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The course of multiple sclerosis (MS) is
unpredictable. The disease minimally affects some people while others experience a rapid progression
to total disability. Most MS patients fit between these two extremes. Although every
individual will experience a different combination of MS symptoms, there are a number of
distinct patterns relating to the course of the disease.
Relapsing-remitting
multiple sclerosis:
Relapsing-remitting MS is the most common form of
MS and typically occurs in young people. In this form of MS there are
unpredictable relapses (exacerbations or attacks) during which new symptoms appear or
existing symptoms become more severe. This can last for from days to months and there is
partial or total recovery. The disease may be inactive for months or years.
Approximately 85% of patients diagnosed with MS have relapsing-remitting multiple sclerosis.
Benign multiple
sclerosis:
After one or two attacks with complete
recovery, this form of MS does not worsen with time and there is no permanent disability.
Benign MS can only be identified when there is minimal disability ten to fifteen years
after onset and initially would have been categorized as relapsing-remitting MS. Benign MS
tends to be associated with less severe symptoms at onset, for example, sensory. Between 20%
and 30% of patients diagnosed with MS have benign multiple sclerosis.
Primary progressive
multiple sclerosis:
This form of MS is characterized by a
lack of distinct attacks, but with slow onset and steadily worsening symptoms. There is an
accumulation of deficits and disability that may level off at some point or continue over
months and years. Approximately 10% of patients diagnosed with MS have primary progressive multiple sclerosis.
Secondary progressive multiple sclerosis:
For some individuals who initially have
relapsing-remitting MS, there is the development of progressive disability (i.e., nerve and muscle deterioration) later in the
course of the disease often with superimposed relapses. Approximately 40% of patients diagnosed with MS have
secondary progressive multiple sclerosis. Most patients suffer relapsing-remitting MS before it progresses to secondary progressive MS.
Progressive relapsing multiple sclerosis:
This is a rare form of MS in which the disease is progressive from its initial onset. Symptom
flare-ups occur and deterioration continues in between relapses. Approximately 5% of patients diagnosed with MS have progressive relapsing multiple sclerosis.
Updated: September 18, 2007
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