Companion Animals

Cat Hyperthyroidism Radioactive Iodine Treatment

Radioactive iodine (I-131) therapy is the most effective curative treatment for feline hyperthyroidism.

Key Facts

Hyperthyroidism affects around 10% of cats over 10 years old
Radioactive iodine is the only cure and achieves remission in over 95% of cases
A single injection destroys overactive thyroid tissue with minimal side effects
Cats require a brief isolation period after treatment due to radiation safety
The treatment is widely available at specialist referral centres

Welfare Considerations

Untreated hyperthyroidism causes weight loss, hypertension, heart disease, and significant suffering. Radioactive iodine offers a permanent cure with excellent welfare outcomes for most affected cats.

What You Can Do

Discuss radioactive iodine therapy with your vet if your cat has hyperthyroidism
Understand that isolation is short - usually 7-14 days - and temporary
Monitor kidney function after treatment as it may become apparent post-cure
Pet insurance often covers the cost of I-131 treatment
Consider specialist referral centres with experience in feline nuclear medicine