As many as 27 million Americans suffer from some type of thyroid gland misfiring . Half do n't know it , endocrinologist group says . Score: 6 Hyperthyroidism is much more rare .
As many as 27 million Americans suffer from some type of thyroid gland misfiring . Half do n't know it , endocrinologist group says . Most sufferers have hypothyroidism , or underactive thyroid . Hyperthyroidism is much more rare .