Why is my cat vomiting white foam?

Velto answer

A cat vomiting white foam is most often bringing up a mixture of saliva and gastric juices from an empty stomach. The most common causes are prolonged fasting, hairballs, and stomach irritation (gastritis). An isolated episode in an otherwise healthy cat is not usually a cause for concern; however, repeated vomiting or vomiting accompanied by other signs should prompt a visit to the vet.

Fasting: the most common cause

When a cat's stomach is empty for too long, digestive juices can build up and irritate the stomach lining. This is a result of **fasting** on an **empty stomach**. The cat then brings up a whitish foam, often in the morning before being fed. Splitting their daily food into several **small meals**, or offering a small snack in the evening, is often enough to solve the problem.

Hairballs

While **grooming**, cats swallow hair which can clump together in the stomach. To get rid of them, a cat might vomit white foam, sometimes followed by a compact hairball. This can be limited by regular **brushing** — especially for long-haired breeds — and a suitable diet to help manage **hairballs**.

Gastritis and stomach irritation

**Gastritis** (inflammation of the stomach) can be caused by eating grass, a **sudden change in diet**, spoiled food, or a **foreign body**. Vomiting white foam can sometimes be accompanied by a loss of appetite or a tender abdomen.

Other possible causes

More rarely, vomiting white foam can be linked to **kidney disease**, liver problems, diabetes, parasites, or ingestion of a **toxic substance** (e.g. plants, household products). These causes cannot be diagnosed remotely: only a **vet** can confirm them with an examination.

When should you see a vet?

See a vet immediately if the vomiting occurs several times in one day, lasts for more than 24 hours, contains blood, or is accompanied by lethargy, refusal to drink, diarrhoea, or abdominal pain. A kitten, an elderly cat, or a cat with a pre-existing health condition should be seen by a vet promptly.

Frequently asked questions

My cat has vomited white foam just once, is it serious?

A single episode in a bright, alert cat that is eating and drinking normally is not usually a cause for concern. Monitor them for the next 24 hours: if it happens again or if other signs appear, consult a vet.

Why does my cat vomit white foam in the morning?

In the morning, the stomach has been empty overnight, so gastric juices can irritate the stomach lining. A small snack in the evening or splitting meals throughout the day often helps to resolve this 'hunger vomiting'.

Should I withhold food after my cat has vomited?

For a healthy adult cat, you can wait a few hours before offering a small, light meal again, ensuring fresh water is always available. Never fast a kitten or a diabetic cat without veterinary advice.

What's the difference between vomiting and regurgitation?

Vomiting is an active process preceded by nausea and abdominal contractions, and the contents are either digested or foamy. Regurgitation is a passive process that happens effortlessly, usually soon after a meal, bringing up almost undigested food. Frequent regurgitation also warrants veterinary advice.

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