Definition: A type of multiple sclerosis (MS) that some people with relapsing-remitting MS develop. In secondary-progressive MS, a person shifts from having relapses to a continuous increase in symptom severity.
Secondary-Progressive Multiple Sclerosis
By Julie Stachowiak, Ph.D., About.com
Updated: April 30, 2007
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
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