Hyperthyroidism is the most common endocrine disorder in older cats. Multiple treatment options exist with different welfare profiles, allowing individualized management.
Untreated hyperthyroidism causes significant chronic suffering - the hypermetabolic state creates persistent hunger, restlessness, and cardiovascular strain. However, the welfare profile of different treatments varies considerably. Daily oral medication causes chronic handling stress from twice-daily pilling for some cats. Radioactive iodine requires a short isolation period but is then curative with no ongoing treatment burden. The y/d diet is non-invasive but requires complete diet compliance that multi-cat households find difficult. The welfare-centered approach matches treatment to the individual cat's temperament, the owner's capabilities, and the cat's concurrent health status.