You can have leg and foot involvement from compressions arising from any cervical issues too.

Nerves from the lower torso hitch a ride on other nerve bundles and travel together to get to the spine and brain. This is why we have "referred pain"...

And there is this... Dr. Sarno has spent many years working with people who have various back issues.

http://en.wikipedia.org/wiki/John_E._Sarno

He believes that stress causes some people to tense up and this then reduces blood flow (by compression), to various body parts, which then react with a type of ischemic pain.

His book is quite interesting. He has been on 20/20 news show here and worked with thousands of people who improved. What I found interesting is that when he fixed their spinal issues, then they went on to develop IBS or GERD.... laterally transferring their tension to new systems!

The body is a complex soup of chemistry, and interrelated systems that is amazing. And until the newer high Tesla MRIs arrive for testing humans, some soft tissue issues just do not visualize at all. Our concussion posters here are waiting also for the newer MRIs, because then the brain damage might show up where now they don't in conventional MRIs.