Hyperthyroidism is the most common endocrine disease of older cats and causes significant suffering if undiagnosed or poorly managed.
Untreated hyperthyroidism causes progressive cardiovascular disease, hypertension, weight loss, and significant discomfort. The condition is very treatable and a diagnosis-to-treatment pathway can restore excellent quality of life. Owner awareness of signs in older cats and access to effective treatment is key to preventing prolonged suffering.