Hyperthyroidism is the most common endocrine disorder in older cats, but effective treatments exist that can restore normal thyroid function and dramatically improve wellbeing.
Hyperthyroid cats suffer from the metabolic consequences of chronically elevated thyroid hormone including persistent hunger despite eating, restlessness and inability to settle, muscle wasting despite high food intake, and cardiovascular strain that causes hypertension and heart disease. The welfare burden accumulates over months before diagnosis in many cats. Early detection through routine senior health screening allows treatment before secondary organ damage occurs. The availability of curative radioactive iodine treatment means that most cats diagnosed with hyperthyroidism can be restored to normal health and wellbeing with a single intervention, making prompt diagnosis and treatment one of the highest-impact welfare opportunities in feline medicine.