My cat is sick, lost weight, and has a swollen, limping leg. Why?

Question

For the last two months my cat has been sick. He stopped eating & lost a large amount of weight. He basically became skin and bones. we took him to the vet they gave a round of antibiotics & a pain shot for his back. The pain shot helped him but he got worse so we took him back &they gave a stronger round of antibiotics. By this point he had his appetite back but then lost it. we also noticed his back leg is swollen and he's limping you can feel a knot in it compared to the other. Thoughts? Pet's info: Cat | Mixed Breed | Male | neutered

Sarah Box, BVSc · Accepted Answer

Poor Tommy! I would recommend returning to your vet for a follow-up. The swelling on Tommy's leg does not sound good, especially combined with the other symptoms you have reported. One possible cause of the swelling would be some kind of infection. However, since Tommy has also lost a lot of weight and has been off his food I worry more about a cancerous process such as lymphoma, or perhaps a bone mass. Your vet will be able to do bloodwork and X-rays, and likely will want to take some fine needle samples of the 'knot' to look at under the microscope. They may want to send these samples out to be looked at by a pathologist too. Treatment options can vary depending on the findings of the diagnostic tests. They could range from surgery, to oral medications, to injectable chemotherapy. I hope you are able to get to the bottom of things soon for Tommy and that he starts feeling better.

My cat is sick, lost weight, and has a swollen, limping leg. Why?

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