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Hyperthyroidism is the most common feline endocrine disorder. In 98% of cases it is the result of benign adenomatous hyperplasia of one or both thyroid lobes and causes multi-systemic disease due to the excessive production of active thyroid hormone. The underlying aetiology of this condition remains unclear, but it predominantly affects middle aged to old cats with the average age of onset around 12-13 years. To date, there is no evidence to support a breed or sex predisposition. Major clinical features are those of polyphagia, weight loss, tachycardia (often with a murmur), PuPd, hyperactivity and intermittent GI signs. A palpable goitre may or may not be present.

Hyperthyroidism is the most common feline endocrine disorder. In 98% of cases it is the result of benign adenomatous hyperplasia of one or both thyroid lobes and causes multi-systemic disease due to the excessive production of active thyroid hormone. The underlying aetiology of this condition remains unclear, but it predominantly affects middle aged to old cats with the average age of onset around 12-13 years. To date, there is no evidence to support a breed or sex predisposition. Major clinical features are those of polyphagia, weight loss, tachycardia (often with a murmur), PuPd, hyperactivity and intermittent GI signs. A palpable goitre may or may not be present.