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My cat has a swollen lip. Is it a spider bite? What should I do?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Female | spayed | 2 years and 4 months old | 8.5 lbs

I posted earlier that my cat has a swollen lower lip. I just remembered that she battled with a spider earlier and may have eaten it. Could this be the cause? Can I do anything to help with the swelling? It looks painful but she's acting normally.

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2 Answers

Most Helpful Answer

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Answered By Andrea M. Brodie, DVM

Veterinarian

Published on April 28th, 2017

Yes a spider bite can cause a swelling. the swelling does not look very extensive so likely was not caused by one of the "nasty" spiders such as a black widow or a brown recluse. If your kitty, however, starts getting abdominal pain (rigid belly) or the swelling starts to change color, then a visit at the emergency room is the next step. If Maisey eats, drinks, lets you touch the swelling and otherwise does not act ill, then I think you have nothing to worry about and the swelling should go away within a day or so.

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    Answered By Dr. Melanie, BVSc MS

    Veterinarian

    Published on

    If the spider bit her during the battle, and depending on the type of the spider, then yes that certainly could be the cause of the swelling. You can try applying a cold compress if Maisey will let you to see if that helps with the swelling, but please do not give her any human medications. Many human ones are toxic to cats and can be fatal if given. Have her seen by a vet in the morning, but certainly take her into one right away if the swelling gets larger, she has trouble eating, or becomes very lethargic.

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