A colleague asks if you're okay. You hadn't noticed, but you've been sighing all afternoon: long, heavy breaths between emails and back-to-back calls.
Sighing gets a bad reputation as a sign of boredom or frustration. In fact it's one of your body's smartest built-in tools. Here's what it does and how to use it deliberately.
The short version
Everyone sighs, roughly every few minutes, without noticing. It re-inflates tiny air sacs in the lungs and resets your breathing pattern.
Under mental load, breathing gets shallow and rigid, so sighs become more frequent: it's your body trying to reset.
A deliberate “physiological sigh” (two inhales, one long exhale) is one of the fastest ways to bring your body down.
What's happening in your body
Your lungs contain hundreds of millions of tiny air sacs called alveoli. During normal, shallow breathing, some of them slowly collapse. A sigh is a deeper, double breath that pops them back open. Scientists have even identified the small group of brain cells that triggers it [1].
Sighs also act as a reset for your breathing rhythm. When you're concentrating hard or under pressure, breathing tends to become shallow and stiff. Studies show sighs become more frequent during sustained mental load, and that breathing becomes more variable and relaxed right after a sigh [2]. In other words: the extra sighing isn't the problem. It's your body's attempt at a solution.
Why it happens more at work
Long focus blocks with little movement keep breathing shallow.
Screen time. Many people hold their breath or breathe high in the chest while reading and typing.
Back-to-back meetings leave no natural pauses where breathing could settle on its own.
The tool: the physiological sigh
Inhale through your nose, a full breath.
Without exhaling, take a second, short top-up inhale through the nose.
Exhale slowly through your mouth, letting it run out completely, longer than both inhales together.
Repeat one to three times. For a longer reset, do it for five minutes.
In a Stanford study, people who practised five minutes of this “cyclic sighing” daily for a month had bigger improvements in mood and larger drops in breathing rate than people doing mindfulness meditation [3].
Three more things that help
Use sighs as a signal. If you catch yourself sighing a lot, take that as a cue to stand up, stretch, or step away for two minutes.
Add a breathing gap between calls. Three physiological sighs before you join the next one.
Check your posture. Slumping compresses the belly and makes deep breaths harder.
Common mistakes
Trying to stop yourself sighing. Suppressing it removes your natural reset.
Forcing huge breaths quickly. Over-breathing can make you light-headed. The long, slow exhale is the important part.
Only doing it when things are bad. Practise when calm so it's automatic under pressure.
When to see a doctor
See a doctor if you feel you can't get a satisfying breath most of the time, or if breathlessness comes with chest pain, wheezing, a cough that won't go, swollen ankles, or happens when you exert yourself.
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References
Li P, Janczewski WA, Yackle K, et al. The peptidergic control circuit for sighing. Nature. 2016;530(7590):293-297.
Vlemincx E, Taelman J, De Peuter S, Van Diest I, Van den Bergh O. Sigh rate and respiratory variability during mental load and sustained attention. Psychophysiology. 2011;48(1):117-120.
Balban MY, Neri E, Kogon MM, et al. Brief structured respiration practices enhance mood and reduce physiological arousal. Cell Rep Med. 2023;4(1):100895.
This guide is general information, not medical advice.
