Hi Sophia:

I have the recessive form of MC, with which it is not uncommon to have upper body weakness. Upper body weakness is a problem for me, and I do get pain in those muscles when cleaning, because my stamina in them is so poor and they will cramp from fatigue. I agree with Jan though, that what you describe sounds like it could be something other than MC, and you should see a doctor about it.

Type of Myotonia: Becker

Country: USA