Hyperthyroidism is the most common hormonal disorder in older cats, causing significant welfare impacts if undetected. Effective treatment restores quality of life significantly.
Hyperthyroidism causes a sustained high-metabolism state that feels like chronic anxiety — elevated heart rate, hyperactivity, and the paradox of eating voraciously while losing weight. Many cats are presented to vets after months of these symptoms because owners attribute the changes to normal aging. Annual blood screening for cats over 10 years old is the most effective way to detect hyperthyroidism before serious complications develop. Treatment dramatically improves quality of life — treated cats show return of normal weight, coat condition, and temperament within weeks.