A comprehensive review of animal and human studies found that iodine deficiency is a risk factor for thyroid cancer with higher intakes of iodine being associated with a lower risk of thyroid cancer. (mindbodygreen.com)
This final study was conducted in Japan and found a 56 percent increased risk of thyroid cancer associated with an intake of more than 8.5 servings of cruciferous vegetables per week.14 This study ran contrary to the majority of those included, which found decreased risks. (westonaprice.org)
There is also a higher risk of thyroid cancer in children who have a family history of multiple endocrine neoplasia (MEN). (verywellhealth.com)