I have many symptoms of hyperthyroidism myself that I am just beginning to deal with, thanks to the very caring people at Curezone.! But, yes, I also have a lot of leg weakness, and it's weird. My joints seems so stiff aruond the knees (but really overdone!) and the muscles in my thighs seems somewhat sore and weak. It is hard to climb stairs, I agree. So, if you and I both have that same symptom, and we're both dealing with hyperthyroidism, then maybe it's more typical than you think. Shelley advised me to get the Acid Defense from Garden of Life which I just ordered. It has all the minerals etc...you need to help a hyperthyroid situation.
So, don't feel discouraged! I'm sure others have this same symptoms as well. Keep us posted.