Why “Take a Deep Breath” Might Not Help When You’re Stressed
I remember hearing my Dad say, “Just take a deep breath” whenever I was nervous.
We’ve all heard it. We see it everywhere—on television, in sport, in everyday life. Professional athletes often take deep breaths in high-pressure moments: a footballer stepping up for a penalty, a runner waiting for the starting gun, or a swimmer poised on the blocks.
But what if that’s not always the best advice?
If you struggle with anxiety, breathlessness, or poor breathing habits, this common advice could actually be making things worse.
When Deep Breathing Can Make Things Worse
When you feel stressed or anxious, your breathing naturally becomes faster and heavier.
So if you respond by taking bigger, deeper breaths, you might actually be adding to the problem rather than solving it.
This is known as over-breathing—breathing more than your body actually needs. It’s a common pattern in people dealing with:
- Anxiety and stress
- Asthma and respiratory issues
- Sleep problems and snoring
- Poor breathing during exercise
Understanding this is a key part of effective breathwork training.
The Hidden Role of Carbon Dioxide (CO₂)
Carbon dioxide (CO₂) is often misunderstood. Many people think it’s just a waste gas your body needs to get rid of.
But in reality, CO₂ plays a vital role in functional breathing and overall health. Did you know that when you breathe out the exhaled air contains only around 18% of CO₂ !
Healthy CO₂ levels help:
Keep your airways open (important for asthma and breathlessness)
Maintain healthy circulation
- Improve oxygen delivery to muscles and organs
- Support better sleep and recovery
In simple terms, CO₂ helps your body use oxygen more efficiently—something that is often overlooked in modern breathing techniques.
What Happens When You Overbreathe?
When you breathe too much—especially through the mouth or with big, heavy breaths—you lose too much CO₂.
When CO₂ levels drop:
Your airways narrow
- Blood vessels constrict
- Oxygen delivery to the brain decreases
- This can lead to:
Dizziness
- Increased anxiety
- Tightness in the chest
- A feeling of not getting enough air
- This is why many people with anxiety or panic symptoms feel like they can’t catch their breath—even when they are breathing more than enough.
It’s also something I often see in swimmers and athletes who struggle with breathing control during performance.
What to Do Instead: Simple Breathing Exercises
Instead of trying to breathe more, focus on breathing better.
These simple breathing exercises can help calm your body and improve breathing efficiency:
➡️ Slow your breathing down
➡️ Breathe gently through your nose
➡️ Think “light and calm” rather than “big and deep”
This style of nasal breathing helps restore healthy CO₂ levels and supports your nervous system in moving out of stress mode.
Signs Your Breathing Is Improving
As your breathing becomes more efficient, you may notice subtle changes in your body.
These are positive signs that your body is shifting into a calmer, more balanced state:
- Warm face or hands
- Yawning
- Increased saliva in the mouth
A gently gurgling stomach. These signals show activation of the parasympathetic nervous system—often called “rest and digest.”
For example:
Warmth suggests improved circulation
- Increased saliva and digestion indicate relaxation
- Yawning can be a sign that your breathing is slowing and regulating
- These are all common outcomes of consistent breathwork practice.
Sometimes, Less Is More
When it comes to breathing, more is not always better.
It’s not about how much air you can take in—it’s about how effectively your body uses the oxygen you already breathe.
By focusing on gentle, controlled breathing, you can improve your functional breathing patterns, reduce stress, and support your overall health.
Final Thought
Have you ever noticed your breathing when you’re stressed—or is it something you only become aware of when things start to feel overwhelming?
If you regularly experience breathlessness, anxiety, asthma symptoms, or poor sleep, learning how to breathe properly can make a huge difference.