Companion Animal Welfare

Cat Welfare and Hyperthyroidism: Radioiodine Treatment

Radioactive iodine therapy is the gold standard curative treatment for feline hyperthyroidism. It eliminates the thyroid adenoma permanently without surgery or long-term medication.

Key Facts

Radioiodine therapy achieves cure in approximately 95% of treated cats with a single treatment
Cats require a period of hospitalisation following treatment until radiation levels fall to safe levels
Most cats can discontinue methimazole treatment after successful radioiodine therapy
Concurrent CKD must be assessed before radioiodine as treatment may reduce GFR
Radioiodine is available at specialist veterinary centres across the UK

Welfare Considerations

Radioiodine therapy offers the highest welfare outcome for most hyperthyroid cats by achieving permanent cure without lifelong daily medication. The temporary isolation required by radiation safety protocols is a welfare cost worth the long-term gain.

What You Can Do

Discuss radioiodine therapy with your vet as first-choice treatment for feline hyperthyroidism
Request specialist referral to a radioiodine centre if your cat is a suitable candidate
Ensure kidney function is assessed before committing to permanent thyroid ablation