Just had my own bout with this. My BP has always run in the ideal range, but today, I went to my PCP for a normal checkup, and it was 70/50! After several people in the office took it over again, they sent me straight to the hospital to get it checked out. The hospital determined that all my tests looked normal and released me with no explanation.

So who knows why? Nobody said anything about MS causing it, but you have to wonder. If it can affect other autonomic functions, why not this?