Thyroiditis is an inflammation of the thyroid.  It causes thyroid hormone to leak out of the thyroid gland. This leakage causes hormone levels in the blood to go up, damaging the thyroid cells.

There are different types of thyroiditis:

  • Subacute thyroiditis. Involves painful inflammation and enlargement of the thyroid. The cause is unknown but possibly a viral or bacterial infection. The condition usually goes away on its own in a few months.
  • Postpartum thyroiditis. Develops after a woman gives birth.
  • Silent thyroiditis. Painless, enlargement of the thyroid. It is probably an autoimmune condition and sometimes develops into permanent hypothyroidism.'
  • Riedel's thyroiditis. A rare form of autoimmune thyroiditis where the normal thyroid tissue is replaced by fibrous tissue.


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