The Two Sources of Pain: Pressure AND Chemistry
Think of your dorsal root ganglion (DRG)—the nerve’s control center—like a busy office building. When a disc herniates, two things happen simultaneously:
1. The Physical Problem (Mechanical) The herniated disc material physically squeezes the DRG, like someone stacking heavy boxes against the office door. This pressure:
- Cuts off blood supply (ischemia), starving the nerves of oxygen
- Causes swelling (edema), cramping the space even more
- Damages the nerve’s protective coating (demyelination), like stripping insulation off electrical wires
Any one of these physical problems alone can make nerves misfire and send pain signals.
2. The Chemical Problem (Why Surgery Doesn’t Always Fix Everything)
Here’s the critical discovery: researchers found that even when they applied disc material to nerves WITHOUT pressing on them—just touching the chemicals to the nerve—the nerves still became hyperactive and painful.
This is like discovering that it’s not just the weight of the boxes blocking your office door that’s the problem—the boxes are also leaking toxic fumes that make everyone sick even when you remove the weight.