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My cat is limping, shaking, and has a lump under its armpit. What's wrong?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | unneutered | 19 years and 1 month old | 8 lbs

my cat is limping and i found a big knot under his armpit he is also shaking should i be concerned

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on February 22nd, 2017

Yes, I would be concerned because it sounds like Scout is in pain if he's limping and shaking. He could have been injured causing the big knot under his armpit, or he could have an abscess, cyst, benign tumor, or malignant tumor causing the large lump. I would take him into a vet tonight given his old age and symptoms. The vet can examine him and diagnose what is causing his symptoms and the lump. Once the causes are diagnosed, the vet can discuss treatment options. Please do not give Scout any human pain medications, as many are toxic to cats and are fatal if given.

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