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Causes of Thyroid, over-active

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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