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What is hyperthyroidism? Hyperthyroidism is a very common disease afflicting primarily middle-aged and older cats. Also called thyrotoxicosis, hyperthyroidism is caused by an increase in production of thyroid hormones (known as T3 and T4) from enlarged thyroid glands in the cat's neck. In most cases, enlargement of thyroid glands is caused by a tumor called an adenoma, which is non-cancerous.
Hyperthyroidism occurs when the thyroid gland malfunctions and produces too much thyroid hormone. This condition is also known as overactive thyroid or thyrotoxicosis. An abnormal enlargement of the thyroid (goiter) develops in certain forms of hyperthyroidism. The thyroid gland is located in the anterior area of the neck and uses iodine atoms to produce two hormones, triiodothyronine (T3) and thyroxine (T4). T4 is produced and then converted to T3, the more active form of thyroid hormone.