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My cat has high thyroid. What are the symptoms and long-term effects?

Updated On September 23rd, 2025

Pet's info: Cat | American Shorthair | Male | neutered | 11 years and 9 months old | 11 lbs

How does a thyroid gland effect our cat. The blood work is a little high Bob

1 Answer

Most Helpful Answer

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Answered By Jennifer Summerfield, DVM CPDT-KA

Veterinarian, Certified Dog Trainer

Published on April 21st, 2019

Hi there. Hyperthyroidism can cause symptoms like increased vocalization and irritability, weight loss, increased appetite, vomiting or diarrhea, and/or increased drinking and urination. It also contributes to high blood pressure, and is hard on the heart and kidneys long-term. If Midnite's thyroid levels are high, treatment would generally be recommended to address this.

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