Deep breathing for anxiety works, but not the way most people do it. The calm is not in the big breath in; it is in the long, slow breath out. A comfortable breath in through the nose for about four seconds, then a soft exhale for about six, repeated for two minutes, slows the heart a little on every exhale and lets the rest of the body follow. If "take a deep breath" has never done much for you, this is probably why: you were putting the effort into the wrong half.

What happens in the body when you breathe out slowly?

Your heart does not beat at one steady rate. It speeds up slightly as you breathe in and slows slightly as you breathe out. That swing is normal, and a 2014 review by Lehrer and Gevirtz describes it in detail. The slowing on the exhale comes from the vagus nerve, the main line of the "rest and digest" side of the nervous system. Make the exhale longer and you give that side more of every breath.

A big, fast breath in does the opposite. It leans on the "get ready" side, and if you take several in a row you can end up light-headed and more anxious than before. So the instruction is not "breathe deeply". It is "breathe slowly, and let the breath out last longer than the breath in".

How do you do deep breathing for anxiety?

  1. Sit with your back supported, or lie down. Let your shoulders and jaw go.
  2. Breathe out first, so you start empty.
  3. Breathe in through your nose for a count of 4. A comfortable breath, not a huge one; your belly should move more than your chest.
  4. Breathe out slowly through your nose or soft lips for a count of 6. Let it be a little lazy, like fogging a window.
  5. Go straight into the next breath in, with no hold.
  6. Continue for about two minutes. Six breaths a minute is roughly where you land.

If 6 feels long, use 4 in and 5 out. The numbers matter less than the shape: out longer than in. If you feel faint or unwell, stop and breathe normally. This is the calm breathing guide in short; the guide has the sources.

What does the research say?

A 2018 systematic review of 15 studies linked breathing slower than 10 breaths a minute with feeling more relaxed and less anxious in healthy people, and the authors say how it works is still debated. In a 2023 randomized study, 108 adults practised 5 minutes a day for a month; the method built around a long exhale, cyclic sighing, showed the largest daily improvement in mood. Both are small. The honest summary is that slow, exhale-led breathing is a reasonable way to help yourself settle, and that it is a calming skill, not medical care for an anxiety disorder.

What are the common mistakes?

  • Filling the lungs to the top. That is the "get ready" breath. Keep the breath in comfortable.
  • Rushing the exhale. The out-breath is the whole point; let it run out slowly.
  • Chest breathing. Put a hand on your belly and let that hand move first.
  • Holding when you are already short of air. Patterns with holds, like box breathing, are for when you are calm enough to count. If you are not, stay with 4 in, 6 out.
  • Stopping after four breaths. One round does little. Give it two minutes.

When is the long exhale the right tool?

When the day has gone fast and your chest feels tight. Before a difficult call. In the ten minutes before sleep, where it pairs well with 4-7-8. When a thought keeps circling. In the first seconds of panic, start with two physiological sighs, then come back to the slow exhale. All of these patterns sit side by side on one page, with a table of which to use when: breathing exercises for anxiety, sleep and stress.

Doing it with Bliss

In CalmSpace.ai, Calm (4 in, 6 out) is one of the five rhythms in Breathe together, where Bliss counts out loud and up to six people can breathe to the same start time from different places. On an iPhone with an Apple Watch, you can let her notice your heartbeat while you talk; when it is climbing she slows down and may suggest a breath, and she never says numbers or anything medical. The companion post, why a longer exhale calms you down, goes a little further into the body.

Questions people ask

Is deep breathing good for anxiety?

Yes, when it is slow and the breath out is longer than the breath in. A 2018 review linked slow breathing with feeling less anxious, though the studies are small. A big, fast breath in can make anxiety worse.

How long should I do deep breathing for anxiety?

About two minutes for the moment, five minutes if you have it. Six breaths a minute is the usual pace.

Why does deep breathing make me dizzy?

Usually because the breath in is too big or too fast, or you are doing several in a row. Make the breath in smaller and the breath out slower. If you feel faint, stop and breathe normally.

Should I breathe through my nose or my mouth?

In through the nose. Out through the nose or soft lips, whichever is more comfortable; the NHS exercise breathes out through the mouth.

CalmSpace.ai is a wellness app, not a medical service, and Bliss is not a therapist. If you are in crisis, contact the crisis line for your country; in the United States, call or text 988.