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My cat is tired and inactive after fleas. Should I go back to the vet?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Female | 11 years and 4 months old | 9 lbs

My feline Blu had fleas. Now she won't leave my chair except to eat and use her litter box. What do you suggest. he has been to a vet.

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1 Answer

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Answered By Jenna Beyer, DVM, MBA, cVMA

Veterinarian, Certified Veterinary Acupuncturist

Published on October 10th, 2017

I would start by treating the fleas. Fleas can be extremely aggravating and cause some pets to have weird changes in behavior. With large infestations of fleas, they can also cause anemia, which can cause profound lethargy. Other causes of lethargy can range from internal medical illness (diabetes, kidney disease, liver disease), infection, pain from arthritis, etc. I would recommend that you have Blu rechecked by her vet to look into these possible causes. The vet may recommend bloodwork to see how things are going inside of her body.

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