Feline Hyperthyroidism I-131 radioiodine services

Treatment for cats with hyperthyroidism

When a cat is diagnosed with feline hyperthyroidism, it's important to find radioiodine treatment fast. Hyperthyroidism causes a cat's thyroid to produce too much T3 and T4 hormone, resulting in swelling of the neck and tumors. If not treated, this condition can lead to many issues, such as hypertension, high blood pressure, heart disease, and organ failure. Essentially, a much shorter lifespan.


Hyperthyroidism can often be cured. In fact, the majority of felines who undergo I-131 radioiodine treatment, which doesn't require anesthesia or subsequent pain management medications, can be cured within one treatment.

Have questions about radioiodine therapy for cats? Contact us today!

Signs of hyperthyroidism in cats

While cats are notorious for hiding symptoms, the signs of hyperthyroidism can often be blatant. Keep an eye out for the most common signs associated with hyperthyroidism:


  • Weight loss, despite a ravenous appetite
  • Hyperactivity
  • Excessive thirst or urination
  • Diarrhea and/or vomiting
  • Heart disease (such as tachycardia or hypertrophic changes)
  • Panting
  • Hypertension
  • Excessive shedding and matting of their fur
  • Palpable thyroid masses

It never hurts to be too careful. If you see any of these signs in your cat, please contact us as soon as possible to determine the next steps.

Refer an I-131 patient

We appreciate your referral. To let us know about a potential patient, please fill in the 1-131 referral form.

Does your pet need an I-131 consult?

Call Animal Emergency & Specialty Center of Chattanooga to schedule an appointment with our team of experts.


There are no words to describe how great Dr. Melissa Miller has been with our fur baby. She has truly gone above and beyond to treat our special boy. I will be forever grateful for her; she cares so much about her patients and their families. 

Lindsay B.

I had to bring my dog, LuLu, in tonight due to her getting hit by a car. The staff and vets were great with her and my emotional self. Thank y'all so much. LuLu is going to be great.

Jennifer S.