Why Do I React Like This? Understanding Your Nervous System

Have you ever found yourself freezing during an argument, even though you wanted to say something?

Or perhaps you’ve felt a sudden wave of panic over something that seemed quite small, leaving you wondering:

“Why did I react like that?”

If so, you’re certainly not alone.

It’s easy to blame ourselves or believe we’re overreacting. But often, what we’re experiencing is our nervous system doing exactly what it was designed to do—protect us.

One helpful way of understanding these reactions comes from Polyvagal Theory, developed by neuroscientist Dr Stephen Porges.

Polyvagal Theory describes how the vagus nerve—the longest cranial nerve in the body—plays an important role in regulating our nervous system and influencing how safe or threatened we feel.

Our nervous system is constantly asking one important question:

“Am I safe?”

Its primary job isn’t to make us feel calm or happy.  Its primary job is to keep us safe.

It does this automatically, often before we’re even consciously aware of what’s happening. This process is sometimes called neuroception—our nervous system’s ability to detect cues of safety or danger without us having to think about it.

Depending on what it detects, our nervous system naturally moves between different states.

🌿 Safe & Connected (Ventral Vagal State)

When we feel safe, our body is more settled and regulated.

We’re able to think clearly, connect with others, communicate, learn, laugh and be curious about the world around us.

This is often the state where we feel most like ourselves.

🔥 Fight or Flight  (Sympathetic Nervous System)

When our nervous system senses danger, it prepares us to protect ourselves.

Our heart may beat faster.

Our breathing may become quicker.

Our muscles tighten.

We may feel anxious, angry, restless or on edge.

Our body is preparing us to fight the threat or escape from it.

These reactions are not signs of weakness.

They are signs that your nervous system believes you need protection.

❄️ Freeze / Shutdown (Dorsal Vagal State)

Sometimes fighting or running away isn’t possible.

When our nervous system experiences overwhelming danger or feels trapped, it may move into a shutdown response.

You might feel numb.

Disconnected.

Unable to think clearly.

You may struggle to find your words or even feel as though your body has become heavy.

Again, this isn’t your body failing you.

It’s another remarkable survival response.

Why do these reactions happen?

One of the most important things to remember is that these responses are automatic.

They are not choices.

They are not personality flaws.

They are not signs that you’re weak or “not coping.”

Your nervous system is simply trying to keep you safe.

Sometimes our nervous system responds to the present as though it were the past.

A tone of voice, a facial expression, a place—or even a particular smell—can remind our brain of an earlier experience without us consciously realising it.

Our nervous system reacts first because its priority is survival, not accuracy.

In many situations, this rapid response protects us without even realising it.  The difficulty comes when our nervous system responds to situations that are no longer dangerous but feel familiar because of past experiences.

That’s why our reactions can sometimes seem much bigger than the situation we’re currently facing.

Can our nervous system change?

The encouraging news is that our nervous system is capable of change.

Our brains and nervous system remain adaptable throughout life.

This process doesn’t usually happen overnight.  Like learning, it takes time, patience and gentle moments of connection, support and safety.

Through safe relationships, self-awareness, counselling and repeated experiences of safety, we can gradually help our nervous system recognise that the present is different from the past.

This isn’t about forcing ourselves to “calm down.”

It’s about gently helping our body learn that it is safe enough to do so.

Over time, our nervous system can begin spending more time in that Safe & Connected state.

A final thought…

Understanding your nervous system doesn’t mean you’ll never experience anxiety, overwhelm or moments of shutdown.

But it can help replace self-criticism with curiosity.

Instead of asking:

“What’s wrong with me?”

Perhaps we can begin asking:

“What might my nervous system be trying to protect me from?”

Sometimes understanding what’s happening in our nervous system can be the first step towards healing.

If you’d like to explore your experience in a safe, supportive space, or understand your nervous system and responses fully, you’re welcome to get in touch for a free 30-minute introductory chat.