Hyperthyroidism is the most common endocrine disorder in older cats, and untreated, it causes significant suffering — yet it is highly treatable when diagnosed early.
Cats with unmanaged hyperthyroidism experience a state of chronic physiological stress — their bodies are driven into overdrive. Owners often misinterpret weight loss and increased appetite as normal aging or improved appetite rather than illness. The welfare gap between well-managed and neglected hyperthyroidism is enormous: treated cats return to normal weight and behavior, while untreated cats deteriorate progressively. Regular senior wellness screening enables early detection.