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Hashimoto’s thyroiditis is an autoimmune condition that is the most common cause of hypothyroidism (underactive thyroid). The most common type of thyroid cancer is called papillary thyroid cancer (PTC). While there seems to be an association between Hashimoto’s and papillary thyroid cancer, it seems to be associated with a better prognosis. Patients who had Hashimoto’s thyroiditis and who were diagnosed with papillary thyroid cancer were less likely to have a recurrence of cancer on follow up, compared to those who did not have Hashimoto’s.
Hashimoto's thyroiditis may increase the risk of developing a rare type of cancer called thyroid non-Hodgkin's lymphoma. The good news is thyroid lymphoma is treatable and curable if it’s detected and treated promptly.
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Mona Sabra, MD. Is there a relationship between thyroid cancer and Hashimoto’s thyroiditis? 2018. American Thyroid Association. 27 December 2018