How to practice belly breathing for bloating and distension

Put one hand on your chest and the other on your belly, just above your navel. Take a normal breath. Which hand moves more? If it's the top one, you're breathing mostly with your chest, which is common when you're busy, tense or uncomfortable.

That simple check is the starting point for diaphragmatic breathing, often called belly breathing. It has earned attention in gastroenterology for a surprising reason: in some people, a visibly swollen belly after meals is partly about how the diaphragm and abdominal muscles respond.

Why breathing can affect a bloated belly

When gas builds up in the abdomen, the body normally adjusts to make room. Researchers in Barcelona tested this by adding gas to the colon of 20 people with bloating and 15 healthy people. In the healthy group, the diaphragm relaxed and the front abdominal wall tightened. The people with bloating developed more visible distension, and their diaphragm contracted while one of their abdominal muscles relaxed, the opposite pattern (Villoria et al., 2011).

This reflex is called abdominophrenic dyssynergia. Put simply, the diaphragm pushes down and the belly wall lets go, so your abdomen sticks out further than the gas alone would explain.

What the research on retraining found

The encouraging part is that this reflex appears to be trainable. In a randomized, placebo-controlled trial, 42 patients with visible distension after meals, 36 of them women, received either biofeedback or a placebo capsule. The biofeedback group watched real-time signals from belts around the chest and abdomen, were taught to mobilize the diaphragm and practiced exercises at home three times a day (Barba et al., 2024).

After three sessions over 4 weeks, the biofeedback group's abdominal distension scores dropped by an average of 66%. The placebo group didn't show these improvements (Barba et al., 2024).

The American Gastroenterological Association's 2023 expert review on bloating lists diaphragmatic breathing among the approaches used for this problem, and among the options for a type of repeated belching called supragastric belching (Moshiree et al., 2023).

An honest caveat: the trial used biofeedback equipment and trained clinicians. Practicing on your own is a reasonable, low-risk step, but it hasn't been tested in the same way.

Step by step: basic belly breathing

1. Get comfortable. Sit upright in a chair with your feet flat on the floor, or lie on your back with your knees bent.
2. Place your hands. Rest one hand on your upper chest and the other on your belly, just below your ribs.
3. Breathe in slowly through your nose for about 4 seconds. Let your lower hand rise while the hand on your chest stays fairly still.
4. Breathe out slowly through gently pursed lips for about 6 seconds. Let your belly draw back in naturally as the air leaves.
5. Keep your shoulders and chest quiet. If your chest is doing most of the work, slow down and make the breath smaller.
6. Repeat for about 5 minutes. If you feel lightheaded, return to normal breathing for a moment.

Learn the pattern on a calm evening first. It's much harder to pick up a new skill in the middle of a flare.

How to fit it around meals

• Before eating: a minute or two of slow breathing can help you start the meal less rushed.
• After a meal that usually sets off distension: sit upright and spend 3 to 5 minutes on slow belly breathing with long, relaxed exhales.
• Three short sessions a day: that was the home practice schedule in the trial (Barba et al., 2024), and it's a useful benchmark for building the habit.
• Give it a few weeks. The trial ran for 4 weeks, so judge your results over a similar stretch rather than a single day.

Breathing may help beyond bloating

Two other small trials hint at wider benefits. In 19 people with reflux, 4 weeks of breathing exercises designed to train the diaphragm reduced the time the esophagus was exposed to acid and improved quality of life, while the control group didn't change (Eherer et al., 2012).

And in 40 healthy adults, 8 weeks of diaphragmatic breathing training reduced negative mood and lowered cortisol, a stress hormone, while cortisol in the control group didn't change (Ma et al., 2017). These are small studies, so they're encouraging rather than conclusive.

When to see a doctor

Belly breathing is low-risk, but it isn't a substitute for a diagnosis. Get checked if your bloating is new and happens most days, especially with early fullness, pelvic pain or urinary urgency, or if you have blood in your stool, unexplained weight loss, anemia, persistent vomiting or trouble swallowing. If visible distension after meals is a daily problem, ask whether a gastroenterologist or a pelvic floor physical therapist could help.

Sources

1. Villoria A, Azpiroz F, Burri E, Cisternas D, Soldevilla A, Malagelada JR. Abdomino-phrenic dyssynergia in patients with abdominal bloating and distension. Am J Gastroenterol. 2011;106(5):815-9. PMID 21540894
2. Barba E, Livovsky DM, Accarino A, Azpiroz F. Thoracoabdominal wall motion-guided biofeedback treatment of abdominal distention: a randomized placebo-controlled trial. Gastroenterology. 2024;167(3):538-546.e1. PMID 38467383
3. Moshiree B, Drossman D, Shaukat A. AGA clinical practice update on evaluation and management of belching, abdominal bloating, and distention: expert review. Gastroenterology. 2023;165(3):791-800.e3. PMID 37452811
4. Eherer AJ, Netolitzky F, Högenauer C, et al. Positive effect of abdominal breathing exercise on gastroesophageal reflux disease: a randomized, controlled study. Am J Gastroenterol. 2012;107(3):372-8. PMID 22146488
5. Ma X, Yue ZQ, Gong ZQ, et al. The effect of diaphragmatic breathing on attention, negative affect and stress in healthy adults. Front Psychol. 2017;8:874. PMID 28626434

This article is for general information and isn't medical advice. Talk to your healthcare provider about bloating or distension that is new, frequent or getting worse.