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MS is a rare condition, affecting about one in every 11110 people globally.
More people tend to have MS in colder regions - further from the equator, though there are also other complicating factors. 
Genetically, MS is complex, as over 200 genes have been associated with MS risk.
Heritability means how much of the differences in a trait (like height) within a group of people can be attributed to differences in genetics.
Something like eye colour has very high heritability (>80%), which means it’s almost completely determined by genetics. Something like a person’s first language has 0% heritability - as that’s entirely to do with their environment.
What it doesn’t mean is how likely something is to be inherited from a parent , as even if a condition had 100% heritability, and so was completely down to genetics, it might be associated with a dominant or recessive gene, or more likely associated with many many genes, which interact in complex ways and which are still being explored & discovered!
Symptoms vary between people, and can change over time. 
Many autoimmune conditions impact more women than men - in the case of MS about 2 to 3 times more women than men have the condition. 
More than 85% of people with MS experience periods of relapse (worsening symptoms) and remission (improving symptoms) after their diagnosis.
These are the best resources we've found so far on managing and learning about MS. Please let us know if you have other and we'll add them to the list!
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