How Your Brain Sees Your Body

By Dr. Anthony Dileo (Osteopath)

Your brain is constantly receiving information from your body.

Every second, your joints, muscles, skin, eyes and balance system are sending messages upstairs:

Where am I?

Am I safe?

Can I move?

Is this painful?

Have I done this before?

Should I protect this area?

Your brain then uses that information to build a working “map” of your body. Not a perfect anatomical textbook map — more like a live Google Map that is constantly being updated, rerouted and occasionally confused by poor signal.

Neuroscientists often explain this using the homunculus, which is a strange little distorted human figure representing how much space different body parts take up in the brain’s sensory and motor areas.

It looks a little like Mick Jagger crossed with a house elf from Harry Potter.

Big hands. Big lips. Weird proportions. Excellent stage presence.

The reason some body parts look huge is not because they are physically bigger, but because they send and receive a lot of information. Your hands, lips and face need fine control and detailed sensation, so the brain gives them more “real estate”. Your back, by comparison, is not mapped with the same fine detail.

This brain map is not fixed. It changes with use, practice, injury, pain, confidence and experience.

A musician’s fingers, a dancer’s feet, a rock climber’s hands, a tennis player’s shoulder, or a surgeon’s fine hand control all reflect the same basic idea: the nervous system adapts to what we repeatedly ask it to do.

And yes, if politicians’ noses grew with use, some would need a separate Medicare provider number.

Pain can change how the brain maps the body

When pain is short-lived, this is usually helpful.

You roll an ankle and your nervous system says, “Let’s protect that for a while.” You limp. You move differently. You avoid certain positions. The brain becomes more alert to that area.

That is normal.

The problem is that sometimes the protective pattern hangs around after the original injury has settled. The tissue may be improving, but the nervous system is still behaving like the area is unsafe.

In clinic, I often see this with low back pain, neck pain, whiplash, shoulder injuries and long-running tendon problems. A patient will say something like:

“I know it’s better than it was, but I still don’t trust it.”

Or:

“It feels weak, but not exactly weak. More like my body just won’t let me move properly.”

That is often a clue that we are not only dealing with muscles and joints. We are also dealing with confidence, coordination, protective guarding and the nervous system’s interpretation of the area.

Importantly, this does not mean the pain is “in your head” or imaginary. Pain is real. It is produced by the brain and nervous system, but that does not make it fake. Vision is also produced by the brain, and no one says your eyesight is imaginary.

The map can become less clear

Some research suggests that in persistent pain, the brain’s representation of a painful area can become less precise. This is sometimes described as a “smudging” of the body map.

That does not mean the brain is damaged. It means the system may have become more protective and less accurate.

Think of it like trying to use Google Maps with poor reception. The road is still there, but the signal is jumpy. You might overcorrect, take the long way around, or avoid a perfectly safe turn because the map has not updated properly.

Newer research is also more cautious than older explanations. It is probably too simplistic to say that pain always “shrinks” or “distorts” the brain map in the same way for everyone. The nervous system is more complicated than that. But the broad clinical idea still holds: pain can influence how we sense, move and trust the body.

So where does osteopathy fit in?

Osteopathy is not about “clicking something back into place” or magically resetting the brain.

A more modern way to think about osteopathic care is this:

We use examination, hands-on treatment, movement, education and rehabilitation to help the body move more comfortably and confidently again.

Hands-on treatment may help reduce pain, improve movement, calm protective muscle guarding and make movement feel safer. But the longer-term change usually comes when that improved movement is reinforced with the right advice, exercises and gradual return to normal activity.

That is why I will often combine treatment with simple movement retraining.

Sometimes that might be as basic as helping someone bend forward again without bracing like they are about to lift a fridge. Other times it might involve balance work after an ankle injury, shoulder control after pain, breathing and rib movement, or graded strengthening so the nervous system gets repeated evidence that the area is safe to use.

The aim is not to force the body. It is to give the nervous system better information.

Better movement.

Less threat.

More confidence.

A clearer map.

The brain likes practice

The nervous system changes with repetition.

If you avoid a movement for long enough, the brain can become less familiar with it. If you guard your neck every time you turn your head, that guarded pattern can become the default. If you always brace your back before standing, your brain may keep treating standing as a dangerous event, even when it is not.

The reverse is also true.

Calm, repeated, tolerable movement can help rebuild confidence. This is one reason exercise, education and graded exposure are so important in modern pain care.

Not “no pain, no gain”.

More like:

“Let’s find the version of this movement your body can currently tolerate, practise it well, and build from there.”

That might not sound as exciting as a dramatic before-and-after video, but it is often how real recovery works.

Why this matters

Understanding how your brain sees your body helps explain why pain can persist, why movement can feel strange after injury, and why treatment is often most useful when it includes both hands-on care and active rehabilitation.

It also helps take some fear out of pain.

Pain does not always mean damage.Stiffness does not always mean something is “out”.A protective movement pattern does not mean your body is broken.

Sometimes your brain is simply working from an outdated map.

And fortunately, maps can be updated.

Key take-home message

Your brain is constantly mapping your body. Pain and injury can make that map less clear or more protective. Osteopathic treatment, movement, education and rehabilitation may help provide better information to the nervous system, allowing the body to move with more comfort, confidence and control.

Or, put another way:

Your body is not a machine with parts that simply wear out.It is a living, adapting system — and sometimes it just needs a better set of directions.

References

1. Nguyen JD, Duong H. Neurosurgery, Sensory Homunculus. StatPearls / NCBI Bookshelf. Updated 2023. Useful overview of the sensory homunculus and how body parts are represented in the brain.

2. Willoughby WR, et al. Somatotopic Arrangement of the Human Primary Somatosensory Cortex Derived From Functional Magnetic Resonance Imaging. 2021. Modern discussion of somatosensory mapping and how the classic homunculus is more complex than the simple textbook picture.

3. Sattin D, et al. An Overview of the Body Schema and Body Image. 2023. Review discussing body schema, body image and how the brain maintains representations of the body.

4. Cuenca-Martínez F, et al. Pain neuroscience education in patients with chronic musculoskeletal pain: an umbrella review. Frontiers in Neuroscience, 2023. Found that pain neuroscience education appears most useful when combined with other interventions such as exercise or multimodal care, rather than used alone.

5. Bagg MK, et al. Effect of Graded Sensorimotor Retraining on Pain Intensity in Patients With Chronic Low Back Pain: A Randomized Clinical Trial. JAMA, 2022. Found modest but significant improvements in chronic low back pain using a program targeting pain education, sensory processing and movement retraining.

6. World Health Organization. WHO guideline for non-surgical management of chronic primary low back pain in adults in primary and community care settings. 2023. Recommends holistic, person-centred, non-surgical care for chronic primary low back pain.

7. NICE. Low back pain and sciatica in over 16s: assessment and management. Recommends advice, self-management, exercise and, where appropriate, manual therapy as part of a treatment package rather than as a stand-alone fix.

8. Australian Commission on Safety and Quality in Health Care. Low Back Pain Clinical Care Standard. 2022. Australian guidance emphasising good assessment, avoiding unnecessary imaging and using evidence-based management.