher risk. Do not rely on online numbers — contact a veterinarian if your cat is refusing food for an extended period or is behaving unusually.
My cat skipped one meal — should I worry?
A single skipped meal in an otherwise normal cat who is alert, drinking, and behaving normally is often not an emergency, but should be monitored. If appetite is still off, or if other signs appear, contact a veterinarian. Hiding and withdrawal are particularly important behavioural signs in cats.
Should I try a different food?
Changing food in response to appetite loss can mask the underlying cause and sometimes worsen things. Some human foods are also unsafe for cats. Talk to a veterinarian before changing diet, particularly if your cat has any chronic condition.

Sources and further reading

Authoritative references used for general educational context. External links open in a new tab. These sources do not endorse FaunaHub.