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Why is my 13-year-old cat vomiting, diarrhea, and gaining weight?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Female | spayed | 12 years and 9 months old | 10 lbs

13 year old female cat. Began vomiting occasionally about a month ago. Frequency has increased. Cat is currently unable to keep food down. She vomits immediately after eating even a tiny amount. Litter box contained yellowish/light brown diarrhea. Cat is aggressive with other animals. Cat appears to have gained weight. Her stomach is larger and rounder than it was 3 months ago. I'm not sure how she could be gaining weight considering how little she eats and how often she vomits.

1 Answer

Most Helpful Answer

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Answered By Lindsey Edwards MVB, BSc, IVCA

Veterinarian

Published on July 14th, 2017

Please have her assessed by a vet as soon as possible, the abdominal enlargement in the face or persistent vomiting and diarrhea is a huge concern. Fluid build up , liver disease and tumors are all possibilities, early diagnosis is required in order to fully assess all options for her care

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