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Slow breathing for stress

Slow breathing, without the hype

What slow breathing does in the body, how to do it, what the research really shows, and where it fits alongside care.

Pharmacist review pending56 verified passagesUpdated 2026-10-22

Two opposite responses

Stress is how your brain and body respond to a challenge. Stress hormones raise your blood pressure, heart rate and blood sugar: the "fight or flight" response.1 Your breathing speeds up and your muscles tense.2

Relaxation techniques aim for the opposite, the relaxation response: slower breathing, lower blood pressure and a reduced heart rate.3 Slow, deep breathing from the belly, also called diaphragmatic breathing, is one of them.5 Many techniques combine breathing with focused attention on pleasant thoughts or images.6

Stress response and relaxation response

An illustration of direction only, based on NCCIH and MedlinePlus descriptions. Not measured values.

Everyday calm

Breathing and heart rate at your usual resting pace.

Heart rateUsual
Breathing rateUsual

Stress response

Heart rate, breathing rate and blood pressure go up; muscles tense.12

Heart rateGoes up
Breathing rateGoes up

Relaxation response

Slower breathing, lower blood pressure, reduced heart rate.3

Heart rateSlows
Breathing rateSlower
Slow, deep breathing is one way to bring on the relaxation response.5

How to do it

The NHS describes a calming breathing technique for stress, anxiety and panic that takes a few minutes and can be done anywhere. It helps most when you do it regularly, as part of your daily routine.18

The NHS calming breath

Takes a few minutes and can be done anywhere.18

  1. Get comfortable

    Stand, sit with your back supported, or lie down. Loosen tight clothes.19

  2. Breathe into your belly

    As deep as is comfortable, without forcing. In through the nose, out through the mouth.20

  3. Count gently

    In for a count of 1 to 5, out for 1 to 5, if counting helps.21

  4. Keep going

    At least 5 minutes, ideally as part of your daily routine.1821

  • Stand, sit with your back supported, or lie down; loosen tight clothes.19
  • Let the breath flow into your belly without forcing it; in through the nose, out through the mouth.20
  • Count 1 to 5 in and 1 to 5 out if it helps. You may not reach 5 at first.21
  • Keep going for at least 5 minutes.21
If you feel dizzy or uncomfortable, stop and return to normal breathing. Occasionally relaxation brings more anxiety or intrusive thoughts;13 if so, mention it to your clinician.

What the research shows

A 2019 review of 3 studies with 880 participants found preliminary evidence that diaphragmatic breathing may help reduce stress.8 Another 2019 review of 17 studies found that slow breathing led to a modest drop in blood pressure, but the studies were short, at high risk of bias, and did not look at outcomes such as stroke or heart attack.9

How many people the main reviews included

Blood pressure, 17 studies9
1165Participants
Stress, 3 studies8
880Participants
Anxiety disorders, 16 studies11
856Participants

Who was studied, and what they did

  • Blood pressure: 1,165 participants practicing slow breathing exercises; short follow-up and high risk of bias.9
  • Stress: 880 participants doing diaphragmatic breathing exercises; evidence called preliminary.8
  • Anxiety disorders: 856 people with generalized anxiety, social anxiety or panic disorder receiving relaxation therapy.11
  • Countries and study lengths are not given on the NCCIH page.

Results from research reviews in these participants, not a description of a ProperHealth or Clarkson service.

Participant totals as reported by NCCIH. Small, short studies are one reason the claims stay modest.

In people with anxiety disorders, a 2018 review found relaxation therapy reduced symptoms of anxiety and worry.11 A larger review found it less effective than cognitive behavioral therapy for PTSD and OCD, and most of those studies had a high risk of bias.12

Keep the claim small. The direction is encouraging; the size of the benefit is uncertain. That is enough to try it, and not enough to treat a disease with it.

Where it fits alongside care

There is no drug to cure stress.4 Some people use yoga, mindfulness or relaxation techniques to release tension.31 NIMH suggests apps with relaxation exercises, such as deep breathing, as one way to cope.22 For high blood pressure, NHLBI lists managing stress as part of a healthy lifestyle,29 alongside, not instead of, your treatment plan.10

Where slow breathing fits

Good uses

  • A stressful moment, anywhere, in a few minutes18
  • A daily routine to ease stress1831
  • As one part of CBT-I for insomnia1617

Not a replacement

  • For a treatment plan for high blood pressure10
  • For therapy or medication when anxiety persists23
  • On its own for sleep problems16

For sleep, relaxation is often one part of CBT-I, the recommended insomnia therapy, but on its own it doesn't seem especially promising.1617 And if stress or anxiety won't go away, it is time to talk to a professional; talk therapy and medication are the main treatments.23

Who should be careful

Relaxation techniques are generally considered safe for healthy people.13 Rarely, they have been reported to cause or worsen symptoms in people with epilepsy, certain psychiatric conditions, or a history of abuse or trauma.14 If that is you, talk with your clinician first.

Long-term stress can harm your health, and it is easy to get used to its symptoms.2426 Severe or long-lasting symptoms of any kind deserve a visit to your provider.15

A historical perspective: Dr. Majid Ali

“Normal breath-in, slow breathe-out”

— Dr. Majid Ali, 23 September 2015

Dr. Ali called his method limbic breathing and taught it for decades: breathe from the abdomen, take a normal breath in and a slow breath out, and practice when calm. The core of it matches what NCCIH describes as slow, deep diaphragmatic breathing.5

He also tied breathing to his own oxygen models and claimed effects on tissue oxygen and disease. The sources used here do not support those claims; they are listed on the sources page.

Historical perspective, not current guidance. Drawn from Dr. Ali's authorized writings in the Clarkson archive. The records used, and the claims we deliberately did not carry, are listed on the sources page.

What to do this week

  1. Try it once today, while calm

    It takes a few minutes and can be done anywhere.18 Practicing on an ordinary day makes it easier to use later.

  2. Breathe into your belly

    Gently, without forcing; in through the nose, out through the mouth.20

  3. Count 1 to 5 in, 1 to 5 out

    Only if counting helps. Keep going for at least 5 minutes.21

  4. Stop if you feel dizzy or uncomfortable

    Return to normal breathing. Tell your clinician if relaxation ever makes you feel worse.13

  5. Keep your treatment plan

    If you have high blood pressure or anxiety, breathing practice is an addition, not a substitute.1023

Nothing here is a reason to stop or change a blood pressure, heart or anxiety medicine because breathing practice helps you feel better.

When to get help now

Each warning sign cites the official guidance behind it. The wording still needs pharmacist sign-off.

  • Thoughts of suicide or of harming yourself — call or text 988 (Suicide & Crisis Lifeline, US) now. In immediate danger, call 911.28
  • Chest pain, pressure or tightness, especially with sweating, nausea or pain spreading to the arm or jaw — call 911.32
  • Breathlessness at rest, or breathlessness that is new or getting worse — see your provider; call 911 if it comes on suddenly or makes it hard to talk. Do not try to breathe through it.3334
  • Fainting, or dizziness that keeps happening during or after breathing exercises — stop and get checked.3536
  • Panic attacks that are frequent, or that you are reorganizing your life around — see a provider; this is treatable.27
  • Waking up gasping or choking at night — ask for a sleep assessment.37

Every numbered marker links to the exact passage it rests on. Check the sources.