Hyperthyroidism is the most common endocrine disorder in older cats, causing weight loss, hyperactivity, and cardiovascular complications. Early diagnosis and treatment preserve quality of life.
Hyperthyroid cats experience a state of physiological overdrive — chronically elevated heart rate, blood pressure, and metabolic rate cause them to feel perpetually agitated and hungry while progressively losing body mass. Secondary hypertrophic cardiomyopathy threatens cardiac function. The welfare implications are significant: this is a condition of chronic distress that is both common and highly treatable. The welfare-conscious owner monitors weight, appetite, and behaviour in older cats and pursues early diagnosis through blood testing. Effective treatment restores quality of life dramatically, often resulting in a calmer and healthier cat.