Does chronic pain change brain structure and function?

What actually changes in the brain with chronic pain?

Chronic pain doesn't just hurt—it physically reshapes your brain. A comprehensive 2024 meta-analysis of over 100 studies found that people with chronic pain consistently show reduced gray matter (brain tissue) in the insular cortex, a region that integrates bodily sensations with emotions [4]. The same study also found that this area becomes hyperactive when pain is triggered, while its connections to other networks, like the frontoparietal network (involved in attention and decision-making), become weaker [4]. In plain terms, the brain's pain-processing hub shrinks and gets stuck in a hyper-alert state, while its ability to regulate that signal degrades.

These changes aren't limited to one type of pain. A separate transdiagnostic meta-analysis of over 10,000 patients found that chronic pain shares common brain changes with depression and anxiety—specifically, reduced gray matter in the insula and medial prefrontal cortex (involved in self-awareness and emotional control) [5]. This helps explain why chronic pain so often co-occurs with mood disorders: the same brain regions are being altered.

How do brain networks get reorganized by chronic pain?

Beyond individual regions, chronic pain rewires the way entire brain networks talk to each other. A 2023 study using functional MRI found that people with chronic pain showed altered 'segregation' between two major networks: the default mode network (DMN), which is active when you're at rest and thinking about yourself, and the dorsal attention network (DAN), which handles focused tasks [3]. Specifically, lower segregation of the DAN (meaning it was less distinct from other networks) predicted worsening pain over time [3]. This suggests that chronic pain blurs the boundary between resting and task-focused brain states, making it harder to disengage from pain.

The same study also found that a psychological factor called 'helplessness'—a component of pain catastrophizing—strengthened the link between DMN segregation and pain progression [3]. In other words, how you think about your pain interacts with these brain changes to drive the condition forward. This is a concrete example of mind-brain interplay: your thoughts can amplify or dampen the neural reorganization.

Can these brain changes be reversed?

Yes, there is evidence that brain function can improve with effective treatment, even if structural changes take longer. A 2024 randomized clinical trial tested a single open-label placebo injection (a saline shot honestly described as a placebo) for chronic back pain [1]. Compared to usual care, the placebo group reported a 0.61-point reduction in pain intensity on a 0–10 scale at one month (a modest but real effect) [1]. More importantly, brain scans showed that the placebo increased activity in the ventromedial prefrontal cortex (a region involved in top-down pain control) and strengthened its connection to a brainstem pain-modulatory nucleus [1]. This means that even a non-deceptive placebo can engage the brain's own pain-relief circuitry.

However, the pain relief did not persist at one-year follow-up, though benefits for mood and sleep did last [1]. This suggests that while brain function can be shifted in the short term, maintaining those changes likely requires ongoing intervention. The takeaway: your brain is not permanently broken by chronic pain, but reversing the changes may require sustained, multi-pronged treatment that addresses both the neural and psychological dimensions.

Sources used in this answer

Related research questions