Central Sensitization: When the Pain System Gets Stuck
Part 3A · Section 3: Chronic Pain Mechanisms
Central Sensitization: When the Pain System Gets Stuck
In central sensitization, the nervous system has learned to be hypersensitive — producing pain that outlasts any tissue injury and responds to stimuli that should not hurt at all.
Central sensitization is one of the most important concepts in modern pain science — and one of the most poorly communicated to patients. Understanding it is essential for understanding chronic pain, and for understanding why manual therapy works through neurological mechanisms, not mechanical ones.
What Central Sensitization Is
Central sensitization is a state of enhanced responsiveness in the central nervous system — the spinal cord and brain — in which pain processing becomes amplified. The nervous system's gain is turned up. Key features include:
- Allodynia — pain from stimuli that are normally non-painful (light touch, temperature changes)
- Hyperalgesia — exaggerated pain response to normally painful stimuli
- Widespread pain — pain that extends beyond the original site of injury
- Temporal summation — repeated mild stimuli produce progressively greater pain responses
How Central Sensitization Develops
Persistent nociceptive input from tissue injury or inflammation drives molecular changes in dorsal horn neurons — particularly NMDA receptor activation, synaptic strengthening, and loss of inhibitory interneuron function. The result is a spinal cord that amplifies rather than modulates incoming pain signals.
Once established, central sensitization can persist independently of the original injury. The tissue heals; the sensitized nervous system does not spontaneously reset. This is why so many people with chronic pain are told their scans look normal — the problem is no longer in the tissue. It is in how the nervous system processes signals from that tissue.
Central sensitization is not a psychological phenomenon. It is a measurable neurobiological state — and it responds to neurobiologically targeted interventions.
Why This Matters for Treatment
A 2024 randomized controlled trial found that spinal manipulation was associated with significant reductions in segmental mechanical hyperalgesia — a direct marker of central sensitization — in chronic low back pain patients. This suggests that manual therapy may genuinely recalibrate nervous system sensitivity, not merely mask pain temporarily.
Key Takeaways
- Central sensitization is amplified pain processing in the CNS — not a psychological phenomenon
- It can persist independently of tissue injury — normal scans do not mean no pain
- Features include allodynia, hyperalgesia, widespread pain, and temporal summation
- Manual therapy combined with pain neuroscience education can reduce central sensitization markers
Gevers-Montoro C, et al. Reduction of chronic primary low back pain by SMT. J Pain. 2024.
Todd AJ. Neuronal circuitry for pain processing in the dorsal horn. Front Pain Res. 2022;3:845211.
CALee Acupuncture — Hoon Lee, L.Ac., DAOM(c)
Buena Park, CA · Korean Therapeutic Bodywork · Acupuncture · Pain Management
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