Before that I was on synthroid for 6 years with again what seemed like normal thyroid levels but I still had meny of the symptoms of hypothyroid, fatigue, weakness, weight gain, increased difficulty losing
weight, coarse, dry hair, dry, rough pale skin, hair
loss and major cold intolerance. The letter stated that theres a small subsect of hypothyroid patiants that may seem to have normal thyroid levels but there body's and brain's are lacking a enzyme to handle synthroid.