As far as I know, one cannot fly if you have an overactive thyroid. Whether through surgery or radio iodine therapy should one's condition return to normal euthyroid condition I see no reason why one cannot fly. One will most likely be hypothyroidic after surgery or radio iodine therapy, so will be on thyroxin medication to maintain normal function.
Last edited by Raj Merlion; 5th Jul 2007 at 21:16.