Kim, Here is what I put in your other post.
Pain is not a PRIMARY symptom of MG but it is a SECONDARY symptom. When muscles get weak, they can cramp and spasm, just like they do in any athlete. In people with MG, they just do it a lot sooner. DUH!!!

I've had my entire trunk muscles go into spasm, which is a huge warning sign that your breathing muscles are about to tank. That was right before my myasthenic crisis.
It's "funny" how some doctors don't use logic but instead only go by what they have read - like that one page on MG in their medical books - and by their "algorithms." Maybe if they stopped to think about it, they might have an "ah ha" moment.
Annie