Humming
Humming is among the simplest and least assuming breathing practices available — something most people associate with absent-minded contentment rather than deliberate physiological intervention. The research behind it is more interesting than that association suggests. Humming during the exhale produces vibration in the airways and sinuses that significantly increases nitric oxide production in the nasal passages — studies have shown increases of up to fifteen times the nitric oxide output of silent nasal breathing. Nitric oxide is a vasodilator that improves blood flow, supports immune function, and plays a role in respiratory health by helping to keep the airways open and reducing inflammation. It’s also produced during normal nasal breathing, which is one of the reasons nasal breathing is consistently preferred over mouth breathing in this library — humming simply amplifies that effect substantially.
The vagal activation that humming produces through the vibration of the exhale is the other significant mechanism. The vagus nerve runs in close proximity to the structures that vibrate during humming, and the stimulation it receives produces a parasympathetic response similar to the extended exhale techniques — heart rate slows, the nervous system moves toward calm. This is part of why humming, chanting, and singing have appeared in contemplative and spiritual traditions across cultures for thousands of years. The physiological effect was understood intuitively long before the mechanism was identified.
I find this one of the more accessible entry points for people who find formal breathwork intimidating or overly clinical. There’s nothing to count, no ratio to remember, no particular posture required. You hum on the exhale and pay attention to the sensation of it — the vibration in the chest, the face, the top of the head — and the practice takes care of itself.
How to practice
Sit or lie in a comfortable position. Close the eyes if that feels natural.
Inhale slowly through the nose.
On the exhale, hum at a comfortable pitch — mouth closed, lips relaxed, the sound resonating in the chest and face. Allow the hum to continue for the full length of the exhale, ending naturally when the breath is empty.
Inhale again through the nose and repeat.
Practice for five to ten breath cycles as a starting point. The pitch can be varied — lower pitches tend to produce more chest resonance, higher pitches more facial and cranial resonance. Experiment with what feels most natural and most settling.
For a more structured practice, humming can be combined with extended exhale ratios — inhaling for four counts and humming for six to eight — to layer the vagal activation of both techniques.
Notes
The humming should feel effortless and resonant rather than forced or strained. If the sound feels tight or effortful, soften the pitch and allow the vibration to come from relaxation rather than tension.
This technique is particularly well suited to transitions — the end of a workday, the minutes before sleep, the shift between a demanding activity and something that requires a quieter presence. Its simplicity makes it easy to integrate into existing routines without requiring dedicated practice time.
Humming in a group — as in chanting or communal singing — amplifies the social and physiological effects simultaneously, which is part of why these practices have persisted across so many cultural and spiritual traditions.