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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, also known as overactive thyroid, is a medical condition caused by an abnormally high level of thyroid hormone in the bloodstream. The thyroid gland produces an excessive amount of thyroid hormones.raves' disease is an autoimmune condition in which the body's immune system mistakenly targets the thyroid gland and causes it to produce too much thyroid hormone. It is unclear what triggers this condition. There is a genetic basis for Graves' disease, meaning that it can run in families.