Central Sensitisation and Pain Amplification: A Framework to Guide Decision-Making

I use teaching the patients how to draw their pain to help find the underlying cause. The drawing tells a story, and listening to the story helps define the amplifiers for pain.

Central sensitisation is often spoken about as a diagnosis.

I don’t see it that way.

Instead, I see it as a decision-making framework.

Because central sensitisation isn’t the condition, it’s a neuroinflammatory process plus neurological changes amplifying pain.

Once you understand that, the clinical question changes.

It stops being:

“Is the patient sensitised?”

And becomes:

“Why is the patient sensitised or what’s amplifying the pain?”

Step One: Is the Nervous System Sensitised?

The first role of the framework is simple:

Is sensitisation present?

The nervous system has a limited set of ways it expresses distress. In the same way the lungs give you cough, wheeze, and shortness of breath, the central nervous system expresses dysfunction through patterns such as:

• Sensory hypersensitivity

• Sleep disturbance

• Mood disturbance

• Cognitive dysfunction

• Fatigue

• Dysautonomia

• Motor dysfunction

• Behavioural dysfunction

When these cluster together, particularly alongside disproportionate or widespread pain, the amplifier is turned up loud.

When or if you recognise these symptoms as an amplified or dysfunctional nervous system, the presentation starts to organise itself. Rather than a long list of unrelated symptoms, structure appears. You start to see the matrix.

Step Two: What’s causing the sensitisation?

Identifying sensitisation tells me the volume is up.

It does not tell me why.

The drivers are rarely singular. More often, they are cumulative:

• Psychological stress

• Social stress

• Physical injury

• Infective and Inflammatory disorders

• Metabolic and endocrine disease - Diabetes, hyperthyroidism, coeliac disease

• Organ dysfunction and disease

• Hypermobility

• Obesity

• Chemical and environmental stresses

That covers the most common, but the list is as long as your arm.

This is where the concept of allostatic load becomes helpful. It refers to the accumulated physiological response to stressors.

The body compensates remarkably well, until it can’t.

I often explain this using diabetes.

If someone has a genetic predisposition and a high-sugar diet, the body compensates. Insulin rises. Glucose is stored as fat. Fat accumulates.

But eventually, these mechanisms are overwhelmed, blood glucose rises persistently and we label it as diabetes.

Blood pressure is the same.

Intermittent increases in blood pressure to deal with acute stressors, prolonged rises resulting in hypertension, and long-term damage resulting in cardiovascular disease.

These metabolic changes drive a neuroinflammatory process that sensitises the nervous system. Pain is commonly the first thing that is amplified.

Maybe disproportionate or widespread pain is an alert telling us there’s a problem.

It’s my job to try and work out the problem.

That’s my approach. Everyone’s got their own approaches, interested to hear how you might sort through difficult presentations.