Hulda Clark had a persistent eye twitch from a fluke that would never leave there. Then she tried the Best Zapper zappicator on it to see if it worked and she retested herself after one treatment and the fluke was gone. So parasites can definitely cause twitching. I think they twitch more around the full moon because they are coming out to mate or something. Yes it can be magnesium deficiency, yes it can be neurological, and yes it can be parasitic.