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My cat's lymph nodes are swollen, but he's active. What's wrong?

Updated On September 23rd, 2025

Pet's info: Cat | American Shorthair | Male | neutered | 8 months and 21 days old | 8 lbs

Hi, My cat has had swollen lymph nodes in his legs (behind the knees), since I got him in August from the pound. My vet ran bloodwork, took samples from the nodes, ran a fecal test. The only thing not normal was worms in his stomach. The vet gave him the pill to get rid of them. His nodes have not reduced in size. He's super active and eats like crazy! He even likes people food. He's incredibly loving and purrs every time I tough him. He's so normal and perfect. What's wrong with my cat?

1 Answer

Most Helpful Answer

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Answered By Dr. Elizabeth

Veterinarian

Published on January 22nd, 2019

I recommend to discuss the lymphnode enlargement with your doctor since she has the test results. Lymphnodes can be reactive meaning they enlarge but the cause is not known. That’s very good if the aspirate of the lymphnodes did not come back as cancerous. Sometimes you never know why the nodes stay enlarged. Sometimes there can be an underlying allergy to something in the environment or food. Sometimes parasites can cause it. I recommend to discuss the continuing enlargement with the doctor and decide what makes the most sense as far as what to do next (if anything). I hope this is helpful and please feel free to post any additional questions.

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