How Stress Shows Up in the Body (Not Just the Mind)

What it Feels like When Your Nervous System is in Defence Mode

This post is part of a 5-part series designed to help you understand your nervous system and how it shapes your thoughts, feelings, and responses. You can explore the full Nervous System Series here: As you move through each post, you’ll begin to recognise your own patterns and learn how to support yourself with more ease and compassion.

Start from the beginning here: Week 1: Understanding Your Nervous System

Welcome to Authentic Living Coaching.
I’m Linda Codlin, Transformational Life Coach.
Welcome, my friends.

Week 3: What It Feels Like When Your Nervous System Is in Defence Mode

Most of us were taught to think of stress as something that happens in the mind.
We believe that if we could just think more positively, organise ourselves better, or stop worrying so much, the feeling of stress would disappear.
But stress is not just a thought pattern.
It is something that happens in the body.
Your nervous system is constantly scanning your environment, quietly asking a simple question:

Am I safe right now?

When the answer feels uncertain, your body shifts into protection mode.
And when that happens, the experience can show up in ways that are easy to misunderstand.

We are not trying to become calm.
We are learning how to feel safe.

Stress Shows Up in the Body
When the nervous system senses possible danger, it begins preparing the body to act.
This preparation often shows up through physical sensations.
You might notice your jaw tightening, your breathing becoming shallow, or a pressure across your chest. Your shoulders may lift without you noticing, or your stomach may feel unsettled.
These reactions are not signs that something is wrong with you.
They are signs that your body is doing exactly what it was designed to do.
Your nervous system is not dramatic.
It is protective.

Hypervigilance – Always Scanning

When the body is in defence mode, it becomes very skilled at noticing potential problems.
This can appear as hypervigilance.
You may find yourself scanning conversations for meaning, noticing subtle changes in someone’s tone, or analysing situations long after they have finished.
Your awareness becomes tuned toward anything that might signal danger or disapproval.
This heightened alertness once helped humans survive in unpredictable environments.
But when it stays switched on for too long, it can feel exhausting.

When Thinking Becomes Overthinking

When the nervous system feels unsettled, the mind often tries to regain control by thinking harder.
This is where overthinking begins.
Your mind may replay conversations, analyse decisions, or try to predict every possible outcome. It can feel like you are trying to think your way into safety.
But the body does not always respond to thinking.
Sometimes what the nervous system needs most is reassurance that the environment is safe enough to soften.

Irritability or Emotional Numbness

Defence mode can also affect the way we experience emotions.
For some people, this shows up as irritability. Small frustrations feel bigger, patience becomes thinner, and reactions may feel sharper than expected.
For others, the experience is quite different.
Emotions can feel distant, muted, or difficult to access. This emotional numbness is another protective response, allowing the body to conserve energy when it feels overwhelmed.
Both reactions are ways the nervous system protects us.

Why Rest Can Feel Uncomfortable

One of the most confusing experiences for many people is that rest does not always feel restful.
You might finally have time to relax, yet your body feels restless, distracted, or uneasy.
You may reach for your phone, start organising something, or look for another task to complete.
This happens because the nervous system has become used to staying alert.
When activity stops, the body suddenly becomes aware of how activated it has been. Slowing down can feel unfamiliar, even unsafe at first.

Survival Comes First

When the nervous system senses possible danger, it prioritises survival over everything else.
Energy is directed toward alertness, protection, and preparation.
At the same time, other experiences naturally move into the background.
Connection. Creativity. Curiosity. Joy.
These states become easier to access when the body feels safe enough to soften its defences.
This is why it is so difficult to simply think your way out of stress.
You cannot mindset your way out of biology.
The body responds to signals of safety, and those signals take time.

A Gentle Body Scan

One way to begin reconnecting with the body is through a simple body scan.
You might like to try this now or later today.
Take a slow breath and bring your attention to your body.
Notice your jaw.
Is it relaxed or slightly tight?
Notice your shoulders.
Are they lifted or resting naturally?
Bring awareness to your breathing.
Is the breath deep or mostly in your chest?
Slowly move your attention down through your body — chest, stomach, hips, legs.
There is nothing to fix here.
You are simply noticing.
Sometimes the first step toward safety is allowing the body to be seen.

Food for Thought

You might like to reflect on this question:
When you pause during the day and notice your body, what signals does it most often send you?
Is there tension somewhere? Restlessness? Fatigue?
Spend a few moments simply noticing what your body is communicating.
Awareness is often where change begins.

Learning about the nervous system is not about forcing ourselves to become calm.
It is about learning how to recognise when the body is protecting us, and slowly teaching it that safety is possible again.
Your reactions are not flaws.
They are signals from a system that has been working hard to keep you safe.
And when we begin to listen to those signals with curiosity rather than judgment, the nervous system can begin to soften.

Next week we will explore how the nervous system begins to feel safe again, and simple ways we can support that process in everyday life.

oxo Linda

---

Share Your Reflections

You might like to take a few moments to notice what stood out to you as you read.
What are you becoming aware of in your body, your thoughts, or your responses?
You may find it helpful to gently observe this over the next few days — patterns often become clearer with time and awareness.
If it feels supportive, you’re invited to reflect a little more deeply here:

👉 Share your reflections (this opens a short reflection form)

---

If You’d Like to Explore This Further

If something in this stirred recognition, and you feel curious about understanding yourself more deeply, you’re warmly invited to take the next step.
I offer a free 30-minute introduction to coaching — a gentle, no-obligation space to meet, ask questions, and sense whether this work feels right for you.

👉Book a free 30-minute introduction

---

You can explore the full series below, moving at your own pace.

Looking Back:

• Week 1: Understanding Your Nervous System (And Why Does it Run My Life?)
• Week 2: Fight, Flight, Freeze & Fawn: Understanding Trauma Responses

Looking Forward to What is Coming

• Week 4: How to Soothe the Nervous System (Without Forcing It)
• Week 5: Living Differently When Your Nervous System Feels Safe

---

As a certified Life Coach, I help you to help yourself, so you can create a well lived life your way. 

If what I am sharing resonates with you, follow me, reach out, share with a friend, like or leave a message below,

When you are ready to make a transformational difference in your life, contact me for a one on one coaching session.