Multiple sclerosis (MS) is an autoimmune condition, which causes your immune system to mistakenly attack healthy cells instead of unhealthy cells.
With MS, your immune system damages the protective protein coating that insulates your nerve fibers, called myelin, in your brain, spinal cord and optic nerve.
These areas of your nervous system control everything from your cognitive ability to vision, body sensations and mobility. Multiple sclerosis affects around 1 in 300 people in the United States, and it can affect everyone differently.
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