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A major new study has shed light on why chronic pain and depression so often occur together — and the findings are fascinating.
Researchers looked at brain scans from thousands of people, alongside detailed studies in animals, and found a two‑stage pattern in the hippocampus — the part of the brain involved in memory, learning, and emotional regulation.
What they discovered:
Early in chronic pain, the hippocampus actually grows slightly. This seems to be the brain’s way of adapting and coping. But as pain continues, this shifts: the hippocampus begins to shrink, thinking becomes harder, and symptoms of anxiety and depression start to appear.
In animal studies, this change was linked to overactive immune cells in the brain (microglia), which disrupt normal brain circuits over time.
When researchers calmed these microglia, animals were protected from developing depression‑like symptoms — without harming cognition.
Why this matters:
This research shows that depression in chronic pain isn’t “in the mind” — it’s a biological process driven by changes in the brain over time. It is evidence that neurobiological changes which stem from injury and trauma drive neurobiological changes in key circuits in the brain leading to associated depression.
It also highlights microglia as a promising future target for treatments that could interrupt the pain‑to‑depression pathway.
A powerful reminder:
Chronic pain is not just a physical experience — it reshapes the brain, and understanding this can help us support people more effectively.
If you want to understand more about the neurobiology of pain – watch our animations linking the neurobiology of chronic pain to the psychological and emotional effect at: https://lnkd.in/eJWXpX7P
https://lnkd.in/et9nY-En
A major new study has shed light on why chronic pain and depression so often occur together — and the findings are fascinating.
Researchers looked at brain scans from thousands of people, alongside detailed studies in animals, and found a two‑stage pattern in the hippocampus — the part of the brain involved in memory, learning, and emotional regulation.
What they discovered:
Early in chronic pain, the hippocampus actually grows slightly. This seems to be the brain’s way of adapting and coping. But as pain continues, this shifts: the hippocampus begins to shrink, thinking becomes harder, and symptoms of anxiety and depression start to appear.
In animal studies, this change was linked to overactive immune cells in the brain (microglia), which disrupt normal brain circuits over time.
When researchers calmed these microglia, animals were protected from developing depression‑like symptoms — without harming cognition.
Why this matters:
This research shows that depression in chronic pain isn’t “in the mind” — it’s a biological process driven by changes in the brain over time. It is evidence that neurobiological changes which stem from injury and trauma drive neurobiological changes in key circuits in the brain leading to associated depression.
It also highlights microglia as a promising future target for treatments that could interrupt the pain‑to‑depression pathway.
A powerful reminder:
Chronic pain is not just a physical experience — it reshapes the brain, and understanding this can help us support people more effectively.
If you want to understand more about the neurobiology of pain – watch our animations linking the neurobiology of chronic pain to the psychological and emotional effect at: https://lnkd.in/eJWXpX7P