Harvard Health Blog

Is there a link between thyroid disease and breast cancer risk?

By: Mallika Marshall, M.D., Contributing Editor, Harvard Health Publications Breast cancer is the most commonly diagnosed cancer among women in the United States, and thyroid disorders affect millions of American women. Many breast cancers are sensitive to hormones like estrogen, and according to researchers, thyroid hormone has estrogen-like effects at high levels. So, for years, scientists have wondered whether having too much thyroid hormone might promote the development of breast cancer. A new study…

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