I just want to share this site with you all. http://www.triggerpointmaps.com/tp_finder.html
It is about trigger points and referred pain. I have found it helpful to pinpoint where the problem is and how it affects other parts of my body, such as chest pains, arm and hand etc.
I look at this chart often, especially when I experience pain some where that scares me. There are also ways to treat these trigger points which are helpful.
Hope it helps someone else too!