VIDEO: Family history only known risk factor for thyroid cancer

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Only known and agreed upon risk factors are family history, and so for differentiated thyroid cancer it's only about 5% that are familial, where there's more than one first-degree relative that has it and risk is more likely that it's familial if there's multiple first-degree relatives. For medullary thyroid cancer it's known to be associated with MEN2, and that is familial so everyone with medullary thyroid cancer should be screened for that. So family history is one, and then the other risk factor that's agreed upon is radiation exposure. And so again, this is for differentiated thyroid cancer. This wouldn't be things like X-rays, this would be things like exposure to Chernobyl or potentially treatment with radiation for childhood head and neck cancer.