Great question — these two terms can definitely feel confusing! They are actually distinct concepts, though they share some overlap.
PPMS (Primary Progressive MS) is a *type* of MS. It's defined by symptoms that worsen steadily from the very beginning, with no periods of relapse or remission. It affects about 10% of people Show Full Answer
Great question — these two terms can definitely feel confusing! They are actually distinct concepts, though they share some overlap.
PPMS (Primary Progressive MS) is a *type* of MS. It's defined by symptoms that worsen steadily from the very beginning, with no periods of relapse or remission. It affects about 10% of people with MS and tends to cause more motor (movement) problems than other forms.
PIRA (Progression Independent of Relapse Activity) is not a type of MS — it's a *pattern of progression* that can happen in *any* form of MS, including relapsing forms. It describes slow, silent worsening that occurs even when someone isn't having a relapse. Here's a simple way to think about the difference:
- PPMS = a diagnosis/subtype of MS where progression starts from day one
- PIRA = a process of slow, silent worsening that can happen across MS types, even when things seem stable
So while PPMS involves progression from the start, PIRA can quietly occur in the background regardless of which type of MS someone has. Timing is part of it, but the bigger distinction is that one is a *diagnosis* and the other is a *mechanism of progression*.
Talking to a neurologist about whether PIRA may be playing a role is always a worthwhile conversation.
April 26
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