In every form of MS, the immune system attacks nerve cells in the CNS, which can cause symptoms and disability.
Both RRMS and PPMS are marked by worsening signs or symptoms at some point during the course of the disease.
Symptoms are similar across all forms of MS, but differ for each person, no matter which form.
Most people with RRMS and PPMS experience an increase in physical disability at some point in time.
Both man and woman can be diagnosed with RRMS and PPMS.
Disease activity may be outwardly apparent with new or worsening signs or symptoms, or underlying, such as lesions (inflamed or damaged areas of the central nervous system) that are detected with special equipment like magnetic resonance imaging (MRI).10
An important goal of treating RRMS and PPMS is to slow the progression of disability as early as possible.
National Multiple Sclerosis Society. Types of MS. Available at
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Lublin F.D. et al. (2014). Defining the clinical course of multiple sclerosis. Neurology, 83(3):278-86.
MS Society. Primary Progressive (PPMS). Available at
Holland NJ, Schneider DM, Rapp R, Kalb RC. Meeting the Needs of People with Primary Progressive Multiple Sclerosis, Their Families, and the Health-Care Community. International Journal of MS Care. 2011;13(2):65-74.
Planche V., Gibelin M., Cregut D., Pereira B., Clavelou P. Cognitive impairment in a population-based study of patients with multiple sclerosis: differences between late relapsing-remitting, secondary progressive and primary progressive multiple sclerosis. Eur J Neurol. 2016;23(2):282-289.
Kobelt, Gisela, et al. (2017). New insights into the burden and costs of multiple sclerosis in Europe. Multiple Sclerosis Journal, 23(8):1123–1136. Available at:
Multiple Sclerosis International Federation. What is MS? Available at
Multiple Sclerosis International Federation. (2013). Atlas of MS 2013. Available at:
Erbayat A, et al. (2013). Reliability of classifying multiple sclerosis disease activity using magnetic resonance imaging in a multiple sclerosis clinic. JAMA Neurol, 70(3):338-44.
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