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My cat is losing weight but eating and drinking a lot. What's wrong?

Updated On September 23rd, 2025

Pet's info: Cat | Maine Coon | Male | neutered | 8 years and 4 months old | 10 lbs

my cat is wasting away.Has lost a lot of weight.Eats voraciously,and after feedin him, still acts hungry,does all his business on the floor,drinks a lot of water.Can't afford a vet, and want to help him. What could be wrong? Your help is appreciated.Thanks, Harriet

5 Answers

Most Helpful Answer

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Answered By Rosemary Barber, DVM

Veterinarian

Published on May 17th, 2017

Good morning! It sounds as if Bunky might have diabetes, or kidney problems, or even an excessive amount of thyroid hormone (hyperthyroidism), based on the weight loss, and excessive thirst. Unfortunately, these are conditions that would need to be diagnosed by blood and urine tests, which would involve taking him to see his vet. Thyroid problems are very treatable with an oral medication, and diabetes is treatable with daily insulin injections, or sometimes just with a special food your vet can prescribe. At home, there isn't too much that you can do; I wish there was more I could suggest!

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Other Answers

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    Answered By Lindsey Edwards MVB, BSc, IVCA

    Veterinarian

    Published on

    Increased appetite and weight loss is a red flag for serious hormonal conditions such as diabetes or hyperthyroidism and require correct diagnosis and treatment by a vet to prevent severe complications

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    Answered By Dr. Melanie, BVSc MS

    Veterinarian

    Published on November 18th, 2019

    Not every cat presents the same way with diseases, but this behavior (increased appetite, increased thirst, increased urination, significant weight loss) could be caused by diabetes or kidney disease. I would have Zorro seen by a vet in the morning for a geriatric blood panel and urinalysis.

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    Answered By Rebecca, DVM

    Veterinarian

    Published on September 10th, 2017

    I recommend a vet visit for this kitty. Diabetes mellitus or hyperthyroidism are two diseases that can make a cat eat ravenously but still lose weight. Parasites can also cause this. These can be easily diagnosed with booodtests and stool samples. Once a diagnosis is made the vet can discuss treatment options with your grandfather. Thank you for using Petco Pet Education Center, formerly Petcoach.

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    Answered By Dr. Strydom, DVM

    Veterinarian

    Published on June 16th, 2019

    There are three very common diseases that cats get that can cause these symptoms: 1. diabetes 2. hyperthyroidism 3. kidney disease All can be easily tested for with some simple blood testing. I suggest you have Earl to your vet for an exam and blood testing.

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