How to Get Air Out of Your Stomach and Find Relief

Trapped stomach air usually escapes on its own through belching, but when it doesn’t, a few simple strategies can speed the process: changing your body position so the air bubble can rise toward the esophagus, going for a short walk, or practicing slow diaphragmatic breathing. Most stomach gas is just swallowed air, and the discomfort it causes, while sometimes startling, is almost always harmless. The relief strategies that work best depend on why the air is there in the first place, and that part of the story is more interesting than you might expect.

Why Air Builds Up in Your Stomach

Every time you swallow, a small pocket of air travels down with the food or saliva. Impedance monitoring studies show that roughly a third of normal swallows push a measurable slug of air ahead of the food bolus into the stomach.¹ That air accumulates in the upper part of the stomach as a gas bubble. In most people, the body handles this quietly: a valve at the top of the stomach relaxes briefly to let gas vent upward, producing a normal belch you may not even notice.

Problems start when more air enters than the body can vent, or when the venting mechanism itself isn’t working well. Eating quickly, talking while chewing, chewing gum, drinking through a straw, and mouth breathing all increase the volume of swallowed air. In some people, especially those with anxiety, the rate of air swallowing climbs high enough to cause persistent bloating, distension, and discomfort, a pattern called aerophagia.²

How Your Body Normally Releases Stomach Gas

The stomach’s exit door for gas is the lower esophageal sphincter, the ring of muscle where the esophagus meets the stomach. When the stomach stretches enough from accumulated air, the sphincter undergoes what researchers call a transient relaxation, briefly opening to let gas escape upward.³ This is the main mechanism behind an ordinary belch, and it’s triggered by the physical stretch of the stomach wall rather than by conscious effort.⁴

Understanding this helps explain why certain relief strategies work: anything that positions the gas bubble near the sphincter, or gently increases the pressure the bubble exerts on the stomach wall, encourages the sphincter to open and let the air out. When that mechanism fails or when something blocks the gas from reaching the sphincter, the bloating persists.

Positional Tricks That Actually Help

Gas behaves like any trapped bubble: it floats to the highest available point. Classic radiological work confirmed that no matter how the stomach is oriented, the gas bubble always rises to the top.⁵ You can use that physics to your advantage.

Sitting upright or standing straight moves the gas bubble toward the upper part of the stomach, which is where the esophageal sphincter opens. Lying flat or slouching can trap air below the liquid and food in your stomach, making it harder to belch. If you’re lying down and feel bloated, try sitting up and leaning slightly forward with a straight back. Some people find that a gentle upright lean to the left side helps, because the stomach curves to the left and this can position the gas closer to the exit. There’s no large trial on which exact angle is optimal, but the underlying principle is consistent: get the bubble above the food, and it has a clearer path out.

For people who use CPAP machines for sleep apnea, this positional logic is especially relevant. CPAP pushes pressurized air into the airway, and some of that air leaks into the stomach during swallowing. In questionnaire studies, about 45% of CPAP users who experienced bloating said that changing sleeping position was the most common thing they tried for relief.⁶ Raising the head of the bed and avoiding food close to bedtime were also commonly reported strategies.

Walking and Gentle Movement

A short walk after eating is one of the oldest pieces of digestive advice, and there’s real evidence behind it. In a randomized trial of people with functional bloating, light exercise after meals improved symptoms of belching, gas, and bloating to a degree that matched prokinetic medication. For postprandial fullness and bloating specifically, the exercise group actually did better than the medication group.⁷

The key word here is “gentle.” A meta-analysis of exercise and gastric emptying found a clear dose-response pattern: walking sped up how quickly the stomach emptied, while intense exercise like hard cycling actually slowed it down.⁸ So a 10- to 15-minute stroll after a meal is helpful; jumping straight into vigorous exercise is likely to make things worse. Broader systematic review evidence supports the idea that regular moderate-intensity activity, including walking, cycling, and yoga, improves digestive function generally.⁹

Diaphragmatic Breathing and Singing

This one surprises people, but it has some of the strongest evidence of any non-medical intervention. Diaphragmatic breathing, the kind where you breathe slowly and deeply into your belly rather than shallowly into your chest, was tested in a controlled trial for excessive belching. Eighty percent of patients in the breathing group significantly reduced their belching frequency, compared with about 19% who improved on their own. Their belching severity scores dropped by roughly half.¹⁰

The likely mechanism is that slow, controlled diaphragm movement helps stabilize the area around the esophageal sphincter, reducing the involuntary air intake that drives a particular type of belching called supragastric belching (more on that below). The technique is straightforward: breathe in slowly through your nose for about four seconds, letting your abdomen expand rather than your chest. Then exhale slowly through pursed lips for six to eight seconds. Doing this for five to ten minutes during or after a bloating episode can help.

A multicenter randomized trial took this idea further by testing singing therapy against diaphragmatic breathing for people with excessive belching. After one week, the singing group had a higher response rate: about 72% improved compared with about 39% of the breathing group. The benefit held at one-month follow-up as well.¹¹ Singing requires coordinated diaphragm control, sustained exhalation, and focused attention, all of which seem to interrupt habitual air-swallowing patterns. If you feel self-conscious about singing, even humming may engage similar muscles.

What About Carbonated Drinks

This one cuts both ways. Some people reach for a fizzy drink hoping to trigger a burp and relieve the pressure. Others avoid carbonation because they feel it makes things worse. Both reactions have a grain of truth.

Carbonated water introduces dissolved carbon dioxide that comes out of solution as gas in the warm, acidic environment of the stomach. In theory, increasing the gas volume should stretch the stomach wall enough to trigger a sphincter relaxation and produce a relieving belch. And that can work, in small amounts. But research suggests that discomfort from carbonated drinks tends to appear when you drink more than about 300 milliliters at once.¹² Beyond that volume, the added gas may contribute more bloating than it relieves.

There’s also an effect on how food distributes inside the stomach. One study found that carbonated water kept a larger proportion of both solids and liquids in the upper stomach compared with still water, likely because the gas distends the upper stomach and holds the meal there.¹³ If you’re already feeling full and bloated, adding more gas on top of a meal sitting in your upper stomach may not be the relief you’re hoping for. A small sip of sparkling water on an otherwise empty stomach is a different situation from chugging a large soda after a big dinner.

Peppermint Oil and Herbal Remedies

Peppermint tea and peppermint oil capsules are a popular remedy for bloating, and there is a real physiological basis for the relief people report. Peppermint oil relaxes smooth muscle throughout the digestive tract, including the stomach and the lower esophageal sphincter.¹⁴ By easing spasm and tension in the stomach wall, it can help gas move and reduce the crampy discomfort that sometimes accompanies trapped air.

The catch is that the same sphincter relaxation that lets gas escape also lets stomach acid escape. Manometry studies have shown that peppermint oil decreases pressure at the lower esophageal sphincter enough to increase the likelihood of acid reflux.¹⁵ If you already deal with heartburn or gastroesophageal reflux disease, peppermint may relieve bloating while worsening your reflux symptoms. Enteric-coated peppermint oil capsules, which dissolve in the intestine rather than the stomach, are designed to avoid this problem, but they’re more useful for intestinal gas and cramping than for gas trapped in the stomach itself.

Other herbal carminatives like ginger, fennel, and chamomile are widely used for bloating and gas, though the clinical evidence for these is thinner than for peppermint. They likely work through similar smooth-muscle relaxation, and they carry fewer reflux concerns.

Abdominal Massage

Gentle clockwise massage of the abdomen, following the path of the large intestine from lower right to upper right to upper left to lower left, is sometimes recommended by gastroenterologists and physical therapists for gas and bloating. A pilot study in palliative care patients found that abdominal massage helped with release of excessive gas, among other benefits like reduced abdominal pain and improved breathing.¹⁶ This is a small study in a specific population, so the evidence isn’t strong enough to make bold claims. But the technique is safe, costs nothing, and may help move gas through the intestinal tract. For gas trapped specifically in the stomach rather than the intestines, combining massage with an upright position is the more logical approach.

The Anxiety Connection

If you notice that bloating and trapped gas get worse when you’re stressed, that’s not your imagination. Anxiety appears to directly increase the rate at which people swallow air. A study using impedance monitoring found that patients with moderate to severe anxiety swallowed significantly more air than calmer patients with the same digestive complaints.¹⁷ Stress-related behaviors, including mouth breathing, rapid shallow breathing, jaw clenching, and frequent dry swallowing, all push extra air into the stomach.

This creates a frustrating loop: the bloating itself causes discomfort and worry, which increases stress, which increases air swallowing, which increases bloating. Breaking the cycle often requires addressing the anxiety side of the equation directly. The diaphragmatic breathing technique mentioned earlier pulls double duty here by both calming the nervous system and reducing air intake. Regular stress management, whether through exercise, meditation, therapy, or whatever works for you, can reduce chronic gas problems more effectively than any single physical technique.

Two Kinds of Belching, and Why It Matters

Gastroenterologists distinguish between gastric belches, which release air that was actually in the stomach, and supragastric belches, which never involve stomach air at all. In a supragastric belch, air is sucked into the esophagus and immediately expelled before it reaches the stomach. The two look identical to the person experiencing them but have completely different mechanics.¹⁸

This distinction matters because supragastric belching doesn’t actually relieve stomach pressure; it just produces the sensation and sound of a belch. People with excessive supragastric belching often belch dozens or even hundreds of times per day but still feel bloated because the air in their stomach was never the problem. It’s essentially a behavioral pattern, and the treatments are behavioral too. Speech therapy programs designed to help patients become aware of and interrupt the esophageal air-suction habit have shown strong results, with over 80% of patients experiencing substantial improvement over a typical course of about ten sessions.¹⁹

If you find yourself belching frequently but never feeling relieved afterward, supragastric belching is worth considering. It’s often misdiagnosed or dismissed, and people spend years trying dietary changes and antacids that don’t help because the air was never coming from the stomach.

When Reflux Disease Complicates Things

Gastroesophageal reflux disease and trapped stomach air are deeply intertwined. The same sphincter relaxations that let gas vent from the stomach also let acid into the esophagus. In people with GERD, excessive belching, especially the supragastric type, can itself trigger reflux episodes. Supragastric belching can cause typical reflux symptoms like heartburn, regurgitation, and chest pain either by forcing acid upward or by stretching the esophagus.²⁰

Research has also shown that the rate of air swallowing correlates with the size of the gastric air bubble after meals and with the rate of gaseous reflux, but not with acid reflux episodes themselves.²¹ In practical terms, this means that swallowing a lot of air gives you more gas to belch up but doesn’t necessarily mean more acid burning. The two problems coexist but have somewhat independent drivers. If you have both reflux and bloating, strategies that address each separately tend to work better than assuming one treatment will fix both.

CPAP Machines and Trapped Air

People who use continuous positive airway pressure for sleep apnea are uniquely prone to stomach bloating. The pressurized air that keeps the airway open can leak past the esophageal sphincter into the stomach, especially during swallows. Beyond positional changes, one evidence-based option is switching from a fixed-pressure CPAP to an auto-titrating machine (APAP), which adjusts pressure throughout the night and typically delivers lower average pressures. A randomized crossover trial found that APAP significantly reduced bloating, flatulence, and belching compared with fixed-pressure CPAP.²² If you’re using CPAP and wake up feeling like a balloon, this is worth discussing with your sleep specialist.

After Anti-Reflux Surgery

One situation where trapped stomach air becomes a genuinely medical problem is after fundoplication surgery, in which the top of the stomach is wrapped around the lower esophagus to create a tighter valve and prevent reflux. The surgery works well for acid control but can make it physically difficult or impossible to belch. After a full 360-degree wrap (Nissen fundoplication), patients commonly report gas bloat, the uncomfortable feeling of trapped air with no release valve. A study comparing partial and full wraps found that patients who received a partial 270-degree wrap (Toupet fundoplication) had significantly less gas bloat, flatulence, and fullness, and most could still belch afterward. Patients with the full wrap felt significantly impaired by their inability to belch.²³

If you’ve had fundoplication surgery and struggle with trapped gas, many of the strategies in this article still apply, but they work within tighter constraints. Small, frequent meals help reduce the total volume of air entering the stomach at once. Avoiding carbonation, straws, and gum becomes more important when the normal escape route is partially blocked. Walking after meals and staying upright for at least an hour after eating help gas move downward through the intestines instead, since the upward route through the esophagus may be compromised.

Burping a Baby Uses the Same Physics

If you’ve ever burped an infant, you’ve already applied the core principles of getting air out of a stomach. Every popular burping technique, holding the baby upright over a shoulder, sitting them up and supporting the chin, or laying them prone across a lap, relies on gravity to float the swallowed air bubble to the top of the stomach and gentle pressure or patting to encourage the sphincter to release it.²⁴ The over-the-shoulder method remains the most commonly used because it combines an upright position with slight abdominal compression against the adult’s body. For adults, the equivalent is simply sitting up straight and, if needed, gently leaning forward to compress the stomach slightly. The anatomy scales up, but the physics doesn’t change.