What could cause a burning pain in my thighs, and lower back and abdominal area, when i bend over too long?

Nerve pain?: Burning is a very common term used by patients with nerve-mediated pain. The cause may be from an irritated nerve root/spinal nerve in te back, or even perhaps a peripheral nerve. Given the symptoms are bilateral, likely from back. Would get formal evaluation by physician who specializes in pain or neurology to start the work up process.