In the case of a herniated disc, the intervertebral disc itself does not usually move, but there is an escape of jelly mass from the nucleus, which can press on the spinal nerves. What are other types of back pain? When is a good time to see a physical therapist denver?SciaticaMany nerves move from the spinal cord to all areas of the body. The thickest and longest of them is called the sciatic nerve and extends from the lumbar area to the foot.