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Multiple Sclerosis

Primary Progressive Multiple Sclerosis: What Is It?

Lauren Smith, MAMandy Armitage, MD
Written by Lauren Smith, MA | Reviewed by Mandy Armitage, MD
Updated on April 8, 2025
Featuring Michelle Fabian, MDReviewed by Mandy Armitage, MD | April 8, 2025

Multiple sclerosis is an autoimmune disease that attacks the central nervous system. The two most common types include primary progressive MS and relapsing-remitting MS. Both types of MS occur when the immune system begins attacking parts of the central nervous system.

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Lauren Smith, MA
Written by:
Lauren Smith, MA
Lauren Smith, MA, has worked in health journalism since 2017. Before joining GoodRx, she was the senior health editor and writer for HealthiNation.
Mandy Armitage, MD
Reviewed by:
Mandy Armitage, MD
Mandy Armitage, MD, has combined clinical medicine with her passion for education and content development for many years. She served as medical director for the health technology companies HealthLoop (now Get Well) and Doximity.

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