According to the American Medical Women's Association, an estimated 13 million Americans have thyroid disorders, and more than half of them remain undiagnosed. Women are 5 to 8 times more likely than men to suffer from an overactive or underactive thyroid. This Thyroid chart illustrates the thyroid gland and explains its role in the body. Shows normal hormone production and how to check your thyroid. Provides diagrams, descriptions and symptoms of having an overactive thyroid, underactive thyroid, thyroid nodules and cancer. Also provides description of common diseases under these types of thyroid disorders. Thyroid poster size is 20" W by 26" H and laminated.