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Why is my red-eared slider lethargic, not eating, and has sunken eyes?

Updated On September 23rd, 2025

One of my two, three year-old red eared-sliders has become lethargic, not wanting to eat. The turtle sleeps all day and moves very little. Also, its eyes have began to sunk, and every time it is underwater it closes them; they get red a little, as if they itched. My other red-eared slider eats plenty, is always on the move, and weighs plenty, in contrast to the first one which weighs little (it used to weigh more maybe two months ago). I didn't notice until recently and am very concerned.

2 Answers

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on May 30th, 2017

If possible, separate them until you get a diagnosis. Get a stool sample from the sick turtle and submit it to your veterinarian to diagnose intestinal parasites or bacterial infection. An exam with your veterinarian or a vet experienced in treating reptiles is strongly recommended given the marked weight loss and lethargy. Increase water and ambient temperatures by a few degrees to support the sick turtle. Offer a biologically appropriate, species specific diet as well as proper vitamin and mineral supplementation. Check the UVB bulb and replace it of it is older than 6 months old. The symptoms you describe have multiple causes, so it is important to have an exam and testing to reach a diagnosis. Treatment will depend on the diagnosis. Follow the link below for information regarding care and husbandry of red eared sliders. http://www.anapsid.org/reslider.html

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    Answered By Dr. Dayna, DVM, CVA

    Veterinarian, Certified Veterinary Acupuncturist

    Published on September 15th, 2017

    Unfortunately I wouldn't recommend any medications without an examination, however most of the time reptiles become sick because we aren't providing them with the environment and or food that they are designed for. A great resource is www.anapsid.org for correct temperatures , humidity, light sources, and diets for all turtle species. In general providing a turtle with a very warm asking area 90 degrees or so can help them seek a "behavioral fever" to help fight off infection. If he isn't improving he may need antibiotics from a veterinarian. I hope this provides you with some help!

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