A Nervous System on Edge: What Sound Work and Breathwork Can and Cannot Do
Updated: 17 hours ago
Breathwork and sound work can calm a body that has been on alert for too long, and the evidence for breathwork in particular is better than many people expect. In a 2023 meta-analysis of randomised trials, breathwork lowered self-reported stress with a small to medium effect, and anxiety and low mood improved by similar amounts, although most of the trials had a moderate risk of bias and mixed very different techniques. Sound baths have far less research behind them, mostly small studies without a comparison group. Neither practice repairs a "dysregulated nervous system" in a few sessions, and neither replaces treatment for an anxiety disorder, depression or trauma. Used for what they do well, they are useful tools. Used as a cure, they disappoint.
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What "a nervous system on edge" usually means
People use the phrase for a cluster of experiences: being jumpy, sleeping lightly, a tight chest, a racing heart at small triggers, and the sense that the body cannot switch off even when the mind wants to. Physiologically this is the stress response staying active for longer than it is useful. Heart rate stays up, breathing gets fast and shallow, muscles stay braced.
You will often read that this is explained by polyvagal theory, with talk of "vagal tone" and "safe states". The theory is popular in wellness and some therapy settings, but many researchers dispute its central claims. In 2023 the psychophysiologist Paul Grossman published a detailed critique of its five basic premises in Biological Psychology, and a 2026 international expert evaluation in Clinical Neuropsychiatry called the theory untenable. You do not need the theory to benefit from slower breathing. The effects stand on their own.
Before anything else: a racing heart, breathlessness and constant tension can also come from an overactive thyroid, anaemia, heart rhythm problems, caffeine or medication. If these symptoms are new or getting worse, see a GP or primary care doctor first. Our guide on severe burnout and finding a doctor who looks at the whole picture explains how to make that appointment count.
Breathwork: what the research shows
"Breathwork" covers very different practices. Some slow the breath down. Others speed it up on purpose. They do not do the same thing.
Slow breathing and long exhales
Slow breathing, around six breaths a minute, is the most studied form. A 2018 systematic review by Andrea Zaccaro and colleagues in Frontiers in Human Neuroscience linked slow breathing with greater heart rate variability and with feelings of calm and lower anxiety, while noting that many studies were small.
A randomised study from Stanford, published in Cell Reports Medicine in 2023 by Melis Yilmaz Balban and colleagues, compared three five-minute daily breathing exercises with mindfulness meditation over a month. Exhale-focused "cyclic sighing", a double inhale through the nose followed by a long, slow exhale through the mouth, improved mood more than meditation and lowered breathing rate at rest. The participants were healthy volunteers, not people with an anxiety disorder, so the result shows what a short daily practice can do for everyday stress.
The meta-analysis
Guy Fincham and colleagues at the University of Sussex pooled 12 randomised trials with 785 adults in a 2023 meta-analysis in Scientific Reports. Breathwork was linked with lower stress than control conditions, an effect size the authors called small to medium. Analyses of anxiety and depressive symptoms showed similar effects. The authors also asked for caution and better studies, to avoid what they called a miscalibration between hype and evidence. Most of the included trials had a moderate risk of bias.
Fast breathing is a different practice
Holotropic breathing, "conscious connected breathing" and the rapid breathing in the Wim Hof method deliberately breathe fast and deep. This lowers carbon dioxide in the blood and can cause tingling, dizziness, cramped hands and strong emotions. Some people find this cathartic. For a nervous system that is already on edge, it is often the wrong direction, at least at the start. A 2023 review led by Fincham in Neuroscience and Biobehavioral Reviews describes the physical effects of these high ventilation practices and explains why they need careful screening in clinical use.
If you have epilepsy, a heart condition, high blood pressure, are pregnant, or have a history of panic attacks or psychosis, talk to your doctor before trying fast breathing, and tell any teacher about it beforehand. A good teacher will ask before you ask.
Sound work: what the research shows
Sound baths, gong baths and singing bowl sessions are relaxing for many people, and that matters. The research behind them is thin.
The most cited study, by Tamara Goldsby and colleagues at the University of California, San Diego, published in 2017, followed 62 adults through one singing bowl meditation. Afterwards they reported less tension, anger, fatigue and low mood. But the study had no comparison group, so it cannot show whether the bowls, lying down quietly for an hour or simply expecting to feel better made the difference. The authors themselves called it an observational study.
Music therapy is a different thing. It is delivered by trained therapists, and it has stronger evidence. A 2017 Cochrane review found that music therapy added to usual care improved depressive symptoms in the short term compared with usual care alone, based on nine studies. That is evidence for a structured therapy with a qualified therapist, not for sound baths.
So the fair summary: a sound bath can be a pleasant way to rest, and resting is not nothing. Claims that specific frequencies "repair cells", "realign chakras" or "reset the vagus nerve" go well beyond anything that has been measured.
What these practices cannot do
They do not treat an anxiety disorder, depression or PTSD on their own. They can sit alongside therapy, and many therapists teach breathing as one tool among several.
They do not undo the cause. If your nervous system is on edge because of overwork, a difficult relationship, money worries or unprocessed trauma, a calmer evening helps you cope but does not change the situation.
They are not risk-free for everyone. Fast breathing has real physical effects, and deep relaxation can bring up difficult memories for some people. Practitioners who work with trauma should know how to slow things down or stop.
How to try them sensibly
Start small and on your own. Five minutes of slow breathing with long exhales, once a day for two weeks, tells you more than one expensive workshop. Notice sleep, how quickly you calm down after a stressful moment and how your chest feels.
If you want a teacher or a session, these questions help:
What training do you have, and how long was it?
What do you do if someone gets dizzy, panics or becomes upset?
Which health conditions do you ask about before a session?
Is this slow breathing or fast breathing, and why that one for me?
What do you claim this will do, and what not?
Be careful with anyone who promises to "heal trauma" in a weekend or tells you to stop medication or therapy.
Regulation in the UK and the US
Neither breathwork nor sound therapy is a regulated profession in the UK or the US. Anyone can call themselves a breathwork facilitator or sound healer, and quality varies a lot. Music therapy is different: in the UK, music therapists must be registered with the HCPC, and in the US many hold the MT-BC credential from the Certification Board for Music Therapists. If you want breathing work as part of treatment for anxiety, a registered psychologist, a counsellor with BACP or UKCP membership in the UK, or a licensed therapist in the US can teach it within therapy.
When it is more than tension
If anxiety is constant, you have panic attacks, or you cannot function day to day, talk to a GP or primary care doctor. In England you can refer yourself to NHS Talking Therapies. If you feel unsafe or have thoughts of harming yourself, in the UK and Ireland call Samaritans on 116 123, free at any time, or 999 in an emergency. In the US, call or text 988, or call 911 in an emergency.
Where Spine App fits
Spine App is a companion for body, mind and spirit that shows conventional and holistic support in one search. One filter lets you choose conventional, holistic or both, so a breathwork teacher, a music therapist and a counsellor can turn up in the same place. Physicians are found through Google Maps; other practitioners appear when they are on Spine App.
Beyond practitioners, Spine App covers sessions, events, podcasts, episodes, posts in image and video, questions and thoughts, voice notes and listings, nine kinds of content in all. That makes it easy to try a single breathing session or a sound evening before committing to more. You can see a practitioner's free times and book through Spine App, with every amount shown before you pay. Some profiles carry a verification badge, which is voluntary and means the team has checked identity or qualification. Instead of star ratings, there are experience reports by invitation. Browse practitioners and see who is available.
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Frequently Asked Questions
Does breathwork really reduce stress?
Yes, with modest effects. A 2023 meta-analysis of 12 randomised trials found breathwork lowered self-reported stress with a small to medium effect size, with similar effects for anxiety and low mood. The authors noted that many studies had a moderate risk of bias.
Which breathing technique is best for anxiety?
Slow breathing with long exhales has the most support for everyday stress. In a 2023 Stanford study with healthy volunteers, five minutes a day of cyclic sighing, a double inhale followed by a long exhale, improved mood more than mindfulness meditation. For an anxiety disorder, breathing is best learned as part of therapy. Fast, forceful breathing is a different practice and can make some anxious people feel worse.
Do sound baths work?
They help many people relax, but the evidence is weak. The best-known study followed 62 people through one singing bowl session without a comparison group, so it cannot separate the sound from simply lying down and resting. Music therapy with a trained therapist has much stronger evidence.
Is breathwork safe?
Slow breathing is safe for most people. Fast breathing practices can cause dizziness, tingling and strong emotions. If you have epilepsy, a heart condition, high blood pressure, are pregnant, or have a history of panic attacks or psychosis, check with your doctor first.
Is polyvagal theory proven?
No. It is widely used in wellness and some therapy settings, but researchers have challenged its basic premises, including a 2023 critique in Biological Psychology and a 2026 expert evaluation that called it untenable. Breathing exercises can still help without relying on that theory.
Are breathwork teachers and sound healers regulated?
Not in the UK or the US. Anyone can use these titles. Music therapists are different: in the UK they must be registered with the HCPC, and in the US many hold the MT-BC credential.
About Spine App
Spine App is a free life companion app for your health: it connects you with real practitioners – conventional, holistic or both – lets you book sessions directly, and checks in afterwards to ask what helped.
Written by the Spine App Editorial Team. Last updated October 2026.
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