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My hamster has a red bump under her arm. Could it be cancer?

Updated On September 23rd, 2025

Pet's info: Small Animal | Unknown - Small Animal | Female | unspayed | 1.5 lbs

I recently saw underneath my hamster when she stood up and noticed a large red bump underneath her left arm, could it be cancer? If it is should I go ahead and put her down so she doesn’t suffer?

1 Answer

Most Helpful Answer

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Answered By Claudia Fioravanti

Veterinarian

Published on June 7th, 2018

It is difficult to tell without examining Peanut, it is a big decision to take for any pet big or small. If the lump is affecting quality of life then yes but I would be guided by what your vet advises you.

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