Hi Nicky, That is what I found when I googled too. No one has actually sat down with me and explained all of this but over time ( and googling ) I have started to work out why there may be a delay for me being dx with MG. I do actually have the Graves antibodies as well as the Hashimotos antibodies ( low and high thyroid) but that can happen with 'simple' Hashimotos as well. And they are not terribly high... And my Addisons appears to be more Pituitary than autoimmune... no AD antibodies ever been found - but that is not conclusive either - as they are fairly transient. I seem to be caught in some type of twilight zone !