Taking Thyroid Hormone Increases Breast Cancer Risk By 200%

A study found that women who take thyroid hormone for at least 15 years have 200% increase in the risk of breast cancer as compared to women who did not take thyroid hormone. You read that correctly: a 200% increase risk of breast cancer in women who took thyroid hormone as compared to women who did not take thyroid hormone. How could that be? The answer is simple: The increased breast risk in thyroid supplemented women is due to iodine deficiency.