Hi Paula,
I haven't experienced that myself, but I wouldn't be surprised if it was caused by mtx as it's such a strong drug isn't it.
My friend had the same problem when she was warfarin, the meds are so strong arnt they.
I know thyroid conditions can also cause hair loss. I have an under active thyroid, I've found on here that that a lot of us with RA have thyroid problems as well.
Sorry I couldn't be of more help.
Take care
Lou xx
I love people who can make you smile even when you do not feel like smiling. x