During my DRX9000 treatments, I had sciatic pain return during the first 4 or 5 sessions. After 7 sessions the pain was less and then by 10 or 11 sessions it was gone. However, I still had foot pain which was not helped until the practitioner adjusted the machine settings to affect another disc area (L2 I believe). The new settings worked after another 10 sessions. His reasoning for the new settings was that my MRI results showed only L3 disc herniation because I was lying flat on my back during the MRI. He reasoned that my foot pain most likely was the result of L2 herniation which would possibly have shown up if I was scanned standing. (I don't know if that type of MRI is possible but, anyhow, his theory resulted in my complete recovery.)