Vagus nerve exercises: what has evidence behind it, and a 5-minute routine

First, what "vagus nerve stimulation" means in medicine

The vagus nerve runs from the brainstem down through the neck to the chest and gut. Doctors do use the phrase "vagus nerve stimulation", and it means something specific: a device implanted under the skin that sends regular, mild electrical pulses along the nerve. The Cleveland Clinic describes it as a treatment approved for add-on care in some forms of epilepsy, long-lasting depression that has not responded to other treatment, and arm weakness after stroke. It also says researchers do not know exactly how it works.

Nothing in this guide does what that device does. When blogs and apps talk about "vagus nerve exercises", they mean ways of breathing, sounding and moving that help your body settle. Calm's own article says "vagus nerve stimulation" is not a precise medical term and that the research is mixed. That is a fair starting point.

What the evidence says, practice by practice

Practice	What you do	What we found	Caution
Cyclic sighing (the physiological sigh)	Two breaths in through the nose, one long breath out through the mouth	Best-supported item here. In a randomized trial (Balban et al., 2023), five minutes a day for about a month improved mood more than mindfulness meditation and lowered breathing rate more	Stop if dizzy
Slow breathing in general	Fewer than about 10 breaths a minute, with a relaxed exhale	A systematic review of 15 studies in healthy people linked it to higher heart rate variability and feelings of relaxation. The review is small and the authors say mechanisms are debated	Do not force deep breaths
Box breathing	Four equal counts: in, hold, out, hold	Included in the same trial, where mood improved, though less than with cyclic sighing	Holds can feel uncomfortable; shorten the counts
Humming or chanting	Hum on a long out-breath	Popular in many guides. It lengthens the exhale, which is the likely useful part. We found no strong trials for more than that	None for most people
Cool water on the face	Splash or hold a cool, damp cloth on the face	Commonly suggested as a quick reset. We did not find solid trials on lasting benefit	Ask a doctor first if you have a heart condition
Gentle yoga, body scan	Slow stretches, or moving attention through the body	Listed by Calm as relaxation options. Evidence varies by practice	Move within comfort

The pattern is clear. The practices with the most behind them all slow the breath and lengthen the exhale. The rest are reasonable, low-risk ways to take a quiet minute.

A five-minute routine built on the best-supported item

1. Sit with your back supported and your feet on the floor. Let your shoulders drop.
2. Breathe in through your nose until your lungs feel comfortably full.
3. Add a small extra sip of air through the nose before you let go.
4. Breathe out slowly through your mouth, as if fogging a window, for longer than you breathed in.
5. Repeat for five minutes, at a pace that feels easy. If you feel lightheaded, stop and breathe normally.

The physiological sigh guide covers the technique and the trial in more detail. If you prefer a count-based pattern, the 4-7-8 guide comes with a free timer.

What to expect

Most studies measure averages across many people, and the changes are modest. A realistic hope is that you feel a little slower and steadier after a few minutes, and that the habit gets easier with practice. Nobody can promise more than that, and these practices are not a treatment for anxiety, panic, sleep problems or any health condition.

Common mistakes

• Breathing too hard. Big, fast breaths can cause dizziness. The aim is slow and soft.
• Forcing long holds. If a hold is uncomfortable, shorten the counts. The ratio matters more than the exact seconds.
• Expecting an instant result. The trial above looked at a daily habit over weeks, not a single session.
• Using it to avoid help. If you feel constantly on edge, have panic attacks, faint, or have chest pain or palpitations, see a doctor or therapist. Breathing practice can sit alongside care but should not replace it.

When to talk to a professional

Talk to a doctor or a qualified mental health professional if your stress or anxiety is persistent, is affecting sleep or work, or comes with physical symptoms such as chest pain, fainting or an irregular heartbeat. If you are in crisis, contact your local emergency number or crisis line.