Thanks for all the responses - Wow, so this is really interesting. What is it about a low pressure system that causes pn to flare-up? I am 10x more achy, tingly, electric, heavy limb-feeling and just plain more tired than other comparable days that were sunny. I have NEVER before considered weather a factor in my symptoms but now I think I will pay more attention to it. But I am curious as to how it works...Does anyone know why and or how?