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Why does my 9-month-old kitten have a painful belly lump and sore?

Updated on September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | unneutered | 9 months and 9 days old | 4 lbs

Okay so I have a kitten approximately 9months old with a lump forming on the right side of his underbelly below his ribs. It's rather large and seem to cause him a bit of discomfort when picked up. He normally likes being picked up. In the photos provided is a picture of a sore that i found on him about a week or so ago, and in the second, my finger is on the lump I've found. I hope this helps.

1 Answer

Most Helpful Answer

Amber Da Silva, DVM

Answered By Amber Da Silva, DVM

Veterinarian

Published on January 10th, 2018

Hello and thanks for using Petco Pet Education Center, formerly Petcoach. What a cutie Chewwy is! The sore could be an infection of yeast or bacteria, ringworm or mites. It will most likely need to be tested by a veterinarian to determine exactly what it is. The lump on the side is concerning if it is painful and growing. At his age an abscess or a hernia are possibilities. I would also recommend getting that examined by a veterinarian so that they know how to treat him. I hope this helps and that Chewwy gets feeling better soon!
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