I've had some recent muscle twitches (since October of last year) that I suspect at this point to be BFS instead of something more alarming (though I am working with my primary care physician). However, for a time I was quite worried about ALS. However, it's over 5 months now, and no weakness at all, just occasional twitching that comes and goes, I have full control of movement, it stops when I am exercising, etc., so I am less concerned about this than I was originally.

Previously after hurting my shoulder and neck, I had some TENS unit therapy via a therapist (this would have been June/July last year). I also have my own TENS-based unit I use occasionally (a few times a year...maybe 6 total) for relaxation (and if I'm being honest, sometimes stimulation, always below the waist).

There is no direct time correlation between the twitching and the TENS usage; in other words, it didn't start right after a session of this or anything. I just want to make sure there's no risk of TENS electrotherapy being a cause of neurodegenerative diseases such as ALS or MS. I saw one fairly fringe person (see http://sammilham.com/Amyoptrophic%20lateral%20sclerosis%20(Lou%20Gehrig's%20disease)%20and%20electric%20currents.pdf) propose TENS therapy in athletes as a possible cause of the higher number of cases of ALS in athletic people, but I haven't seen this suggested by anyone else, and he doesn't really use any data - it's just a hypothesis. I want to make sure this isn't a risk factor of something down the line.

Thanks much!