Chronic Pain Shrinks the Brain, Spinal Adjustments Can Help

Pain is one of the most common reasons people come to our clinic, or seek out any kind of medical or complementary therapy. We often talk about the brain's role in producing pain, and how chiropractic adjustment and other therapies can support recovery. One phrase we hear constantly is: "Oh, I've had that pain for years."

Pain exists to warn us of potential tissue damage. Chronic pain, though, is different. It's a sign of significant, ongoing changes happening throughout the body, and particularly within the nervous system.

What Happens in the Brain During Chronic Pain

Chronic pain is often linked to reduced effectiveness in the prefrontal cortex, the part of the brain responsible for rational thought and emotional regulation. At the same time, the limbic system, which governs emotions and triggers the fight-or-flight response, tends to become overactive.

This pattern can stem from past trauma, ongoing stress, injury, illness, and a long list of other contributing factors. There's also growing research into prenatal stress specifically. If a mother experienced significant stress, trauma, or anxiety during pregnancy, her child appears more likely to face health challenges later in life.

The Brain Changes From the Moment of a Traumatic Experience

Studies consistently show that the brain begins changing from the moment a traumatic experience occurs, and these changes can be substantial. Generally, the longer stress persists, whether physical, chemical, environmental, or emotional, the more significant the resulting changes tend to be.

If you've lived with chronic pain, it likely means your prefrontal cortex and limbic system haven't been functioning at their best for some time.

Grey Matter Volume and the Prefrontal Cortex

Recent studies have found reduced grey matter volume in several brain regions among people with chronic pain. The most consistent finding is a decrease specifically in the medial prefrontal cortex, the area that plays a central role in emotional and cognitive processing during chronic pain.

Two main explanations exist for why this happens. One, based on the stress model of chronic pain we discuss often, points to changes in dendritic morphology resulting from dysfunction in the hypothalamic-pituitary axis and dysregulated neurotransmitters, which in turn affects local microvasculature in the brain.

You don't need to follow every detail of that explanation to grasp the core point: the brain begins changing from the moment of a stressful experience, and those changes can meaningfully reduce grey matter volume in the prefrontal cortex among people with chronic pain.

The Good News: These Changes Are Often Reversible

Here's the encouraging part. Losses in prefrontal cortex grey matter are often reversible once chronic pain is properly treated. That raises the obvious question: what does treatment actually look like?

Getting the prefrontal cortex, and the nervous system as a whole, functioning at its best is the goal, and spinal adjustments can be part of how that's achieved. By addressing restrictions in the spine that interfere with accurate signalling between the brain and body, adjustments support the kind of nervous system function this recovery process depends on.

If you're researching chiropractic care near me because you've lived with pain "for years" and want to understand what's actually driving it, our approach to assessing nervous system function looks specifically at this brain-body relationship, rather than treating chronic pain as something to simply manage indefinitely.

Frequently Asked Questions

Can chronic pain really change the physical structure of the brain? Research has found reduced grey matter volume in several brain regions among people with chronic pain, most consistently in the medial prefrontal cortex, which plays a key role in emotional and cognitive processing.

Are these brain changes permanent? Not necessarily. Studies suggest that losses in prefrontal cortex grey matter are often reversible once the underlying chronic pain is properly treated.

Why does the limbic system become overactive in chronic pain? It's often linked to a combination of past trauma, stress, injury, or illness, which can push the brain's fight-or-flight response into a more consistently active state.

Does stress during pregnancy really affect a child's future health? Research in this area is ongoing, but there's growing evidence linking significant prenatal stress, trauma, or anxiety to a higher likelihood of health challenges later in the child's life.

How does spinal adjustment relate to brain function? Spinal adjustments address restrictions in the spine that can interfere with accurate communication between the brain and body. Supporting this communication is part of helping the nervous system, including the prefrontal cortex, function optimally.