I asked my nurse practicineer about the possibility that the gabapetin was causing my muscle pain. She looked it up in her little computer and said it was about two percent so I guess something else must be going on here. Whatever it is I'm sure it's hereditary. My mother had this and my grandmother. I remember the ridicule my grandmother had to endure because they couldn't find the cause of her pain. I won't go on and on, but it was bad. Things haven't really changed that much.