For me it travels all around. Any limb at any time. Right now my abs are twitching and there is slight weakness in my right tigh. But my weakness is just perceived. No keys dropping or trouble standing up or anything like that.
What I have noticed with my hands is that the big nerve (ulnar?) under the biceps hurts when I extend/strain the hand and put palm perpendicular to the arm (like Neo stopping the bullets if you know what I mean ). Also I had a few hour long pain inside my elbow. I think it must be connected to the nerve system but the EMG was perfectly fine according to the doctor.
Worst is that nobody takes me seriously any more. My GF says not to think about it, that I am hypochondriac, but it is kind of hard. But you know how it is....