FaunaHub

Cat Health Symptom Awareness

Why is my cat vomiting?

This can have many causes

Vomiting in cats can have many possible causes — from a single mild upset to a serious underlying condition. This page lists broad cause categories and the warning signs that should prompt urgent veterinary contact. It is not a diagnosis or treatment guide. If vomiting is severe, repeated, or paired with other concerning signs, contact a licensed veterinarian or emergency clinic.

Possible cause categories

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

  • Dietary indiscretion or sudden food changes.
  • Suspected toxin exposure — common household risks include lilies (particularly dangerous to cats), human medications, and certain plants and foods.
  • Hairballs in some cats, though repeated retching warrants professional assessment.
  • Gastrointestinal infections, inflammation, or parasites.
  • Foreign-body ingestion or obstruction (string, thread, small objects).
  • Underlying chronic or systemic conditions that a veterinarian can investigate.

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.

  • Repeated vomiting that does not stop
  • Blood in vomit or stool
  • Lethargy, collapse, or unresponsiveness
  • Inability to keep water down (dehydration risk)
  • Suspected ingestion of a toxic substance — especially lilies, human medication, or unknown plant
  • Pale, yellow, or blue-tinged gums
  • Distended or painful abdomen
  • Repeated unproductive retching

What you can safely observe and report

Observe

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

  • How many times and how recently has the cat vomited?
  • What did the vomit look like (food, foam, bile, blood, hair)?
  • Can the cat keep water down?
  • Other signs: appetite, energy, hiding, urination, stool, breathing.
  • Recent diet changes or access to plants, household chemicals, medications.
  • Recent medications, supplements, or known existing conditions.

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 any emergency sign is present, if you suspect poisoning (especially lily ingestion or human medication), or if the cat seems severely unwell. Contact a veterinarian promptly if vomiting is repeated, persists, or is paired with other signs (lethargy, appetite loss, hiding, dehydration). Cats can become unwell quickly — when in doubt, call.

Why is my cat vomiting? — Frequently Asked Questions

Is occasional hairball vomiting normal?
Some cats occasionally bring up hair, but repeated retching, frequent hairball-related vomiting, or vomiting paired with other signs is not something to dismiss — it can indicate underlying issues. Contact a veterinarian if you are unsure.
My cat ate a lily — is that an emergency?
Yes. True lilies and several related plants are well-documented as highly toxic to cats. Treat any known or suspected lily exposure as a veterinary emergency and contact a veterinarian or an animal poison-control service immediately. Do not wait to see whether symptoms develop.
Should I withhold food or water?
Cats can become unwell more quickly than dogs when not eating or drinking. Do not withhold food or water for extended periods based on general online guidance. Ask a veterinarian how to handle hydration and feeding in your specific situation.

Sources and further reading

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