Diaphragmatic Breathing
Reviewed by Dr. Nicholas Gehle, Psy.D., licensed clinical psychologist (FL PY8489) · Updated
Somewhere along the way, most of us forgot how to breathe properly. We take short, shallow breaths from the chest—barely enough to sustain us, never enough to calm us. Diaphragmatic breathing is a return to the way your body was designed to breathe: slow, deep, and from the belly. It is the foundation of nearly every breathing technique, and research shows it can reduce anxiety, lower stress hormones, and restore a sense of calm in just a few minutes.
What is Diaphragmatic Breathing?
Diaphragmatic breathing—also called belly breathing or abdominal breathing—is a technique that trains you to breathe using your diaphragm, the dome-shaped muscle that sits at the base of your lungs. When you breathe diaphragmatically, your belly expands outward on the inhale and draws inward on the exhale, while your chest remains relatively still.
This is how newborns breathe naturally. Watch a baby sleep and you will see their belly rising and falling with each breath. But as we grow older, stress, poor posture, and sedentary habits cause most of us to shift to shallow chest breathing—using the smaller intercostal muscles between the ribs rather than the powerful diaphragm below them.
Diaphragmatic breathing is one of the oldest and most widely studied relaxation techniques in existence. Variations appear in ancient yoga practices (pranayama), traditional Chinese medicine (qigong), and modern clinical psychology. Today, it is taught in hospitals, therapy offices, and military training programs as a frontline tool for managing stress, anxiety, and chronic pain.
Why Diaphragmatic Breathing Works
The Science Behind It
Slow, deep belly breathing is linked to higher heart rate variability, a marker tied to the vagus nerve. The vagus nerve runs from your brainstem through your abdomen. It is a main pathway of your body's "rest and digest" system.
When you breathe from your chest, the breaths are rapid and shallow. Your brain interprets this pattern as a signal that something is wrong, keeping the sympathetic nervous system (fight-or-flight) engaged. Diaphragmatic breathing reverses this signal. By slowing the breath to roughly 6 breaths per minute, you increase heart rate variability (HRV)—a key marker of nervous system flexibility and resilience.
A 2017 study by Ma and colleagues trained 40 healthy adults in slow belly breathing for 20 sessions over eight weeks. Compared with a control group, the breathing group showed better sustained attention and lower cortisol (a stress hormone) afterward. It was one small study. Participants also reported meaningful decreases in negative affect—the persistent feeling of unease, irritability, or low mood that often accompanies chronic stress.
"Diaphragmatic breathing could improve sustained attention, affect, and cortisol levels."
— Ma et al., Frontiers in Psychology, 2017
Key Benefits
- May lower stress hormones Slow belly breathing is linked to a lower heart rate and higher heart rate variability. In one eight-week study, cortisol was also lower after training (Ma et al., 2017).
- May ease anxiety and low mood Research shows consistent practice decreases feelings of unease, irritability, and emotional reactivity over time.
- Improves focus and sustained attention Some people find that slowing their breath makes it easier to think clearly. In one study, sustained attention improved after eight weeks of practice (Ma et al., 2017).
- Builds a foundation for all breathing techniques Box breathing, 4-7-8 breathing, and other patterns all rely on diaphragmatic engagement. Master this, and every other technique becomes more effective.
- Linked to lower resting heart rate Systematic reviews confirm that regular practice produces measurable reductions in resting heart rate and blood pressure.
How to Do Diaphragmatic Breathing: Step-by-Step
You can practice diaphragmatic breathing seated or lying down. If you are new to the technique, lying on your back with your knees bent is often the easiest starting position because gravity helps the diaphragm engage naturally.
Step 1: Find a comfortable position
Sit in a supportive chair with your feet flat on the floor, or lie on your back with your knees bent and a pillow under your head. Let your shoulders drop away from your ears. Relax your jaw. The goal is a position where your belly can move freely without restriction.
Step 2: Place your hands
Put one hand on your upper chest and the other on your belly, just below your rib cage. These hands become your feedback sensors—they will tell you whether you are breathing from the right place. Throughout the exercise, your chest hand should remain as still as possible while your belly hand rises and falls.
Step 3: Inhale slowly through your nose
Breathe in gently through your nose for about 4 seconds. Focus on directing the air downward so your belly rises into your lower hand. Imagine you are filling a balloon in your abdomen. Your chest hand should stay as still as possible—if it rises, you are using your chest muscles instead of your diaphragm.
Step 4: Exhale slowly through pursed lips
Purse your lips as if you are about to whistle or blow through a straw. Exhale slowly and steadily for 4-6 seconds, feeling your belly fall back toward your spine. The pursed lips create gentle resistance, which helps you control the exhale and keeps the airways open longer.
Step 5: Continue for 5-7 minutes
Repeat this cycle at a comfortable pace—roughly 6-10 breaths per minute. There is no need to count rigidly. Let each breath flow naturally, keeping your focus on the gentle rise and fall of your belly. With each exhale, allow your body to settle deeper into relaxation.
Practice with Guided Timing
Try diaphragmatic breathing with our guided audio cues and visual pacer in the Strua app.
Try Diaphragmatic BreathingWhen to Use Diaphragmatic Breathing
Best Situations
Diaphragmatic breathing is uniquely versatile because it works both as an acute intervention and as a long-term daily practice:
- As a daily practice: Morning or evening sessions of 5-10 minutes to build baseline calm and retrain your breathing pattern over time
- During stressful moments: When you notice tension building—tight shoulders, clenched jaw, racing thoughts—a few belly breaths can interrupt the stress cycle
- Before sleep: Practiced lying down as part of a wind-down routine, diaphragmatic breathing signals safety to your nervous system and prepares your body for rest
- During physical discomfort: Commonly used in pain management, physical therapy, and respiratory rehabilitation programs
- To build a breathing foundation: If you want to learn box breathing or 4-7-8 breathing, start here—mastering diaphragmatic engagement makes every other technique more effective
When to Choose Something Else
Diaphragmatic breathing is gentle enough for almost anyone, but there are situations where a different technique may serve you better. If you need a more structured rhythm to anchor your focus during acute anxiety, try box breathing with its steady 4-4-4-4 count. If you are struggling to fall asleep and need something specifically designed for sedation, the 4-7-8 breathing technique with its extended exhale may be more effective. And if your anxiety is so intense that focusing on breath feels overwhelming, a body scan or 5-4-3-2-1 grounding technique can help you reconnect with your body before returning to breath work.
Common Mistakes to Avoid
1. Breathing too forcefully
The most common mistake is trying to take the deepest breath possible. Diaphragmatic breathing should feel gentle and natural, not like you are inflating a balloon to bursting. Over-breathing can cause lightheadedness and actually increase anxiety. Aim for a comfortable, moderate breath that feels sustainable for minutes at a time.
2. Pushing the belly out deliberately
Some people force their belly outward by tensing their abdominal muscles rather than letting the diaphragm do the work. The belly should rise passively as the diaphragm contracts and pulls air in—not because you are pushing it out. If you notice your abs working hard, relax them and let the breath be softer.
3. Expecting instant mastery
If you have spent years breathing shallowly from your chest, retraining the diaphragm takes time and practice. Many people feel frustrated after a few attempts because their chest still moves or the technique feels awkward. This is entirely normal. Most people need one to two weeks of daily practice before diaphragmatic breathing starts to feel natural. Be patient with yourself.
What the Research Says
Diaphragmatic breathing is one of the most extensively studied relaxation techniques in behavioral medicine. Multiple randomized controlled trials and systematic reviews confirm its effectiveness for reducing stress, improving autonomic function, and enhancing psychological well-being.
Key Studies
Ma et al., 2017 — Frontiers in Psychology
In a randomized trial with 40 healthy adults, 20 sessions of diaphragmatic breathing over 8 weeks improved sustained attention and lowered cortisol compared with a control group. Negative affect also fell from baseline in the breathing group. It was a small study that used a breathing feedback device.
Hopper et al., 2019 — JBI Database of Systematic Reviews
This systematic review found only three studies that met its criteria. Each reported less stress after diaphragmatic breathing: one on breathing rate and cortisol, one on blood pressure, and one on self-reported stress. The studies were too different to combine, so the evidence is early.
Zaccaro et al., 2018 — Frontiers in Human Neuroscience
A comprehensive review of psycho-physiological correlates of slow breathing found that techniques maintaining 6-10 breaths per minute—the range used in diaphragmatic breathing—enhance autonomic, cerebral, and psychological flexibility. The authors noted improvements in emotional control, attention, and body awareness.
Full References
- Ma, X., Yue, Z. Q., Gong, Z. Q., Zhang, H., Duan, N. Y., Shi, Y. T., Wei, G. X., & Li, Y. F. (2017). The effect of diaphragmatic breathing on attention, negative affect and stress in healthy adults. Frontiers in Psychology, 8, 874. https://doi.org/10.3389/fpsyg.2017.00874
- Hopper, S. I., Murray, S. L., Ferrara, L. R., & Singleton, J. K. (2019). Effectiveness of diaphragmatic breathing for reducing physiological and psychological stress in adults: A quantitative systematic review. JBI Database of Systematic Reviews and Implementation Reports, 17(9), 1855-1876. https://doi.org/10.11124/JBISRIR-2017-003848
- Zaccaro, A., Piarulli, A., Laurino, M., Garbella, E., Menicucci, D., Neri, B., & Gemignani, A. (2018). How breath-control can change your life: A systematic review on psycho-physiological correlates of slow breathing. Frontiers in Human Neuroscience, 12, 353. https://doi.org/10.3389/fnhum.2018.00353
Frequently Asked Questions
How often should I practice diaphragmatic breathing?
For best results, practice for 5-10 minutes two to three times per day. Many people find it helpful to build it into existing routines—morning, lunchtime, and before bed. Consistency matters more than duration. Even 2-3 minutes daily is better than 20 minutes once a week.
Can children do diaphragmatic breathing?
Yes, children can learn diaphragmatic breathing with age-appropriate guidance. For younger children (ages 4-7), try placing a stuffed animal on their belly and asking them to make it rise and fall with their breath. Older children can follow the same hand-placement technique as adults. It is a wonderful tool for managing school anxiety and bedtime restlessness.
What if my chest keeps moving instead of my belly?
This is the most common challenge and it is completely normal. Most adults have spent years breathing shallowly from the chest, so retraining takes patience. Try lying on your back with your knees bent—gravity helps the diaphragm engage. Place a light book on your belly as a visual cue. Start with just 2-3 breaths at a time and build from there.
Is diaphragmatic breathing the same as belly breathing?
Yes, they refer to the same technique. "Belly breathing" is the informal name that describes how your belly rises and falls, while "diaphragmatic breathing" is the clinical term that refers to the diaphragm muscle doing the work. You may also hear it called "abdominal breathing" or "deep breathing." They all describe breathing that engages the diaphragm rather than relying on the chest and shoulder muscles.
Related Techniques
Based on your interest in breathing techniques, you might also try:
Start Practicing Diaphragmatic Breathing
Diaphragmatic breathing is the single most important breathing skill you can learn. It is the foundation that every other technique builds upon, and it is backed by decades of research. Start with 5 minutes today—place your hands, breathe from your belly, and notice how your body responds.
Try Diaphragmatic Breathing