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My cat is hiding with a painful lump after sub-Q fluids. Is it normal?

Updated On September 23rd, 2025

Pet's info: Cat | American Shorthair | Male | neutered | 18 years and 9 months old | 9 lbs

After subcutaneous fluid therapy my cat developed a large lump of fluid on his right side and he is now hiding under the bed. He yowled when I tried to pick him up, as if the bubble of fluid is painful. What could be the problem? I give him 250ml of lactated ringers every 7-10 days. This was the third fluid delivery and this has never happened before. I had to adjust the needle placement several times but did not replace it. Could I have introduced an infection? Could it be fluid overload?

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on December 25th, 2023

Thank you for contacting Petco Pet Education Center, formerly Petcoach with your question about George. It is normal to have a lump of fluid develop where the subcutaneous fluids were given. This pocket of fluid will be absorbed over the next couple of hours. As long as you used a new needle to give the fluids, it is not likely you introduced an infection; even if you did, it would show up immediately. The lump will be due to the fluids, and again it is normal. It may feel a big uncomfortable to him for now, and I'd leave him be and let him hide. It should resolve in a few hours. I hope this helps.

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