Humming Vocal Warm Ups: 7 Easy Exercises to Improve Your Voice
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Humming is the most underrated thing you can do for your singing voice. It costs nothing, it works in a car or a kitchen or a bathroom with the door shut, it is quieter than talking, and it does more for a cold voice in five minutes than most people manage in twenty.
This page covers what humming is actually doing inside your throat, where the popular claims about it hold up and where they do not, how straw phonation takes the same idea further, and a seven-exercise routine that fits in five minutes.
The short version
Humming and straw phonation belong to a family of exercises called semi-occluded vocal tract exercises. Partly closing the far end of the tube sends pressure back toward the vocal folds so they vibrate efficiently at low effort. That is why a hum warms the voice faster than singing does, why it is gentler on a tired voice, and why voice therapists reach for it first. Five minutes, seven exercises, quiet enough for a shared house.
What humming actually does to your voice
When you hum, your lips close and the sound has to find its way out through your nose. That partial closure is the whole mechanism.
Closing off most of the exit raises the air pressure just above the vocal folds. That back-pressure does two useful things at once: it holds the folds in a position where they meet cleanly without you squeezing them together, and it means you can get a full, resonant sound while pushing far less air. You are, in effect, letting physics do the work your throat muscles would otherwise try to do.
This family of exercises has a name — semi-occluded vocal tract exercises — and humming, lip trills and straw phonation are all members of it. Researchers who measured the pressures produced inside thirteen of these gestures describe them as an economical way to work the voice, which is exactly the property you want in a warm-up.1
The practical consequences, in the order you will notice them: the voice arrives faster, the little catch at the start of a note stops happening, the tone gets rounder, and your throat feels open rather than busy.
A hum is not a gentler version of singing. It is a different tool, and for waking a voice up it is the better one.
The nitric oxide claim, and what it really shows
If you have read about humming anywhere in the wellness world, you have met this study, usually stripped of its context. It is worth getting right.
In 2002, Weitzberg and Lundberg measured nasal nitric oxide in ten healthy people during humming and during quiet exhalation. Humming increased nasal nitric oxide roughly fifteen-fold.2 That is a large, well-replicated effect, and it happens because humming causes rapid gas exchange between the nose and the paranasal sinuses, where nitric oxide is produced.
What the study measured was gas concentration in the nose. It did not measure immunity, mood, sinus health, or anything about your singing. So the honest version is: humming does something real and measurable to the air in your sinuses, and if that turns out to matter clinically, good — but it is not why you should hum before you sing. You should hum before you sing because of the pressure mechanism in the section above, which is far better established for voice.
Warm up into the right notes 🎯
Sirens and slides work best when you know where your range actually starts and stops today. Three notes — a comfortable middle one, your lowest, your highest — and the routine below has somewhere to aim. Your voice never leaves your device.
Free · about 2 minutes · nothing is recorded or saved.
Straw phonation: the same idea, turned up
If humming is a partly closed tube, a straw is a very nearly closed one. Same principle, stronger effect, and it is the quietest effective vocal exercise I know. The full straw phonation guide takes it further, with six exercises in the order I teach them.
Take an ordinary drinking straw, put it between your lips, and hum through it. Slide gently up and down your comfortable range. Two minutes is plenty. For a version you can actually see working, put the far end of the straw into a glass of water an inch or two deep and hum until the water bubbles steadily — even bubbles mean an even airflow, and a stuttering bubble tells you your breath is not steady yet.
A wider straw is easier and a narrow coffee stirrer is harder. Start wide. If you feel pressure building in your throat rather than at your lips, the straw is too narrow for you today.
This is the exercise to use when the house is asleep, when your voice is tired at the end of a long day, or when you want the fastest possible warm-up before you have to sing. If quiet practice is your constraint generally, practicing singing at home quietly goes through the other near-silent options.
The five-minute routine: seven exercises in order
The order matters more than the timings. Start closed and gentle, open gradually, finish on real sound.
- 0:45Gentle "mm" siren. Lips together, jaw loose, teeth apart. Hum a soft slide up and down a small range, like a lazy question. Do not chase your top or bottom notes yet.
- 0:45Five-note hum. Hum up five steps and back down, the first five notes of a scale. Move the whole pattern up a step or two, then back. Keep it quiet enough to talk over.
- 0:45Hum into "ng". Hum, then let the lips open into the "ng" of the word sing, keeping the buzz in the same place. This teaches the resonance to stay put when your mouth opens, which is the whole trick.
- 0:30Hum with a jaw release. Hum on one comfortable note and let your jaw hang heavy, waggling it slightly with your hand. A held jaw is the commonest hidden tension in returning singers.
- 0:45Straw hum. Straw between the lips, or into a glass of water. Slide up and down slowly. This is where a tired voice gets most of its recovery.
- 0:45Octave hum slide. Now go further: a slow slide up an octave and back, once or twice. If it breaks in the middle, that is your bridge between chest and head voice, and going gently through it is exactly the right thing to do.
- 0:45Hum, then sing one phrase. Hum the first line of a song you know, then sing the same line on the words at a comfortable volume. This is the handover, and skipping it is why some people warm up and still sound cold.
What each exercise is actually fixing
| Exercise | What it targets | Skip it if |
|---|---|---|
| Gentle "mm" siren | Blood flow and gentle first contact. Wakes the folds without asking anything of them. | Never. This is the one that matters most. |
| Five-note hum | Pitch accuracy and even tone across a small range. | You are very short on time. Fold it into the siren. |
| Hum into "ng" | Keeping resonance forward when the mouth opens. The bridge from exercise to singing. | Nothing. This is the most underrated one on the list. |
| Jaw release hum | Held tension in the jaw, which quietly limits everything above it. | Your jaw is genuinely loose already, which is rarer than you think. |
| Straw hum | Efficiency and recovery. Best value per second of anything here. | You have no straw. Hum with pursed lips instead. |
| Octave slide | Smoothing the passage between registers. | You are hoarse or unwell. Stay in the middle instead. |
| Hum then sing | Carrying the ease of the hum into actual singing. | You are not about to sing. Otherwise, never. |
Four common mistakes, and ten-second fixes
Humming too loudly. A hum that is working is quiet. If you can feel effort in your throat, halve the volume — the exercise gets more effective, not less.
Clenching the teeth. Lips together, teeth apart. Slide a fingertip between your front teeth to check. Most people close the whole mouth and lose most of the benefit.
Chasing the top of your range. A warm-up is not a range test. Stay where it is easy for the first three exercises; the top will come back on its own by exercise six.
Stopping at the hum. Humming warms the voice, then you have to hand that over to real sound. Always finish on one sung phrase or the warm-up does not transfer.
How often, and when to use humming instead of a full warm-up
Before you sing, every time. That is the non-negotiable one, and five minutes is enough for most voices.
Beyond that, humming is the exercise you can do at times when nothing else fits: in the car, at the sink, walking, in the ninety seconds after the house goes quiet. Short and frequent beats long and occasional, because coordination is built by repetition spread across days.
Use humming alone when your voice is tired, when you cannot make noise, or when you have two minutes rather than ten. If you would rather have the timings run for you, I compared the options in the best vocal training apps for women. Use the full vocal warm-up routine when you have the time and the privacy, and pair either with the breathing work underneath, which is what makes long phrases possible.
When humming is not enough
Humming is a warm-up and a recovery tool, not a treatment.
If your voice is hoarse, humming gently and briefly is usually fine and often soothing. But if hoarseness has lasted more than two to three weeks without a cold to explain it, if singing or swallowing hurts, or if your voice keeps giving out, that is a reason to see a doctor rather than to practice harder. Exercises cannot fix things that are not coordination problems.
And if the issue is that you have been away from singing for years rather than that your voice is cold today, the warm-up is only the first step — my four-week plan for starting again after kids puts it inside a structure.
What to remember
Humming works because of pressure, not magic. Closing most of the exit lets your vocal folds do their job efficiently, which is why five quiet minutes beats twenty loud ones for waking a voice up.
Do the seven in order. Keep it quiet. Finish on one sung phrase. And reach for the straw on the days when your voice is tired or the house is asleep.
Sources. 1. Maxfield L, Titze I, Hunter E, Kapsner-Smith M. Intraoral pressures produced by thirteen semi-occluded vocal tract gestures. Logopedics Phoniatrics Vocology, 2015;40(2):86–92. 2. Weitzberg E, Lundberg JON. Humming greatly increases nasal nitric oxide. American Journal of Respiratory and Critical Care Medicine, 2002;166(2):144–145. 3. The Voice Foundation. Understanding voice production.
Frequently asked questions
Do humming exercises actually improve your singing voice?
Yes, as a warm-up and an efficiency trainer. Humming is a semi-occluded vocal tract exercise: partly closing the mouth raises pressure above the vocal folds so they vibrate cleanly at low effort. That improves how easily your voice starts, how even the tone is, and how little you strain. It does not build range or repertoire on its own, so treat it as preparation rather than as the whole practice.
What is straw phonation and why do voice therapists use it?
Straw phonation means humming or singing through a drinking straw, sometimes with the far end in water. It is the strongest of the semi-occluded exercises, because a straw closes the vocal tract further than lips do, which maximizes the helpful back-pressure at the vocal folds. Therapists reach for it because it produces a lot of benefit at very low vocal effort, and because it is almost silent.
How long should I hum before singing?
Five minutes covers most voices. Two minutes is enough on a good day if you keep the order and stay gentle; ten is worth it if you have been away from singing for a while or the day has been long. What matters more than the length is finishing on one sung phrase, so the ease you built in the hum carries over into real sound.
Why does my throat get tight when I hum?
Almost always because you are humming too loudly or clenching your teeth. Halve the volume and check that your lips are together but your teeth are apart, with room for a fingertip. If tightness persists at a quiet volume, drop to a straw with a wider bore, or move down to a comfortable middle note and stay there.
Is humming safe when my voice is hoarse?
Gentle, brief humming is usually fine and often feels better than silence, because it is low-effort. Straw phonation is the gentlest option of all. What is not safe is pushing volume or reaching for high notes on a hoarse voice. If hoarseness lasts beyond two to three weeks without a cold explaining it, see a doctor rather than practicing through it.
Is it true that humming increases nitric oxide?
Yes, and by a lot. A 2002 study measured a roughly fifteen-fold increase in nasal nitric oxide during humming compared with quiet exhalation, because humming rapidly exchanges gas between the nose and the paranasal sinuses. Worth knowing that the study measured gas concentration, not health outcomes, so the wellness claims built on top of it run well ahead of the evidence. Hum for your voice, not for your immune system.
Should I hum through a straw or with closed lips?
Both, and in that order of gentleness. Closed-lip humming is the everyday option and needs no equipment. A straw goes further: it closes the tract more, so it is more efficient and quieter, which makes it the better choice for a tired voice, a late night, or a shared house. Use a wide straw to start and only go narrower if it stays comfortable.
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