This is a great forum and would be even better if the following article was read and studied:
http://emedicine.medscape.com/article/1172965-overview
CIDP is an autoimmune disease. In CIDP, IgG is transcribed incorrectly by DNA/RNA and communicates incorrect activations of B and T cells to attack motor nerves. Of course, it is much more complex, however, the article answers the basic questions that I often times see here.
Hope that helps