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My cat has a swollen lip and bad breath. What's wrong with him?

Updated On September 23rd, 2025

Pet's info: Cat | American Shorthair | Male | unneutered | 10 lbs

My cats lip is swollen and his breathe stinks! We thought it was an allergic reaction. Do you know what it is?

2 Answers

Most Helpful Answer

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Answered By Emily, DVM

Veterinarian

Published on June 9th, 2017

If you could post a picture of Luther's mouth that would be helpful. What you're describing could be severe dental/oral disease or even a cancer of the mouth depending on his age. It could also indicate an abscess from either a bite wound or sometimes even evenomation from something like a snake. Luther should be examined by a veterinarian as soon as possible. If he cannot go to a veterinary clinic you can try posting a picture of what's going on or even to make a consult request which would allow us to get a more history from you as well as give more detailed information to you.

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    Answered By Rebecca, DVM

    Veterinarian

    Published on

    There are multiple things that could cause a swollen lip in a cat. It could potentially be an abscess or infection, eosinophilic complex which can be related to allergies, or if he's having very bad breath he may have a form of stomatitis or gum disease. I would recommend having Luther evaluatedby the vet to find out what is causing the swelling and the halitosis. An allergic reaction like a bee sting or something simple that would cause swelling should not be causing bad breath as well so it seems like something more may be going on.

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