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04

Pain processing

Pain is produced by the nervous system, not measured by it.

Skin and surfaceJointsDeep organsSpinal gateTurned up,or downThe gateOrgans
Signal inVolume dialThe gateOrgans

A schematic, not to scale — the places this mechanism works.

Part one — how this normally works

Nociception is not pain

Peripheral fibers report potential tissue threat. The spinal cord and brain weigh that input against context, expectation, sleep, mood and prior experience, then produce pain as an output. The two can dissociate in both directions.

Gain is adjustable by design

The cord amplifies input after injury so the area is protected while it heals, and descending pathways from the brainstem turn the gain back down afterwards. Temporary amplification is adaptive.

Referral is normal wiring

Visceral and somatic fibers converge on the same cord segments, which is why organ pain is felt in the back, hip or thigh, and why one irritated organ can make a whole region tender.

Part two — what varies between bodies

  • Descending inhibition varies between people and is measurably weaker after poor sleep.
  • Repeated or long-standing input makes amplification more likely to persist.
  • Threat, uncertainty and being disbelieved all measurably increase pain output.

Part three — where it diverges

This is the first place conditions get named

  • When amplification persists after the original driver is treated, pain spreads beyond the original site, and light touch or normal pressure becomes painful, that state is called central sensitization.
  • Widespread pain with fatigue, unrefreshing sleep and cognitive fog is described as fibromyalgia — a sensitization phenotype, not a diagnosis of exclusion.
  • Migraine involves the same gain machinery in the trigeminal system, with cutaneous allodynia as the visible marker.
  • This is the mechanism that explains why pain can be severe with unremarkable imaging — absence of findings is not absence of disease.

What moves this mechanism

  • Treat peripheral drivers and central gain at the same time, not in sequence.
  • Sleep as a pain intervention with real effect size.
  • Graded, predictable movement that updates the prediction rather than confirming threat.
  • Explaining the mechanism, which itself reduces pain in trials.

Conditions that involve this mechanism