Close your lips and hum.
Hmmmmmm.
It is one of the simplest sounds you can make. You may hum while cooking, walking, driving or searching for something you have misplaced. Sometimes you hum without even realising it.
But this small, instinctive act has an intriguing relationship with something far older: the ancient Indian practice of chanting Aum (Om).
At first glance, the two may seem unrelated. One is an everyday sound; the other is a sacred syllable deeply embedded in Indian spiritual traditions. Yet both involve breath, sustained vocalisation, vibration and focused attention. And modern science is beginning to explore how these simple practices may influence breathing, relaxation, the nervous system and the physiology of the upper airway.
Humming is not a miracle cure, and it should never replace medical treatment. But it is an interesting example of how something as basic as using your own breath and voice may have surprisingly complex effects.
What Happens When You Hum?
When you hum, you usually inhale and then produce a continuous sound as you slowly exhale.
That matters.
Unlike ordinary breathing, humming naturally encourages you to extend your exhalation. You have to control your breath to sustain the sound, which can make your breathing slower and more deliberate.
Slow breathing has been studied extensively for its effects on the autonomic nervous system – the system that regulates functions such as heart rate, breathing and blood pressure. Practices that slow breathing and emphasise a relaxed exhalation may encourage a shift towards the parasympathetic, or ‘rest and digest’, side of the nervous system.
In everyday language, humming can give you a reason to slow down.
And sometimes, that is precisely what the body needs.
The Fascinating Nitric Oxide Connection
One of the most interesting scientific findings about humming concerns nitric oxide (NO).
Nitric oxide is a signalling molecule produced in several parts of the body. In the respiratory system, the paranasal sinuses are an important source, and nitric oxide has roles in regulating blood vessels and supporting aspects of respiratory and immune function.
Research has found that humming can dramatically increase the concentration of nitric oxide measured in the nasal passages compared with quiet exhalation.
The likely explanation is mechanical. The vibrations created by humming and the resulting oscillations in the nasal passages may increase the exchange of air between the sinuses and the nasal cavity.
This is fascinating, but it is important not to overstate the finding.
An increase in nasal nitric oxide does not automatically mean that humming prevents infections, cures sinus problems or improves cardiovascular health. Those are much bigger claims, and there is not enough evidence to make them.
What we can say is that humming appears to have a measurable effect on the physiology of the upper airway, and researchers continue to investigate what that might mean.
Could Humming Help Your Sinuses?
Because humming affects airflow and pressure within the nasal passages, researchers have explored whether it might influence sinus ventilation.
The theory is interesting: the oscillating sound waves created during humming may help move air between the nasal cavity and the sinus spaces.
However, the evidence is not strong enough to recommend humming as a treatment for chronic sinusitis or other sinus disorders.
If you have persistent nasal congestion, recurrent sinus infections, facial pain or difficulty breathing through your nose, medical advice is far more important than any home technique.
But as a gentle breathing practice, humming is generally simple, accessible and low-risk for most people.
Your Nervous System Likes Rhythm
There is another reason humming may feel so soothing.
The human brain and nervous system respond to rhythm and repetition. When you hum, several things happen simultaneously:
- You breathe in a controlled way.
- Your exhalation becomes longer.
- You hear the sound you are producing.
- You feel vibrations around your lips, face and nose.
- Your attention becomes focused on the present moment.
In other words, humming gives your mind something predictable to follow.
If you are anxious, overwhelmed or caught in a cycle of repetitive thoughts, concentrating on the sensation and sound of mmmmmm may help interrupt that mental loop.
This does not mean humming is a treatment for anxiety disorders. But it can be a useful self-regulation technique – a small practice that helps you pause, breathe and settle.
The Aum Connection
This brings us to Aum, or Om.
In Indian spiritual traditions, Aum is regarded as a sacred syllable and is associated with profound philosophical and spiritual meanings. It is commonly pronounced as a progression of sounds – A-U-M – with the final M becoming a prolonged humming or nasal resonance.
And here is where the connection with humming becomes particularly interesting.
When you chant:
Aaaaaa-Uuuuuu-Mmmmmm
the sound gradually moves from an open vowel to a closed-lip hum.
The final mmm is, quite literally, a sustained humming sound.
As the lips come together, the sound resonates through the mouth, nose and facial region. At the same time, the chant requires a prolonged and controlled exhalation.
From a physiological perspective, this creates some of the same elements found in ordinary humming:
breath control + prolonged exhalation + vocal vibration + focused attention.
The two are therefore connected at the level of how they are produced and experienced, although they are not the same thing.
It is important to make that distinction. Aum is a sacred sound with deep philosophical and spiritual significance; humming is a universal vocal behaviour found across cultures. The scientific evidence surrounding humming should not be used to reduce Aum to merely a physiological exercise.
Yet there is an intriguing overlap between the two.
Why Does Aum Feel So Calming?
Research into chanting and meditation is still developing, and studies vary considerably in quality. Some research on Om chanting has reported changes in measures associated with autonomic activity and relaxation.
One possible explanation is the combination of slow breathing, prolonged exhalation, repetition and attention.
When you chant Aum slowly, you cannot rush through it. The sound naturally regulates your breathing. The final mmm encourages sustained vocalisation and vibration.
The practice also occupies your attention.
Instead of allowing the mind to jump from one thought to another, you focus on the sound, the breath and the physical sensation of vibration.
This is one reason chanting can function as a form of meditation.
The effect may be both physiological and psychological.
The Vibration You Feel
When you hum or chant the mmm portion of Aum, you can feel the vibration.
Place your fingers gently against your lips or cheeks while humming and you may notice it immediately.
You may feel resonance around the:
- lips;
- nose;
- cheeks;
- mouth;
- throat;
- and, depending on the pitch, the chest.
This vibration is real, but claims that it ‘massages the brain’ or directly stimulates the vagus nerve in a clinically significant way are not established by strong scientific evidence.
What we can say is that the vibration provides sensory feedback. You hear the sound and simultaneously feel it in your body. That combination may help draw attention away from distracting thoughts and towards the present moment.
Humming as Mindfulness
You do not have to meditate for 30 minutes to experience a moment of mindfulness.
Try humming for two minutes.
Notice the sound.
Notice the vibration.
Notice the breath leaving your body.
Notice what happens when the sound ends.
For those two minutes, you are not planning dinner, worrying about tomorrow or replaying yesterday’s conversation.
You are simply humming.
This makes humming an accessible form of informal mindfulness – particularly for people who find sitting in silence difficult.
Humming and Stress
Chronic stress keeps the body in a state of heightened alertness. Over time, persistent stress can affect sleep, mood, blood pressure, digestion and overall wellbeing.
Humming may offer a simple way to introduce a pause into the day.
You might hum:
Before a stressful telephone call, to slow yourself down.
After an argument, before responding in anger.
During a difficult journey, to create a sense of calm.
After work, as a transition from activity to rest.
Before bedtime, as part of a relaxing evening routine.
The purpose is not to ‘cure’ stress but to create a moment in which your breathing becomes slower and your attention becomes steadier.
Sometimes, a pause is powerful.
Could Humming Help You Sleep?
There is not yet enough direct evidence to say that humming treats insomnia.
However, humming may be useful as part of a bedtime wind-down routine because it combines slow breathing, repetitive sound and focused attention.
Instead of scrolling through your phone until you are exhausted, try switching off the screen, dimming the lights and humming softly for a few minutes.
You may find that the ritual itself becomes a signal to your brain that the day is ending.
Humming and Mood
There is a deeply human side to humming that science cannot fully capture.
You may hum because you are happy.
You may hum because you are nervous.
You may hum because a song has suddenly appeared in your head.
And sometimes a tune from 50 years ago can return in an instant.
Music and memory are closely connected, and familiar melodies can evoke remarkably vivid autobiographical memories. This is one reason music is used in reminiscence activities and in some dementia-care settings.
A familiar hum can take you back to a childhood home, a first dance, a favourite film or a person you have not thought about for years.
The sound may last only a few seconds.
The memory can last a lifetime.
Humming, Singing and Social Connection
Humming is also the smallest form of singing.
While humming alone will not necessarily produce all the benefits associated with singing in a choir or group, music-making is widely associated with social connection and emotional wellbeing.
Perhaps this is why humans have used vocal sounds in communal activities for thousands of years – in songs, chants, prayers, rituals and celebrations.
Our voices do more than produce sound.
They connect us to ourselves and to one another.
A Simple Humming Practice
You can try this anywhere.
Sit comfortably and relax your shoulders.
Close your lips gently.
Take a comfortable breath in through your nose.
Now exhale slowly while making a soft:
Mmmmmmmmm.
Do not force the sound.
Do not strain your throat.
Simply allow the hum to continue for as long as your breath remains comfortable.
Repeat five times.
As you hum, notice the vibration around your lips and face.
If you enjoy the experience, gradually extend the practice to two or five minutes.
Try the Aum Version
If you would like to explore the connection with Aum, try chanting it slowly.
Take a comfortable breath in.
Then exhale:
Aaaaaa-Uuuuuu-Mmmmmm.
Allow the final M to become a gentle hum.
You can repeat this several times, paying attention to the transition from open sound to closed-lip vibration.
If you come from a tradition in which Aum has spiritual significance, you may wish to approach the practice as meditation or prayer rather than simply as a breathing exercise.
There is no need to choose between the scientific and spiritual perspectives. They are answering different questions.
Science can investigate what happens to breathing, heart rate, brain activity or nasal nitric oxide.
Spiritual traditions explore meaning, consciousness and the human experience.
Both perspectives can coexist without one having to replace the other.
When Not to Hum
Humming is generally safe for most people, but stop if it causes dizziness, breathlessness, pain or discomfort.
If you have significant respiratory problems, vocal-cord issues or persistent sinus symptoms, consult your healthcare professional.
And remember that humming is a complementary wellbeing practice, not a medical treatment.
It cannot replace prescribed medication, treatment for sinus disease or professional care for anxiety, depression or sleep disorders.
The Sound of Stillness
Perhaps the most remarkable thing about humming is its simplicity.
You carry everything you need to do it.
No equipment.
No special clothes.
No expensive wellness retreat.
Just your breath, your voice and a few quiet moments.
The science suggests that humming can influence nasal airflow and nitric oxide levels, while its combination of prolonged exhalation, rhythm and vibration may encourage relaxation and focused attention.
Aum takes some of these same elements and places them within a much older spiritual tradition, where sound becomes a vehicle for contemplation and connection.
Whether you hum absent-mindedly while making tea, chant Aum during meditation or simply sit quietly and make a soft mmm sound, you are doing something profoundly human.
You are breathing.
You are listening.
You are feeling the vibration of your own voice.
And, for a few moments, you are giving your busy mind permission to be still.
Sometimes wellness does not have to be complicated.
Sometimes it begins with a breath – and ends with a hum.