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Causes. Nodules can be caused by a simple overgrowth of normal thyroid tissue, fluid-filled cysts, inflammation (thyroiditis), or a tumor (either benign or cancerous). Most nodules were surgically removed until the 1980s.
The most common cause of hypothyroidism is Hashimoto's thyroiditis. Thyroiditis is an inflammation of the thyroid gland. Hashimoto's thyroiditis is an autoimmune disorder. With Hashimotoâs, your body produces antibodies that attack and destroy the thyroid gland.Thyroiditis may also be caused by a viral infection.Other causes of hypothyroidism include: Radiation therapy to the neck area.Treating certain cancers, such as lymphoma, requires radiation to the neck.ith Hashimotoâs, your body produces antibodies that attack and destroy the thyroid gland. Thyroiditis may also be caused by a viral infection. Other causes of hypothyroidism include: Radiation therapy to the neck area.