09/22/2026
Did you know that approximately 1 in 10 cats over the age of 10 will develop hyperthyroidism?
Hyperthyroidism is the most common endocrine disorder in middle-aged and older cats. It occurs when the thyroid gland produces too much thyroid hormone, essentially putting the body into overdrive while stressing the heart and kidneys.
Common signs include:
• Weight loss despite a good—or even ravenous—appetite
• Increased thirst and urination
• Vomiting or diarrhea
• Restlessness, increased activity or vocalization
• Rapid heart rate
• An unkempt or poor-quality coat
Left untreated, hyperthyroidism is always fatal because it has serious effects on the heart, blood pressure, kidneys and overall health while drastically reducing quality of life.
The good news? Hyperthyroidism is one of the diseases we can cure without damaging other organs or requiring anesthesia.
At AtomicVet Veterinary Nuclear Therapy Center, we treat hyperthyroid cats with radioactive iodine (I-131), which is considered the gold standard treatment for hyperthyroidism in cats.
Approximately 97% of cats can be cured with a SINGLE I-131 treatment. I-131 works because abnormal thyroid tissue naturally absorbs iodine. A carefully calculated injection of radioactive iodine targets and destroys the overactive thyroid cells while largely sparing normal surrounding tissue.
For cats, that means:
✓ One injection
✓ No surgery or anesthesia (which often fails when the tissue migrates or grows back)
✓ No twice-daily thyroid medication for life
✓ No restrictive prescription diet for life
✓ A treatment that targets the abnormal thyroid tissue itself rather than simply attempting to control hormone levels temporarily.
If your cat has been diagnosed with hyperthyroidism, lifelong medication isn't your only option. Call us at 501-500-5220 to find out more, or ask your veterinarian. We are centrally located in Mountain Home, Arkansas and have successfully treated cats from all over the U.S. because we have an amazing facility, the most experienced staff, and we take care of our atomic cats like they're our own.