If your child struggles with anxiety, you might have noticed that it doesn’t just show up as worry or fear in their brain. Anxiety often finds expression in the body. Children might complain that their tummy hurts before school, their heart feels funny, or they can’t catch their breath. Whilst these physical sensations can seem random or even alarming, they are actually signs that the body’s natural protection system has switched on.
Understanding what’s happening inside the body can help both you and your child feel calmer and more in control. Anxiety symptoms can feel scary, but they are not dangerous. They are part of how humans are wired to survive.
Our Bodies Are Designed to Cope With Threat
To understand anxiety, it helps to go back to our evolutionary roots. Humans evolved from being prey animals and at a time when we had to stay alert to survive. Thousands of years ago, our ancestors lived with constant physical danger. If a sabre-toothed tiger appeared, the brain had to react instantly, triggering a “fight or flight” response.
This automatic system kept us alive. It flooded the body with stress hormones, preparing us to either fight the danger or run away from it. That same system still lives in our bodies today. The problem is, while we no longer face wild animals, our brains react in the same way to modern, psychological threats.
What Counts as a “Threat” Today?
Today’s threats are rarely physical. They are social and emotional. For a child, the brain can trigger the same powerful fear response not because of a tiger but because of things like:
Feeling disconnected from a safe adult (e.g., Mum or Dad leaving at the school gate)
Feeling rejected or left out by friends
Feeling humiliated or embarrassed in class
Facing something new or uncertain
The brain doesn’t always distinguish between a real physical threat and a perceived emotional one. If a child feels unsafe, the brain’s alarm system activates automatically.
The Amygdala: The Brain’s Alarm System
At the heart of this process is a small, almond-shaped structure deep inside the brain. It is called the amygdala and its job is to keep us safe. When the amygdala senses danger, either real or imagined, it activates an emergency chain reaction which floods the body with stress hormones such as adrenaline and cortisol. These hormones prepare the body for action: to fight, flee, or freeze.
This system works brilliantly if there’s real danger, for example if a car suddenly speeds towards you. When there isn’t a physical threat however, these same changes can feel confusing and frightening. For a child who doesn’t understand what’s happening, these physical sensations can seem like something is seriously wrong.
What Happens in the Body During Anxiety?
Let’s look at the main physical changes that happen when the amygdala sounds the alarm and consider how they might feel to your child.
1. Breathing Changes
The first thing that often happens is a change in breathing.
Instead of slow, steady belly breaths, the body switches to fast, shallow breathing from the chest. This is designed to bring in more oxygen, so the muscles are ready to run or fight.To your child, this can feel like:
A tightness in the chest
Shortness of breath
A feeling that they can’t get enough air
This can be frightening, especially if they don’t know it’s just their body preparing for action.
2. Heart Rate Increases
Next, the heart begins to beat faster. It’s working harder to pump oxygen-rich blood around the body, ready for emergency action.
This can feel like:
A pounding or racing heartbeat
Fluttering or thumping in the chest
For adults, this can sometimes feel so intense that people worry they’re having a heart attack. For a child, it can simply feel “wrong” or “too much” though it is a normal and temporary part of the fight-or-flight response.
3. Muscles Tighten and Tremble
As the body prepares for movement, energy is directed into the big muscle groups in the arms and legs. This can cause:
Shaking or trembling
A feeling of tension or stiffness
It’s the body’s way of saying, “Get ready to move!” When there’s nothing to fight or run from however, that energy has nowhere to go and this can make your child feel restless or fidgety.
4. Sweating or Feeling Clammy
When the body prepares for rapid movement, it also turns on its cooling system; just like a car!
Your child might suddenly feel sweaty or clammy. It’s simply the body’s way of preventing overheating during a potential burst of activity.5. Cold Hands and Feet
During the threat response blood is redirected towards the major muscle groups and away from the hands, feet, and skin. This helps maximise blood flow to boost physical strength and take oxygen and nutrients to where they are needed most.
That’s why people sometimes describe “cold feet” or a “chill” running through them when they’re scared. It’s not a sign of illness; it’s the body being efficient.
6. Butterflies or Nausea
Digestion is not a priority when survival is at stake so blood is diverted away from the stomach and intestines toward the muscles. This can create that “butterflies” feeling, nausea, or even a sudden need to go to the toilet.
One of the most common complaints in anxious children is tummy pain, regularly heralding rising anxiety and often appearing before school or social events. It’s not “all in their head” but rather a physical response to stress hormones moving through the body.
7. Dizziness or Feeling Detached
Sometimes, when the body is preparing for action but the person isn’t actually moving, oxygen levels can become unbalanced. This can lead to:
Light-headedness
Feeling detached or “spaced out”
Tingling in the fingers or lips
It can feel as if the world is unreal or distant, which can be frightening for children. But again, this is just the body doing its best to keep them safe.
Why These Feelings Are Scary but Not Dangerous
When there’s no real danger, all this preparation becomes both unnecessary and uncomfortable. The body is full of energy and hormones with nowhere to go.
Children often don’t understand why they feel this way and may tell you they are worried they might be ill, about to faint, or that something terrible is happening. As adults, it’s important to reassure them: these feelings are not dangerous. They are temporary. They will pass.
Anxiety is like a wave that rises and falls. The goal is not to avoid the wave but to learn how to navigate and ride it! In these moments your relationship with your child is the most important resource you can use. Our children are programmed to look to us to learn what is safe and what is not so use this knowledge to be contagious with your calm! This understanding alone can make a huge difference and just by naming what is happening we can make the experience less mysterious and frightening.
Step One: Anchor them by reminding the brain it is safe
The amygdala acts automatically but it is not refined. Sometimes it misreads signals, over-generalises from past experiences and overreacts. Just like a smoke alarm going off when the toast is burning instead of when the house is on fire, the setting can become oversensitive and in need of adjustment from an outside source.
The first step in resetting anxiety is to send the brain a clear message: “I’m safe. There’s no real danger.”
Parents can do this in two ways:
Understanding: Talking to your child about the physical symptoms of anxiety at a time when they feel settled and you have time to spend with them will help you both find the language in the moment to revisit what is happening in their body and contain their worries about this.
Grounding: Exploring strategies ahead of experiencing anxiety can also help you both to know how to help the body move out of the threat state and into safety.
The more often your child masters the rise and fall of anxiety the more they will learn to trust the process and know for themselves that the feelings will pass.
Step Two: Take action to co-regulate their body
One of the most powerful tools for calming the body is breathing.
Breathing is special because it is controlled by both the automatic and the conscious parts of the brain. Most of the time, we breathe without thinking. But we can also choose to consciously slow it down.
When we breathe quickly, the brain interprets it as a sign of danger and keeps the fight-or-flight response active. When we breathe slowly, it signals that we are safe—and begins to switch off the alarm system.
You can help your child by practicing calm breathing together. For example:
Smell the flower, blow out the candle – a gentle, child-friendly way to slow the breath
Count to four in, six out – a longer exhale helps the body relax
Place a hand on the tummy – to encourage deeper, slower breaths from the diaphragm, not the chest
The key is gentle consistency, not perfection.
Step Three: Ground them in the present moment
When a child’s body is in panic mode, they are often lost in “what if” thoughts. Helping them come back to the present can be grounding.
Simple grounding techniques include:
Name 5 things you can see, 4 things you can touch, 3 things you can hear, 2 things you can smell.
Press your feet into the floor and notice the ground supporting you
Do something active to give the adrenaline something to do! Can you safely jump, stomp, skip or run?
These sensory moments can help remind the brain that the body is safe right now and help to tolerate the distress.
Step Four: Trust the Process
Learning to ride out anxiety takes courage. It’s a bit like walking out of a dark tunnel one step at a time.
When we panic, we often freeze or run away from the feeling and that can be what keeps us stuck. The way out is to do the opposite action: breathe to calm the brain and switch thinking back on; breathe to calm the body, stay with the feeling and notice it pass.
With time and experience, children (and adults) learn that the sensations of anxiety rise, peak, and fall away. Nothing terrible happens. This trust grows stronger each time.
Every Body Is Different
Every child’s anxiety looks a little different. Some may feel it mainly in their tummy, others in their chest or head. Some get shaky or teary, others go quiet or irritable.
There’s no “wrong” way for the body to react. What matters is helping your child notice their unique signals and learn what helps them feel safe again.
Safety Is the Antidote to Threat
The opposite of fear is not bravery….it’s safety.
When a child feels physically and emotionally safe, the brain’s threat system stands down. Safety might come from:
A calm, reassuring parent voice
Physical touch (like a hug or holding hands)
A predictable routine
Familiar comforting objects
Deep, steady breathing
What matters most is that your child’s body feels safe—not just that you tell them they are safe.
The Path to Recovery
Helping your child manage anxiety isn’t about eliminating these sensations—it’s about understanding and normalising them. The goal isn’t to stop the body’s alarm system from ever switching on, but to help your child learn how to switch it off again once they know they are safe.
This takes persistence, practice, and patience. Over time, your child will learn to trust their body. They will recover more quickly from anxious moments, and their responses will become less intense.
Key Takeaways for Parents
Anxiety is physical. The symptoms are real, not imagined.
The body’s alarm system evolved to keep us safe. Anxious symptoms don’t mean your child’s amygdala is broken….just overprotective.
Understanding what’s happening reduces fear. Knowledge brings calm.
Calm breathing and grounding help turn off the threat response.
Safety and relationships (not logic) is what calms anxiety. Children need to feel safe before they can think clearly.
With practice, anxiety becomes more manageable. These sensations will always pass.
A Final Reassurance
If your child experiences these symptoms, it doesn’t mean something is wrong with them or with you as a parent. It means their body is doing exactly what it was designed to do: protect them.
Your role is to help them understand what’s happening, stay grounded and trust that the storm will pass. Every time you guide them through that process, you strengthen their confidence and resilience. By modelling how to remain calm in these moments, you send a clear signal to your child that they can manage these big sensations.
Anxiety can feel powerful and uncomfortable but with knowledge, compassion and calm presence, you and your child can learn to live alongside it without fear.
On October 20, 2025 / By Polly Crofts
Anxiety doesn’t just happen in your child’s mind, it shows up in their body too. From tummy aches to racing hearts, these signs are part of the body’s natural safety system. Learn how to recognise them and support your child through calm understanding and connection.