Petco Text Logo
Petco Pet Logo

Cat has lump, peeing, diarrhea after vaccine. Are symptoms linked?

Updated On September 23rd, 2025

Pet's info: Cat | Savannah Cat | Female | spayed | 11 lbs

I don't know if any of these events are related, but my cat got vaccinated a month ago and developed a lump where he was vaccinated 2 weeks afterwards. He has suddenly also started peeing on the furniture 2 weeks ago, and now has had diarrhea for 2 (maybe 3) days in a row. He is still acting normal, and there hasn't been any sudden changes so I'm not exactly sure what the cause of some of the issues are

1 Answer

Most Helpful Answer

Image profile

Answered By Jessica Desrosiers

Veterinary Technician

Published on August 24th, 2018

It would be hard to say if the vaccine is related without knowing what vaccine was given and how Leo has reacted in the past. Sudden behavioral or health changes are always concerning, so I would definitely bring it up with your vet and have Leo come in for an exam. Accidents can sometimes indicate underlying pain or illness, so ruling out more serious issues is best. I would also let your vet know about the lump that developed so they can monitor it or change how any future vaccine are given to Leo to help minimize reactions.

Vote icon

1Pet Parents found this answer helpful

image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Sponsored