When an intervertebral disc is damaged and loses its ability to contain high pressure, vascular sprouts and nerves can grow into it, increasing pain sensitivity.

“nerves all the way through and the reason reason is a healthy virgin disc doesn't have any vascular tissues going into it nor does it have any nerves um when you and the reason is when you squeeze a disc you build up tremendous intradiscal pressure that kills any kind of vascular sprouts or neural sprouts it's a healthy environment containing the pressure when you damage the disc and you lose the ability to contain the high pressure now all of a sudden vascular sprouts grow in and so do nerves so it's so unfair you damage the disc and now the body grows a hardware more nerves to feel pain even more”