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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 is a disorder in which the thyroid gland makes and releases more thyroid hormone than the body needs. Your doctor may say you have an  overactive thyroid  or refer to the condition as overactive thyroid disease..Your thyroid gland is located in the front of your neck.Hormones released by the thyroid affect nearly every part of your body from your brain to your skin and muscles. They play a crucial role in controlling how your body uses energy, a process called metabolism.he most common cause of hyperthyroidism is an autoimmune condition called Graves' disease. The body's immune system creates an antibody that causes the gland to make an excessive amount of thyroid hormone. Graves' disease runs in families and usually affects younger women.