from what i know, IF you're dx'd with MS your CNS will eventually be affected.
some people have sx's and some don't. but just because you don't have sx's doesn't mean the disease is stopping.

MS is a progressive disorder although every person's course is individualized.
that's why i personally believe that meds should be started early.
i've heard many docs say this.

however, there are people on the board who are not on meds. it's a personal choice.