What to Do if Your Cat Is Throwing Up Brown Liquid

In this guide

Cat vomit comes in a surprising range of colours and textures, and most of the time it is not something to panic over. Brown liquid, however, is one of the combinations that genuinely deserves your attention, since it can range from harmless to a sign of a serious internal problem.

What the brown colour can mean

Brown vomit is often a mix of partially digested food, bile, and sometimes blood that has been broken down by stomach acid, which can turn it a dark brown or coffee ground like colour. This kind of digested blood in vomit points towards bleeding somewhere in the upper digestive tract, which can stem from causes as varied as a swallowed hairball irritating the stomach lining, ulcers, a foreign object, chronic kidney disease, or, less commonly, a tumour.

When it might be relatively minor

An otherwise healthy cat that vomits brown liquid once, especially a longer haired cat prone to hairballs, and then goes back to eating, playing and behaving normally, is less likely to be dealing with an emergency. That said, any cat vomiting more than once a week, even without other symptoms, is worth mentioning to your vet at the next routine visit rather than treating as background noise.

When to seek care promptly

• Repeated vomiting within a short period
• Vomit with a strong, foul odour
• Lethargy, weakness, or hiding more than usual
• Loss of appetite
• Pale gums
• Black, tarry stools, which can indicate digested blood passing through the rest of the digestive tract as well

If any of these accompany the brown vomit, treat it as a same day vet visit rather than a wait and watch situation, since internal bleeding and organ related causes can worsen quickly.

What the vet visit typically involves

Diagnosis usually starts with a physical exam and history, followed by blood work to check organ function, and imaging such as X-rays or ultrasound if a blockage or internal bleeding is suspected. Treatment is entirely dependent on what is found, ranging from simple dietary and hairball management, to hospitalisation and surgery for a foreign object or serious bleeding. Do not withhold food or water for more than a few hours without your vet's guidance, particularly in a cat that already has reduced appetite, since prolonged fasting carries its own risks.

Vomiting versus regurgitation

It helps your vet enormously if you can describe whether your cat strained and heaved before the brown liquid appeared, which points to true vomiting, or whether it simply reappeared with little effort, which points to regurgitation and a different set of causes such as an oesophagus problem. The two are easy to mix up in the moment but mean quite different things diagnostically.

Reducing hairball related vomiting

If hairballs are a recurring factor, regular brushing to remove loose fur before your cat swallows it during grooming, along with a hairball control diet or the occasional hairball paste recommended by your vet, can meaningfully cut down how often this happens, particularly in long haired cats.

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