Jim, CIDP is a rare, incurable autoimmune form of neuropathy. It’s a “cousin” disease to multiple sclerosis. It causes constant inflammation of the nerves. IVIG calms the inflammation and, if the patient is lucky, prevents further damage. But CIDP is a progressive disease and most people will get worse, either quickly or slowly. It’s also a relapsing/remitting disease. I’ve had two serious relapses in less than three years, at times when I had thought I was doing well. Increasing my IVIG dose pulled me out of relapse both times.