This can happen in any part of the body when the nervous system has been over stimulated. Normally it is purely one of nuerous symptoms of anxiety but it is always best to have it checked out by the doc to rule out any other conditions that can cause this.
Just a little FYI, roxy..........sometimes it's best if you check out the archives to see if your question has already been addressed here. Yours has and I've included the link. If you have further questions, just post on that thread which will bring it to the top again.
Thanks
Greenlydia
http://www.medhelp.org/posts/Anxiety/Buzzing-in-legs-feet/show/5212