An interesting article (2024 admittedly) caught my attention; A history of head injury along with HLA genes makes people upto 30% more likely to develop MS in later life.
Given my Chunk (Goonies reference) like listing of all the times I had concussion growing up (life long tomboy), and probably having HLA genes, it begins to make sense.
Don’t go looking for things that you done in your past as to why you have ms. I played in goals when i was younger and got more than my fair share of kicks to the head. Turns out my grand dad on my dad’s side had MS. He was dead before I was born. I was told that a parent or grand patent can increase your chances of getting MS.
What I am trying to say, although not very eloquently, even MS doctors don’t know 100% what the link/reason is etc. Just say “**** it!” And enjoy your life as much as possible whilst you are here cause you could get knocked down by a bus. Sounding like I have turned into my gran there
Good reply @PaulMcGaw 
I was an amateur boxer for years and,as I’m sure everyone knows, In that sport you get punched in the head alot. As far as I know, I’m the only one in my family to ever have MS.My consultant told me that it’s just bad luck 
Jon.
I had a number of falls and hit my head resulting in a concussion before I was diagnosed. I’ve no idea if this contributed to my having MS.
My sister has MS and my other two sisters also have auto immune conditions and I feel there is a genetic/hereditary influence.