Hi Sarah_Kate... I also was getting muscle twitches in my left hand for about 4-5 months. First just in a finger and then the whole hand started. I would just sit there and watch it twitch and couldn't figure out why it was happening. And then, one day, they stopped... for now.
I don't think they are related to AS, but not sure... I concur that you should warm up the muscles and stretch a bit to see if they decrease in frequency and intensity... I hope you feel better soon!
