Reviewed by Laura Martin on November 13, 2016

Sources "Thyroid Disease.", American Thyroid Association: "Thyroid Information," "General Information.", Mayo Clinic: "Hypothyroidism," "Hyperthyroidism.", U.S. Department of Health and Human Services: "What You Need to Know About Thyroid Cancer."; PhotoAlto/Alix Minde; Manchan; Medioimages/Photodisc; Medioimages/Photodisc; Thinkstock LLC; Blend Images/Ariel Skelley; Tom Grill; AudioJungle.

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