Do people with chronic pain and depression show changes in their brain structure?
Chronic pain and depression often occur together, and research suggests this combination is linked to changes in the brain. A large study using UK Biobank data found that people with both conditions have differences in brain structure compared to those without either condition. These changes include lower volume in certain brain regions and alterations in the brain's white matter, which connects different areas. While these findings show a connection, they do not prove that one condition causes the other.
What the research says
A cross-sectional study of over 71,000 UK Biobank participants examined brain structure in people with chronic pain and depression 4. Compared to healthy controls, those with both conditions showed widespread differences: lower cortical volume (the outer layer of the brain), smaller thalamus, hippocampus, and left accumbens volumes, and changes in white matter microstructure 4. These brain regions are involved in processing pain, emotion, and reward. The study also found that the brain changes in the comorbidity group were more extensive than in people with only chronic pain or only depression 4. Another analysis from the same UK Biobank cohort found that chronic pain is linked to a 7.5-fold increase in severe depressive symptoms, and that the two conditions share genetic factors 2. A separate systematic review noted that adverse childhood experiences can lead to brain changes that increase vulnerability to both chronic pain and depression, though no study in that review examined all three together 9. Overall, the evidence points to shared brain structure alterations in chronic pain and depression, but more research is needed to understand the exact mechanisms.
What to ask your doctor
- Could my chronic pain and depression be affecting my brain health, and are there treatments that address both?
- Are there any brain imaging studies that might be relevant to my condition?
- What non-drug approaches, such as mindfulness or cognitive behavioral therapy, might help with both pain and mood?
- Should I be screened for depression if I have chronic pain, or vice versa?
This question is drawn from common patient questions about this topic and answered using cited medical research. We do not provide individualized advice.