thanks for responding.i am having only 25 mcg of synthroid and my tsh is not too high. it was 4.5 and after the recent blood work its 2.25. my dr said he would like to see it in a lower range. but i am wondering whether i need that much now after reading your post. (mimicking hyperthyroidism). will discuss with my dr. i dont have any other symptoms other than joint pain.