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Thyroid, over-active

Hyperthyroidism is also called thyrotoxicosis. It is the state in which the thyroid gland releases more than the usual amount of thyroid hormones into the blood stream.

The two thyroid hormones, thyroxine and tri-iodo-thyronine, act on all the cells in the body that are consuming energy, to speed up the processes of fuel consumption. Normally, the amount of thyroid hormone in the blood is carefully controlled so that these processes occur at a correct rate. In hyperthyroidism the processes are accelerated. In most cases the gland is either generally enlarged or contains many nodules of overactive thyroid tissue.

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