It's common for MGers to also have an autoimmune thyroid disease (Graves, Hashimotos).

I came down with Graves 18 years ago, after the birth of my daughter. I have been on and off methimazole and PTU ever since, with long periods between flare-ups. I never had any eye involvement.

I had my first noticeable MG symptoms a few months after a flare-up of the Graves, which I treated with methimazole. There seems to be some connection between methimazole and myasthenia gravis flare-ups. Google the two together for a few studies.

Meanwhile, I enjoy telling people that I have Graves disease and myasthenia gravis--it all sounds so, well, grave.

Abby