Observational study finds chronic back pain activates the default mode network — Evidence Review
Published in British Journal of Anaesthesia, by researchers from UC San Diego School of Medicine
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Table of Contents
People with chronic low back pain experience pain flares that activate the brain's default mode network (DMN)—a region linked to self-reflection and personal identity—rather than the typical pain-processing networks. Related research broadly supports this finding, indicating chronic pain disrupts or reconfigures DMN activity, integrating pain into emotional and cognitive aspects of the self, as shown in recent work from UC San Diego School of Medicine.
- Several studies demonstrate abnormal DMN function or connectivity in chronic pain patients, supporting the idea that chronic pain involves brain networks beyond those activated by acute pain and is associated with cognitive and emotional changes 1 2 5.
- Chronic pain is consistently linked with decreased DMN deactivation during tasks and altered DMN connectivity, particularly involving the medial prefrontal cortex and insular cortex, which are tied to pain rumination and maladaptive pain processing 1 2 3 4.
- Evidence suggests that the transition from acute to chronic pain involves not only peripheral and spinal mechanisms but also maladaptive reorganization of brain circuits, including the DMN, which may underlie persistent pain and its integration into personal experience 6 7 11.
Study Overview and Key Findings
Chronic low back pain is a leading cause of disability worldwide, and many patients report that simple movements can trigger intense pain flares. Despite the central role the brain plays in pain perception, the specific neural mechanisms behind movement-triggered pain in chronic low back pain (cLBP) have remained unclear. This new study is significant because it uncovers a surprising link between these pain flares and the brain’s default mode network (DMN)—a system typically involved in self-reflection and identity—suggesting that chronic pain may become integrated into one’s sense of self. This insight may help explain why standard pain treatments often fail and highlights the need for new therapeutic strategies.
| Property | Value |
|---|---|
| Study Year | 2026 |
| Organization | UC San Diego School of Medicine |
| Journal Name | British Journal of Anaesthesia |
| Authors | Fadel Zeidan |
| Population | Patients with chronic low back pain |
| Sample Size | n=114 |
| Methods | Observational Study |
| Outcome | Brain activity patterns during pain triggered by movement |
| Results | Chronic back pain activates the DMN, unlike acute pain. |
Literature Review: Related Studies
To situate these findings within the broader research landscape, we searched the Consensus paper database, which covers over 200 million research papers. The following search queries were used to find relevant studies:
- chronic back pain DMN activation
- acute pain versus chronic pain
- personal perception chronic pain mechanisms
Below, we summarize key topics and findings from related studies:
| Topic | Key Findings |
|---|---|
| How does chronic pain alter the brain’s default mode network (DMN)? | - Chronic pain disrupts or alters DMN connectivity and function, leading to reduced DMN deactivation during tasks and abnormal communication with other brain regions such as the insula and prefrontal cortex 1 2 3 4 5. - The degree of DMN disruption or reorganization often corresponds to the intensity and duration of chronic pain, as well as associated symptoms like rumination 2 4. |
| What distinguishes brain processing of acute versus chronic pain? | - Acute pain typically deactivates the DMN and activates sensory and attentional circuits, while chronic pain involves sustained DMN engagement and recruitment of emotional/cognitive brain regions 1 3 6 11. - Chronic pain is more likely to involve brain regions associated with self-referential thought, emotion, and memory, unlike acute pain 6 11 12. |
| How does chronic pain integrate with personal identity and self-perception? | - DMN connectivity in chronic pain is linked with pain rumination and the integration of pain into self-identity, potentially making pain more persistent and resistant to treatment 4 12. - Patients with chronic pain often exhibit altered interoceptive abilities and heightened focus on internal sensations, which may reinforce the personal experience of pain 14. |
| What are the implications for treatment and reversibility of chronic pain brain changes? | - Mind-body therapies and interventions targeting cognitive and emotional aspects of pain may help restore more typical DMN function and reduce pain burden 12 15. - The potential for brain circuit plasticity suggests that some neural changes in chronic pain may be reversible with targeted therapies, but further research is needed 10 15. |
How does chronic pain alter the brain’s default mode network (DMN)?
Research consistently shows that chronic pain is associated with significant disruptions in the DMN, including abnormal connectivity and a failure to deactivate during tasks that normally suppress DMN activity. The new UC San Diego study extends this understanding by demonstrating that movement-triggered pain flares in cLBP patients actively engage the DMN, highlighting a possible mechanism by which pain becomes woven into self-related brain processes.
- Chronic back pain patients display reduced DMN deactivation and abnormal DMN connectivity compared to healthy controls 1 2 5.
- Increased connectivity between the DMN and regions such as the insular cortex is correlated with pain intensity and duration 2 3.
- Enhanced functional connectivity in the medial prefrontal cortex—a DMN hub—is associated with pain rumination and emotional distress 4.
- The degree of DMN disruption may underlie cognitive and behavioral impairments observed in chronic pain patients 1 2.
What distinguishes brain processing of acute versus chronic pain?
Several studies differentiate the neural signatures of acute and chronic pain. Whereas acute pain typically results in DMN deactivation and engages sensory-discriminative brain areas, chronic pain leads to persistent engagement of the DMN and greater involvement of brain regions tied to emotion, memory, and self-reflection. The recent study adds direct evidence that movement-induced chronic pain activates the DMN, in contrast to acute pain stimuli.
- Acute pain causes the DMN to deactivate, redirecting cognitive resources to external threats 1 3 6.
- Chronic pain is associated with sustained DMN activation and increased connectivity with emotional/cognitive regions 1 2 11.
- Emotional and cognitive components distinguish chronic from acute pain experience 11 12.
- Chronic pain’s engagement of the DMN may contribute to its persistence and resistance to traditional treatments 1 11.
How does chronic pain integrate with personal identity and self-perception?
The link between chronic pain and self-related brain processes has been supported by studies showing that DMN connectivity is associated with pain rumination and altered self-perception. The new study’s finding that pain flares activate the DMN aligns with this literature, reinforcing the idea that chronic pain becomes intertwined with personal identity.
- Enhanced medial prefrontal-DMN connectivity in chronic pain correlates with pain rumination 4.
- Chronic pain patients report greater attention to internal bodily sensations but have reduced accuracy in detecting those signals 14.
- The integration of pain into self-perception may help explain difficulties in treating chronic pain and its impact on quality of life 4 12.
- These findings support therapeutic strategies that target cognitive and emotional aspects of pain, not just sensory symptoms 12.
What are the implications for treatment and reversibility of chronic pain brain changes?
Given evidence for maladaptive plasticity in chronic pain, some studies suggest that interventions targeting the DMN or broader brain circuits could potentially restore more typical function and reduce pain. The new findings encourage exploration of mind-body therapies and novel interventions like psychedelic compounds, which may help decouple pain from self-identity.
- Mind-body therapies such as meditation and cognitive behavioral therapy may help modulate DMN activity and improve pain outcomes 12 15.
- Brain circuit changes in chronic pain may be partially reversible with targeted interventions 10 15.
- New treatments may need to address both the sensory and self-referential aspects of pain for maximal efficacy 12 15.
- Ongoing research is required to determine the mechanisms and effectiveness of these approaches 10 15.
Future Research Questions
Despite advances, many questions remain about the mechanisms and optimal treatment of chronic pain involving the DMN. Further research is needed to clarify causality, reversibility, and therapeutic strategies.
| Research Question | Relevance |
|---|---|
| Can modulation of the default mode network reduce chronic pain symptoms? | Determining whether targeted interventions (e.g., mindfulness, neurofeedback, psychedelics) that modulate DMN activity can reduce pain flares in chronic pain patients is crucial for developing new therapies 10 12 15. |
| How does the transition from acute to chronic pain alter DMN connectivity? | Understanding the timeline and mechanisms of DMN changes could identify at-risk individuals and inform early intervention strategies 6 7 8. |
| Are DMN changes in chronic pain reversible with treatment? | Clarifying whether brain network alterations are reversible is essential for prognosis and the design of interventions that seek to restore typical brain function 10 12 15. |
| What is the role of interoception in the maintenance of chronic pain? | Since chronic pain patients show altered interoceptive accuracy and sensibility, investigating this further could reveal new pathways for intervention and deepen understanding of the pain-self link 14. |
| How do different chronic pain conditions affect DMN dynamics? | Comparing DMN changes across pain types (back pain, fibromyalgia, arthritis) could clarify whether findings are generalizable or condition-specific, aiding tailored treatments 2 3 4. |
This article provides a comprehensive overview of new and related research on the brain mechanisms underlying chronic low back pain, highlighting the emerging role of the default mode network in integrating pain with self-perception, and outlining key avenues for future investigation.