Feline hyperthyroidism is the most common hormonal disease of senior cats and causes significant welfare impacts when undiagnosed; routine screening enables early treatment and excellent outcomes.
Early diagnosis of hyperthyroidism in cats is one of the highest-impact individual interventions available in companion animal welfare. The disease is highly treatable when caught early, but the insidious onset — gradual weight loss, appetite change, and restlessness that owners may attribute to normal aging — means many cats suffer for extended periods before diagnosis. Routine annual blood testing of senior cats dramatically improves detection rates and enables intervention before significant organ damage occurs.