Hyper Thyroidism
It is a state in which the thyroid gland releases more than the normal 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 and steady rate. In hyperthyroidism the processes are accelerated. In most cases the gland is either generally enlarged or contains many nodules of overactive thyroid tissue.
There are several possible causes of hyperthyroidism. They include:
- A defect of the immune system (autoimmune disease)
- Thyroid nodules develop containing abnormal thyroid tissue, causing the throid gland to over-produce thyroid hormones. It is unclear why they develop.
- Thyroid gland inflammation from excess iodine intake, radiation or virus infection
Graves’ disease is much the most common cause of hyperthyroidism. This disorder of the immune system is caused by abnormal antibodies that have a similar effect to the thyroid-stimulating hormone (TSH) which is created naturally in the pituitary gland. The result is over-production of thyroid hormones. |
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Other sources of information for these topics.
Hyperthyroidism: Signs, Symptoms, Diagnosis, Causes and Treatments ...
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