Radioactive iodine treatment offers a highly effective, single-treatment cure for feline hyperthyroidism with excellent welfare outcomes for appropriately selected candidates.
Radioactive iodine treatment represents the gold standard for feline hyperthyroidism welfare outcomes when the cat is a suitable candidate and owner constraints allow. The ability to achieve a cure from a single procedure eliminates the ongoing welfare burden of daily medication compliance — both the stress of repeated pilling and the risk of treatment gaps that allow thyroid hormone levels to fluctuate. The hospitalization period, while stressful for some cats, is a bounded event rather than a lifetime commitment. Post-treatment cats with normalized thyroid function show return to normal appetite, body condition, behavior, and cardiovascular health. For cats whose owners struggle with daily medication, or who have medication-related stress responses, radioactive iodine may deliver better welfare outcomes despite the short-term hospitalization.