Overbreathing and Anxiety
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When you feel anxious, the most common advice in the world is “take a deep breath.” It sounds right. It’s also, for many people, part of the problem. If your idea of a deep breath is a big, gasping chest-full of air, you may be doing the one thing that keeps your nervous system on edge. The calmer path is quieter, smaller, and almost the opposite of what we’ve been taught.
Let me explain what “overbreathing” actually is, why it feeds anxiety, and how a gentler way of breathing settles the body — backed by respiratory science and thirty years of guiding people back to steadiness.
What is overbreathing?
Overbreathing — chronic hyperventilation — means habitually breathing more than your body needs: faster, and bigger, than your metabolism actually requires. It’s usually silent and unconscious. Over time it lowers the carbon dioxide in your blood, which quietly disrupts how oxygen reaches your tissues and how calm your nervous system feels.
We tend to think of breathing as simple: more air, more oxygen, more health. But respiration is a balance, not a maximum. Standard references put a resting adult’s breathing at about 12–20 times a minute; many breathing-science practitioners consider the lower end — closer to 10–12 slow, light breaths — optimal for a calm nervous system. People under chronic stress tend to sit at the fast, high-chest end without noticing, because it has become their normal.
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© Eva Makkos, clouds in Kerala
Can you really breathe too much?
Yes. Breathing more than your body needs doesn’t oxygenate you better — it can do the reverse. Overbreathing blows off too much carbon dioxide (a state called hypocapnia), and low CO₂ tightens blood vessels and makes it harder for your blood to release oxygen into your tissues. The result can feel exactly like anxiety: light-headed, tense, heart racing, short of breath.
This surprises almost everyone, because we’ve been taught CO₂ is simply waste. It isn’t. Carbon dioxide is the signal that regulates your breathing rate, and — through what’s known as the Bohr effect — it governs how readily oxygen is delivered where it’s needed. Breathe too much, drop your CO₂ too low, and you can feel worse, not better. Dysfunctional breathing patterns of this kind are common alongside anxiety, and the two feed each other in a loop: faster breathing heightens anxiety, and anxiety speeds the breath (Boulding et al., 2016, European Respiratory Review).
How do you know if you are over-breathing?
Because it is silent and habitual, most people who over-breathe have no idea that they do. A handful of everyday signs give it away: breathing mainly through the mouth rather than the nose; frequent sighing or yawning; visible movement high in the chest and shoulders instead of the belly; a tendency to hold the breath or speed it up under pressure; and, for some, waking with a dry mouth and an already-racing mind. No single one of these is a diagnosis, but together they point to a breathing pattern that is doing more work than the body actually needs.
This surprises almost everyone, because we’ve been taught CO₂ is simply waste. It isn’t. Carbon dioxide is the signal that regulates your breathing rate, and — through what’s known as the Bohr effect — it governs how readily oxygen is delivered where it’s needed. Breathe too much, drop your CO₂ too low, and you can feel worse, not better. Dysfunctional breathing patterns of this kind are common alongside anxiety, and the two feed each other in a loop: faster breathing heightens anxiety, and anxiety speeds the breath (Boulding et al., 2016, European Respiratory Review).
What does “deep breathing” really mean?
“Deep” doesn’t mean “big.” A truly deep breath is low — down into the belly, driven by the diaphragm — not a large, noisy gulp of air into the upper chest. Deep and low is calming. Big and high is arousing. The distinction is small in words and enormous in effect.
When most people are told to “breathe deeply,” they inflate the chest, lift the shoulders, and sigh loudly. That’s a big breath, not a deep one — and it often nudges the nervous system towards alarm rather than ease. The calming breath is the opposite: quiet, smooth, and low in the body, so gentle you can barely hear it. As the yogic tradition understood long before modern physiology confirmed it, the aim is a fine, subtle flow of breath — not force.
How does slow, light breathing calm the nervous system?
Slow, low, nasal breathing sends your brain a direct signal of safety. It shifts you towards the parasympathetic “rest and digest” branch of the nervous system, slows the heart, and raises heart rate variability (HRV) — a key marker of a resilient, flexible nervous system. You’re not imagining the calm; you’re producing it, physiologically.
The research here is remarkably consistent. A large review of the science found that voluntary slow breathing increases HRV and vagal activity and reliably moves people towards greater calm and alertness (Zaccaro et al., 2018, Frontiers in Human Neuroscience). A 2022 meta-analysis confirmed that slow-paced breathing dependably raises HeartRateVariability (Laborde et al., 2022, Neuroscience & Biobehavioral Reviews). And you don’t need much: in a 2023 Stanford randomised controlled trial of 111 adults, just five minutes a day of slow, exhale-emphasised breathing lowered anxiety and lifted mood more than an equal dose of mindfulness meditation (Balban et al., 2023, Cell Reports Medicine).
The mechanism is simple enough to feel in a few breaths: your heart slows a little on every exhale, so when you make the out-breath longer than the in-breath, you’re telling your body, again and again, that it’s safe to settle.
When overbreathing needs more than a breathing tip
For most people, learning to breathe lighter is safe and immediately helpful. But if you experience frequent air hunger, breathlessness at rest, chest pain, or panic, that deserves attention — please check in with a doctor to rule out anything medical before assuming it’s “just” your breathing.
Breathing is also emotional. When the body has spent years braced against stress, a fast, shallow pattern can become deeply wired in — and no single tip undoes that overnight. This is where patient, guided practice makes the difference: retraining the nervous system to recognise safety, so that slow, easy breathing becomes your default rather than something you have to remember. That deeper work is what I do with people, and it’s the heart of nervous system regulation.
The bigger picture: breath as the way home
The most hopeful part of all this is how ordinary the tool is. You don’t need an app, a device, or a diagnosis. You need to breathe a little less, a little slower, and a little lower — and to practise it often enough that your body believes it. The breath is the one place where you can step out of the current of anxious thought and return to yourself, in real time.
That’s the quiet promise underneath the science: you are not a problem to be fixed. You’re a nervous system that can learn safety again — and the breath is one of the most direct ways back.
Begin today — a free guided meditation. If you’d like to feel this shift, not just read about it, I’ll send you a short guided practice to settle your system. → Send me the free meditation
Want the full picture of how breath, rest, and meditation retrain your nervous system? Start with Nervous System Regulation, or explore the breathwork methods.
Standard references give a resting range of about 12–20 breaths a minute, though many breathing-science practitioners see the lower end — around 10–12 slow, light breaths — as ideal for calm. Faster, higher-chest breathing at rest can signal an overactive stress response, and deliberately slowing towards about six breaths a minute is a well-studied way to calm the nervous system (Laborde et al., 2022).
Not exactly. A panic attack is an acute surge of fear often accompanied by rapid breathing; chronic overbreathing is a subtler, ongoing habit of breathing slightly too much, which can quietly maintain anxiety and produce symptoms like light-headedness and tension (Boulding et al., 2016). Both improve with slower, lighter breathing.
Because a big, forceful breath can lower your carbon dioxide too far, tightening blood vessels and triggering the very light-headed, wired feeling you were trying to escape. A calming breath is low and light, not big and dramatic — deep in the belly, soft enough to barely hear.
No. Breathwork is a practice for wellbeing and nervous-system regulation, not medical or psychological treatment. It can sit alongside professional care beautifully, but if you’re in crisis or living with severe symptoms, please reach out to a licensed professional first.
About the Author
Eva Makkos is a doctoral candidate in Germany, having researched human transformation processes; she is a certified art therapist and has been deeply involved in identity work, consciousness research, and the integral practice of yoga, breathwork, and meditation for over 30 years. As a Transformational Breath® Group Leader and SOMA Breath® Master Instructor and Transformational Coach, she combines scientific research, traditional sources, and lived, embodied practice.
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