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TM is said to be caused as a reaction to a virus (my case) as a response to vaccination or can just occur for no good reason.
In my case, I have had two lots of major brain surgery, the most recent being November 16. I became ill in early Feb 17, could it be that my body was weak following surgery? My immune system low? I just don't know but I developed a nasty virus which the doctors say attacked my central nervous system and from there TM developed.