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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 condition in which there is a hypersecretion of the thyroid hormones. Our thyroid gland is responsible for producing these thyroid hormones. Our thyroid hormones are responsible for certain metabolic processes, such as hunger, temperature, and a lot more.Thyrotoxicosis, on the other hand, is a cause of hyperthyroidism.It is defined as too much thyroid hormones circulating in the blood which is more than those of hyperthyroidism. It is also called a thyroid storm, an emergency situation which may cause immediate death in the person having it.yperthyroidism and thyrotoxicosis are two endocrine related problems in our body. The endocrine system, as we all know, is responsible for the proper metabolism of chemicals in our body which have an effect on our overall well-being. Both of the said endocrine problems are different.