There are new lesions. Also, once you have most if not all of the symptoms, old symptoms get worse. Also, there are more exacerbations/relapses with symptoms getting worse. There can be be remissions. Just not complete. It is like primary progressive it just started as exacerbating(relapsing)/remitting.

its a slow progression with no relief not big "attack " as when first got

Usually you move from RRMS TO SPMS. PPMS IS SEPARATE. I don't know exact criteria but was based on lesion activity and relapses and physical damage.

<-- secondary progressive in reality. On paper r/r to be able to get on meds. No new lesions. SLOW progression of symptoms.