I have seen a good deal of confusion about what exactly these sub types mean and what they are. How can one person who keeps getting worse be classified as RRMS, where someone with gaping black holes and are still walking are considered PPMS?

I was actually explained something amazing about this by a neurologist that clarified it very well for me.

These sub sets were all developed for clinical trials so a person could be placed appropriately based on how bad an individual was. It was all considered MS until the government said we need something more exact.

Now unfortunately because the government stuck it's nose in it is viewed different. Now rather than everyone with MS being treated, they get to divide folks up into groups.

I firmly believe it is why one neuro woul tell you I was RRMS, another would say I had SPMS, yet another would say I was PPMS from the onset.

To doctors it is MS.