Early on in my disease I was eager to pinpoint the cause and was told by more than one neuro that it didn't matter since there is no cure. They said we have done the testing to rule out everything and yours is idiopathic. They dismissed my alcohol use (which I learned was not excessive), my vegan lifestyle and vaccines. By the way, I also had a pneumonia and tetanus vaccine simultaneously prior to the time that I acquired the PN. No matter what I said or how much I speculated, it was met with the same reply: that we will never know and it doesn't matter because there is no cure.