Feline Hyperthyroidism is a disorder that occurs when the thyroid produces and excess of thyroid hormone.
Hyperthyroidism occurs in middle aged and older cats.
Both sexes and all breeds are equally at risk. The thyroid gland is butterfly-shaped and is located in the neck region. An excess of thyroid hormone affects all organ systems. Hyperthyroidism is caused by a tumor in the thyroid gland. Seventy percent of cats have both lobes affected.