The nervous system and persistent pain

One of the most common questions in our clinic is some form of: the scan is clear, so why does it still hurt? It is a fair question, and the answer changes what treatment should look like.

Pain is an output, not a reading

It is tempting to think of pain as a measurement of tissue damage — more damage, more pain. In practice the relationship is much looser. Pain is produced by the nervous system as a protective response, weighing signals from the tissues alongside context, memory, expectation and threat.

That is why a footballer can finish a match on a fractured metatarsal, and why a paper cut can be disproportionately unpleasant on a bad day. Neither is imagination. Both are the system doing its job with the information available.

What happens when pain persists

When pain continues past the point of healing, the nervous system has often become more efficient at producing it. The protective threshold drops. Movements that were once neutral start to register as threatening, and the system responds accordingly — earlier, and more strongly.

This is a learned pattern, and the important consequence is that learned patterns can change.

What this means for treatment

Three things follow.

Rest stops being the answer. Beyond the acute phase, avoiding movement tends to lower the threshold further. The tissue deconditions, the system becomes more protective, and the pain arrives sooner.

Load has to be graded, not avoided. The route back is gradual, tolerable exposure to the movements that have become threatening — enough to challenge the threshold, not enough to confirm the alarm.

Understanding is itself treatment. Patients who understand why their pain persists reliably do better. Not because the explanation is comforting, but because it changes what the movement means, and meaning is one of the inputs.

What we do in practice

Rehabilitation for persistent pain at Olivrae usually combines a graded loading programme with time spent on the reasoning behind it. Where the pain has become entangled with anxiety or low mood — as it very often does after months of it — we will suggest working alongside one of our mental health therapists.

That is not a suggestion that the pain is psychological. It is a recognition that the system producing it does not respect the boundary between physical and psychological in the way our services traditionally have.