He is + for the HLBA27 gene factor? I am sorry .... if you go to the arthritis community the Community Leader is wonderful and has AS herself I believe. Between both boards we are here for you. Please be sure he has a good pedi rheumatolgogist and ped endocrinologist working with him .. there also is a ped endo community with a dr here at MedHelp.
C~
Some people gets headaches on certain thyroid medications (generic vs brand) but as for as really being harmful, it is not. It is replacing a hormone that the body needs and is not manufacturing properly. My daughter has been on Synthroid and Cytomel since she was eight. Two pills for the rest of her life.