Hi Ray,
As organic creatures...we often have the random, undexplainable pain here and there. Could be something as benign as a misfiring nerve...
If this is sparking anxiety for you, then here is a good link to check out. It explains how sensitized to these feelings we are when we have anxiety...getting into a cycle of symptoms=anxiety=more symptoms....
Tak a look. :)
Health Anxiety- The Super Scanner
http://www.get.gg/docs/SuperScanner.pdf
S.C.