I don't think Joseph would mind me answering this - I imagine he is quite busy. MS, or multiple sclerosis, is "a chronic, slowly progressive disease of the central nervous system characterized by development of disseminated demyelinated glial patches called plaques;" according to Taber's. In plainer language, the nerves are slowly losing their ability to conduct impulses. The result of this is that one can no longer 'tell' their muscles to do the things they have been taught to do since we were babies. One of the first major loses is walking, it requires a lot of muscles, thus nerve impulses. According to the book, the cause is unknown & no specific therapy. Although, lately I have heard that massage may provide some small measure of relief from the symptoms.