Feline hyperthyroidism is one of the most common disorders in cats over 10 years old, with several treatment options that have different welfare implications.
Feline hyperthyroidism is a highly treatable condition, but untreated cases cause significant suffering from weight loss, hypertension, cardiac consequences, and metabolic disruption. Treatment choice should consider the individual cat's welfare - some cats experience significant stress from daily medication administration, while radioactive iodine requires hospitalisation. The optimal treatment balances efficacy, welfare during treatment, and owner capacity for ongoing management. Regular monitoring after treatment is essential as post-treatment hypothyroidism and the unmasking of underlying kidney disease both require management.