Symptoms

Why is my cat vomiting?

Updated 2026-07-16 · Not a substitute for professional veterinary care

Depends how often

Short answer

An occasional hairball or a single vomit in an otherwise bright cat is often minor. But frequent vomiting (more than about once a week), repeated vomiting in a day, or vomiting with lethargy, not eating, or blood is not normal and needs a vet. Cats hide illness, so persistent vomiting is a signal worth acting on.

What is normal and what is not

The myth that cats just vomit sometimes causes real problems to be missed. An occasional hairball is common, but regular vomiting is not something to accept. If your cat vomits more than about once a week, or several times in a day, that is a pattern to investigate.

Common causes

Hairballs, or eating too fast
A sudden diet change or a food sensitivity
Eating something it should not have, including toxins (see the food-safety guides)
Intestinal parasites
Chronic disease: kidney disease, hyperthyroidism, inflammatory bowel disease, or diabetes

When vomiting is urgent

Repeated vomiting over a few hours, or unable to keep water down
Vomiting with lethargy, hiding, or not eating
Blood in the vomit, or it looks like coffee grounds
A suspected toxin, string, or foreign object
Retching with a swollen or painful belly

Any of these means call a vet promptly. Vomiting plus not eating is especially concerning in cats because of the fatty-liver risk.

When in doubt, call a vet. This guide is general information for cat owners. It is not veterinary advice, and it is not a substitute for professional veterinary care, diagnosis, or treatment. If your cat is in distress, contact a veterinarian or your nearest emergency clinic straight away.

Notice the quiet changes early

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Common questions

Is it normal for cats to vomit hairballs?

An occasional hairball can be normal, but frequent hairballs or vomiting more than about once a week is not, and deserves a vet check, sometimes it is a sign of an underlying gut or skin issue.

My cat vomited once but seems fine. Should I worry?

A single vomit in a bright, eating, playing cat is often minor. Watch for more vomiting, lethargy, or loss of appetite, and call a vet if any appear.

Sources

This guide draws on the following veterinary references: