Primitive Reflexes: The Hidden "Safe Mode" That Can Keep Your Nervous System Stuck

If you have been dealing with anxiety, chronic pain, fatigue, vestibular symptoms, sleep issues, gut sensitivity, or a body that feels like it is always bracing for something, it can start to feel like you are managing symptoms forever.

At Functional Neuro Health (FNH), one of the places we often look for a deeper driver is something most adults have never heard of:

Primitive reflexes.

They are not "a kids thing." They are not just for learning difficulties. And they are not rare.

In the FNH model, primitive reflexes are one of the clearest windows into whether the nervous system is running with freedom, or running in protection.

Watch: Nick's Primitive Reflex Talk

Before diving into the article, watch this short talk by Nick — it covers the core concept in plain language in under five minutes.

What are primitive reflexes?

Primitive reflexes are automatic survival responses that originate in the brainstem and are present in babies and very young children. They are designed to help a newborn respond to sudden stimuli, orient to safety, coordinate basic movement patterns, feed and bond with caregivers, and build the foundation for later posture, balance, coordination, and learning.

As the brain matures, these early reflexes are meant to switch off and be replaced by more mature, flexible movement and regulation.

But here is the important part:

Why would an adult have primitive reflexes active?

One of the strongest clinical themes in Nick's work is this: head injuries and trauma can switch reflexes back on.

Not only major injuries. Sometimes even seemingly "small" head impacts or whiplash events can be enough, depending on the person's threshold and life load.

Other common triggers include:

• Physical injury and chronic pain states
• Psycho-emotional trauma (which can mirror the physiology of impact trauma)
• Chronic stress and burnout
• Infections and inflammatory load
• Developmental history (childhood stress, illness, learning challenges)

This does not mean anything is "wrong" with you as a person. It means the nervous system has an old survival program running in the background.

What it can feel like when reflexes are active

People often think reflexes would look dramatic. Sometimes they do. But more often, reflex patterns show up as subtle, familiar "personality" or "body" themes that people have normalised.

Key reflexes (in plain English)

There are many primitive reflexes, but here are three important ones Nick highlights in his clinical work:

Why traditional reflex work can take months — and why FNH is different

Many reflex programs work like this:

1. Identify a reflex pattern
2. Do a set of exercises to "train it out"
3. Repeat for weeks or months

Those exercises can be useful. But the core critique is:

They are missing a step.

At FNH we ask: If a reflex is "on," what is driving it?

Because the reflex is not the real problem. The reflex is the nervous system's response.

A client story that helps this make sense

In his lecture, Nick shares a case where a person had been working with a therapist for a long time on a freeze response pattern.

After the Fear Paralysis Reflex was addressed (and other drivers cleared), the person experienced a calmness they had not felt before — and their therapist noticed the shift immediately in the next session.

Sometimes you cannot talk your way out of a reflex pattern, because the reflex lives below thinking. When the nervous system exits safe mode, the whole person becomes more reachable: emotionally, cognitively, physically.

What does this look like in an in-person session?

While each session is personalised, reflex work at FNH often looks like:

• Assessment that does not rely on "guessing" or interpretive observation alone
• Precise testing to see which reflex patterns are active
• Finding the "why" underneath the reflex — often a specific driver the nervous system is protecting from
• A targeted correction
• Re-testing to confirm the nervous system has updated

And importantly:

If reflexes turn back on after a future stressor or head knock, that is not proof the work failed. It is proof they are protective programs. The difference is: now your system has a way back out.

Who should consider reflex-based work?

You might consider it if you resonate with:

• Chronic anxiety that feels physical
• High startle response
• Difficulty downshifting and sleeping deeply
• Sensory overwhelm (light, noise, busy environments)
• Recurring "same issues" even after doing the right things
• Post-concussion history or repeated minor head knocks
• Chronic pain patterns that do not behave like a simple mechanical issue

A gentle next step

If primitive reflexes are one of the hidden drivers in your system, you do not need more discipline or more force.

You need your nervous system to come out of safe mode.

At FNH, we approach this with precision: identify what is driving the reflex, correct it, confirm the shift, and then embed it so your system can keep building capacity.