In multiple sclerosis, or MS, your immune system attacks myelin, the fatty tissue that surrounds and protects nerve fibers. This causes scar tissue (sclerosis, also called plaque or lesions) to form ...
Most people with multiple sclerosis (MS) are diagnosed between age 20 and 50, though it can occur in children as well as in older adults, according to the National Multiple Sclerosis Society (NMSS).
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