Hyperthyroidism is the most common hormonal disorder in older cats, causing weight loss, anxiety, cardiac problems, and reduced quality of life when untreated.
Hyperthyroid cats experience chronic metabolic disturbance causing weight loss despite increased appetite, anxiety and restlessness, weakness, and cardiovascular strain. The condition is progressive and fatal if untreated. Early detection and treatment with radioactive iodine — the gold standard — restores normal function and significantly extends healthy life expectancy.