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Why is my cat's face suddenly swollen under the jaw? Is it serious?

Updated on September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 7 years and 10 months old | 12 lbs

Cats face is swollen under jaw, has come on suddenly over 24 hours

2 Answers

Most Helpful Answer

Answered By Stacey Anstaett, DVM

Veterinarian

Published on August 18th, 2018

A sudden swelling under the jaw could be an abscess. Typically these need to be seen by a vet; as they often need to be lanced/drained to get the pus and infection out; then started on antibiotics. Pain medication may be given as well.
If he isn't eating, if he's acting lethargic or otherwise not feeling well (vomiting, diarrhea, any change in breathing) seek emergency care. If your vet's office is closed, they likely have a message with who to call or where to seek after hours care in the case of an emergency. If he's still eating and acting ok, you can call and make an appointment at the first possible time.

I hope that helps you! Thanks for asking Petco Pet Education Center, formerly Petcoach!

1Pet Parents found this answer helpful

Related Answers from Veterinarians

Answered By Daniel Fonza, DVM
Veterinarian
Published on September 29th, 2017
Hi there and thank you for using Pet Coach! Judging from the photos you have included, there is quite a severe amount of swelling under the jaw. If the area has not resolved on antibiotics and it is a clear fluid coming out of the swollen area, there is a good chance that this is what we call a sialocele or this could be an abscess. An abscess, unless drained, is difficult to treat with just antibiotics alone. Most of the time the abscess needs to be lanced using a scalpel blade and the contents removed along with flushing out with an antiseptic solution. If this is not performed, there is a good chance it will not resolve. I would recommend sedating Megalodon and draining the contents from this swelling to see if this helps resolve the problem. I hope this helps! Please let me know if you have any other questions or concerns. I am also available via consultation if needed.
1Pet Parents found this answer helpful

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