Your nervous system has one primary job: keep you safe. Everything it does, including producing pain, is in service of that goal.

But here’s what most of us assume: if we’re in pain, it’s because there’s damage. The pain level tells us how bad the damage is. So, more pain = more damage.

That’s not actually how it works.

Professor Lorimer Moseley, one of the world’s leading pain researchers, put it this way: pain can be understood as “a conscious correlate of the implicit perception that tissue is in danger” (Moseley, 2007). In short: your brain weighs up all the available information — the sensation from your tissues, your past experiences, your emotional state, your environment, what you believe about your injury — and if it concludes you are threatened, it produces pain. The pain is designed to protect you, to make you stop, to get you to pay attention.

The pain is real. Every time. But its intensity is not a reliable measure of how much damage has actually occurred (Butler & Moseley, 2013).

How the protection mechanism works

The easiest way I’ve found to explain this to clients is what I call the alarm system metaphor.

Think of your nervous system as a smoke alarm. A smoke alarm doesn’t actually know whether your house is on fire. It knows that there are particles in the air that might mean fire. If the alarm is well-calibrated, it goes off when there’s genuine danger. But if the alarm is oversensitive — maybe it’s right next to the stove, maybe the battery is dying — it will go off during any perceived threat.

Your pain system works the same way. It’s not measuring damage. It’s measuring perceived threat (Butler & Moseley, 2013). And that threat perception can be influenced by an enormous range of factors that have nothing to do with what’s actually happening in your tissues.

What affects the alarm?

• What you believe about your injury (“the doctor said my spine is crumbling” vs “this is a muscle strain”)
• Your stress levels and sleep quality
• Whether you’ve had this type of pain before
• How much you’re worried about what the pain means
• Your emotional state
• Whether you feel in control of your recovery
• The people around you and what they say

Moseley’s (2007) research confirmed this clearly: pain is “modulated by many factors from across somatic, psychological and social domains”. All of these inputs go into the brain’s threat assessment. All of them can turn the volume up or down.

What this means for chronic pain

This is where the science becomes genuinely important for anyone dealing with persistent pain.

When an injury is acute — a fresh sprain, a new strain — pain is doing its job. It’s protective. It’s guiding you to rest, to be careful, to heal.

But here’s what Moseley’s (2007) research showed: as pain persists, “the relationship between pain and the state of the tissues becomes less predictable”. In other words, the longer pain goes on, the less reliably it reflects what’s actually happening in your body.

If you have pain that has lasted beyond the expected healing time for an injury, the pain is not necessarily telling you that your body is still damaged. It may be telling you that your nervous system is stuck in protection mode (Butler & Moseley, 2013; Louw et al., 2024).

Why avoiding movement makes it worse

When pain is high, your instinct is to stop moving that part of your body. That feels protective. And in the short term, it is — you’re protecting damaged tissue.

But here’s the problem: every time you avoid a movement, you send a signal to your brain that says “this movement must be dangerous.” Your brain takes note. It becomes more protective. The next time you try that movement, the pain is likely worse. So, you avoid it again.

Over weeks and months, this creates a shrinking world of “safe” movements. Your muscles weaken from disuse. Your brain loses confidence in that body part. And paradoxically the pain often gets worse, not better (Medina-Viedma et al., 2025).

Central sensitisation is what we call this. Your alarm system gets stuck in the “on” position. It keeps firing even when there’s no real danger (Moseley, 2007).

This is the biggest reason people end up with chronic pain. Not because of the original injury, but because the nervous system learned to stay protective long after healing was complete (Butler & Moseley, 2013; Louw et al., 2024).

Why movement is the answer

This is where the science becomes compelling. Movement works through several parallel mechanisms:

Safety learning

When you move in a way that doesn’t produce pain — or produces less pain than you expected — your brain gets evidence that the movement is safe (Butler & Moseley, 2013).

This is why pacing matters. We’re not asking you to push through extreme pain. We’re asking you to move just beyond what feels safe, but within what’s genuinely safe. That gap is where your brain learns (Magness, 2022).

Descending pain inhibition

Your brain has built-in pain suppression systems. When you exercise regularly, you activate these systems. Your body releases endogenous opioids — your own natural painkillers — in your brainstem. You also improve serotonin regulation (Abiko et al., 2025).

The more consistently you move, the stronger these systems become. Over time, your brain gets better at suppressing unnecessary pain signals (Medina-Viedma et al., 2025).

Rewiring your brain (neuroplasticity)

When you persistently avoid movement, your brain actually shrinks the area that controls that movement. The motor cortex withdraws resources. Your brain “forgets” how to move that way confidently.

But when you gradually, consistently move, this reverses.

Exercise triggers the release of BDNF (brain-derived neurotrophic factor) — a protein that supports new neural connections and brain growth (Abiko et al., 2025). This is literally how your brain relearns movement patterns.

Studies show these changes are measurable and reversible. Brain imaging shows increased cortical thickness in people who recover from chronic pain. Their brains literally reorganise back toward healthy patterns. But this requires consistent, progressive movement (Medina-Viedma et al., 2025).

What recovery actually looks like

When you engage in progressive, appropriately-dosed movement, several things happen in parallel:

• Your pain gradually reduces
• Your motor control patterns normalise
• Your psychological confidence improves
• Your brain’s threat perception resets

None of these happen without movement. Rest alone doesn’t create these changes.

This is why the research is so clear: movement is the most effective treatment for persistent pain (Abiko et al., 2025; Medina-Viedma et al., 2025). More effective than passive therapy, more effective than most medications.

But it has to be the right movement, at the right dose, with the right understanding.

In summary…

Your pain is real. But it’s not necessarily telling you what you think it’s telling you.

When you understand that pain is your nervous system’s protective response (Butler & Moseley, 2013; Moseley, 2007), you can stop being afraid of it. When you’re not afraid, you can move. When you move progressively and consistently, your nervous system learns that you’re actually safe (Louw et al., 2024). That’s how the real recovery happens.

It’s not “pushing through.” It’s working with your nervous system instead of against it (Magness, 2022).

If you’re dealing with persistent pain, this is exactly what we focus on at Restart Exercise Physiology. We educate you about your pain, help you understand what’s actually happening in your nervous system, and guide you through progressively challenging movement, carefully calibrated to prove to your brain that you’re safe while triggering the neuroplastic changes that create lasting recovery.

Pain recovery takes time and consistency. But it works.

Yours in exercise,

Ella

References

Abiko, T., Murata, S., Iwase, H., et al. (2025). Pain neuroscience education with physical activity improves physical and psychological outcomes in older women with chronic low back pain. Scientific Reports, 15, 39157. https://doi.org/10.1038/s41598-025-39157-x

Butler, D., & Moseley, G. L. (2013). Explain pain (2nd ed.). Noigroup Publications.

Louw, A., Schuemann, T., Zimney, K., & Puentedura, E. J. (2024). Pain neuroscience education for acute pain. International Journal of Sports Physical Therapy, 19(6), 758–767. https://doi.org/10.26603/001c.120680

Magness, S. (2022). Do hard things: Why we get resilience wrong and the surprising science of real toughness. HarperOne.

Medina-Viedma, L., et al. (2025). Effectiveness of pain neuroscience education in reducing pain, disability, kinesiophobia, and catastrophizing in patients with chronic low back pain: A systematic review and meta-analysis. Medical Sciences, 13(4), 290. https://doi.org/10.3390/medsci13040290

Moseley, G. L. (2007). Reconceptualising pain according to modern pain science. Physical Therapy Reviews, 12(3), 169–178. https://doi.org/10.1179/108331907X223010