I have these flashes of pain that start in my wrist and travel up my arms. It's gone as soon as it starts, so it's not that terrible, just annoying. Does anyone know what this is? I hope I don't have a virus; it kind of feels like the pain you get when you're sick with the flu, but I don't (yet) have any other symptoms. Last night I had it too, but also in my ankle. It disappeared this morning, and now it's back...