HI, Customer (name blocked for privacy)
Not knowing anything else about him, I would say he as a pinched nerve in his lower back. Most likely at L5-S1 level. He needs to see a back specialist like an othropedic or neurosurgeon for this. He could be having a form of Sciatica.
Please see these links:
http://www.spinalneurosurgery.com/links.htm
http://www.spine-health.com/topics/topics01.html
If you have any other questions please feel free to ask me. Good Luck and God Bless.
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