Stomach growling is the sound of muscular contractions squeezing gas and liquid through your digestive tract, and you can trigger it on purpose by recreating the conditions that make those contractions louder. The rumbling has a medical name, borborygmi, and it’s driven by a cyclical pattern of gut contractions that ramps up when your stomach is empty. By combining a few hours of fasting with specific breathing, air-swallowing, and body-position tricks, most people can coax a growl out reliably enough to impress, annoy, or amuse on cue.
Why Your Stomach Growls in the First Place
The growling sound comes from a cyclical pattern of strong contractions called the migrating motor complex, or MMC. Think of it as your gut’s housekeeping mode: when you haven’t eaten for a while, your stomach and intestines launch waves of muscular squeezing that sweep leftover food particles, mucus, and bacteria downstream. These contractions push pockets of gas and liquid through narrow openings, and the turbulence creates the rumbling you hear.
Two hormones are the main triggers. Motilin drives the MMC’s activity front in the stomach.1PubMed. The activity front of the migrating motor complex of the human stomach but not of the small intestine is motilin-dependent Ghrelin, often called the hunger hormone, works alongside motilin to kick off these contractions and speed up gastric emptying, producing what researchers call “gastric hunger.”2PubMed. Ghrelin and motilin in the gastrointestinal system When these hormones peak between meals, the stage is set for audible gurgling. Everything that follows in this article is about exploiting that stage.
Start With an Empty Stomach
The single most reliable way to make your stomach growl is to not eat for a while. The MMC cycle runs roughly every 90 to 120 minutes during fasting and largely shuts down once food arrives. So if you want growling on demand, you need to time your attempt for a window when your stomach is mostly empty.
For most people, that means waiting at least two to three hours after a light meal, or four or more hours after a heavier one. The contractions tend to be strongest and loudest when the stomach has been cleared of food but still contains some gas and residual liquid. Drinking a glass of plain water after fasting for a few hours can add just enough sloshing material to amplify the sound without signaling the stomach to switch out of housekeeping mode.
Your body’s internal clock plays a role in how active these contractions are. Circadian rhythms regulate gut motility, digestion, and absorption throughout the day.3PubMed Central. Circadian rhythms: a regulator of gastrointestinal health and dysfunction Research in animal models confirms that the time of day and circadian-driven behavior patterns influence how quickly material moves through the GI tract.4PubMed. Radiographic assessment of the impact of sex and the circadian rhythm-dependent behaviour on gastrointestinal transit in the rat Many people notice their stomachs are noisiest in the late morning, particularly if they skipped breakfast, because the MMC has been cycling for hours and motilin and ghrelin levels are peaking. If you’re choosing a time of day to try this, late morning on an empty stomach is a strong bet.
Swallow Air on Purpose
One surprisingly effective trick is deliberate air-swallowing, a behavior called aerophagia. Every time you swallow saliva, a small amount of air goes down with it. When researchers had subjects swallow saliva frequently and then took abdominal X-rays, they found that the repeated swallowing measurably expanded the gas bubble sitting at the top of the stomach.5Journal of Medical and Dental Sciences. X-ray examination of the stomach bubble after frequent experimental swallowing of saliva: the mechanism of aerophagia
You can use this to your advantage. Swallow your saliva rapidly five to ten times in a row. Each swallow sends a small gulp of air into the stomach. As the gas bubble grows, it gives the stomach’s contractions more material to push around, making the resulting sounds louder and more likely to be audible from the outside. Pair this with an already-empty stomach, and you’ve stacked two factors in your favor: strong contractions and a larger pocket of gas for them to move.
A few practical notes on technique. This works best if you keep your mouth closed between swallows and use an exaggerated swallowing motion, almost as if you’re swallowing a large invisible pill each time. Some people find it helpful to tilt their chin down slightly, which changes the angle of the esophagus and may help trap more air per swallow. The results aren’t instant. Give it 30 seconds to a minute after a rapid series of swallows, then sit quietly and wait for the contraction wave to arrive.
Body Position and Breathing
How you sit, stand, or lean can change the shape and tension of your stomach enough to affect whether it produces audible sounds. A case study documented a patient whose stomach sounds were clearly audible while sitting or standing but disappeared completely when lying flat. Imaging showed that in the upright position, the rib cage compressed the stomach into an hourglass shape, while lying down returned the stomach to its normal anatomy. The sounds became more prominent after large meals and during deep inhalation, and they quieted down with breath-holding or when the patient pressed on the abdomen.6PubMed Central. Unraveling the Mystery of Persistent Positional Borborygmi
While that case was more extreme than what most people experience, the underlying physics applies broadly. When you sit upright or lean forward slightly, gravity pools gas and liquid toward the lower part of your stomach while the upper part narrows. Contractions squeezing through that narrowed section are more likely to produce noise. Deep inhalation pushes the diaphragm down against the stomach, temporarily compressing it and forcing contents through a tighter space.
Here’s a technique to try: sit upright in a chair, lean forward slightly, and take a slow, deep breath in through your nose, filling your lungs as much as you can. Hold for a second or two, then release slowly. Repeat several times. The rhythmic compression from your diaphragm can stimulate the stomach wall and amplify any ongoing contractions. If you combine this with air-swallowing and an empty stomach, you’ve created a reasonable approximation of the conditions that produce the loudest growling.
Some people find that gently pressing on the upper abdomen with their hand while leaning forward adds additional compression. This essentially mimics what happens naturally when the rib cage narrows the stomach in an upright position. The pressure can nudge a gas bubble through a tight spot and trigger an audible gurgle.
Carbonated Water and What You Drink
Carbonated water introduces dissolved carbon dioxide directly into your stomach, which releases as gas bubbles once it hits the warm, acidic environment inside. A study comparing carbonated and still water found that carbonation significantly changed how a meal distributed itself inside the stomach, concentrating a higher proportion of both solids and liquids in the upper portion of the stomach.7PubMed. Effect of carbonated water on gastric emptying and intragastric meal distribution That redistribution is essentially what you want when chasing a growl: more gas and liquid sitting in the areas where contractions will squeeze it through a narrowing.
Drinking a small glass of sparkling water on a mostly empty stomach can be one of the fastest ways to generate noise. The CO2 provides an immediate gas supply, and since your stomach is already in housekeeping mode with active MMC contractions, those gas bubbles get pushed around almost right away. You don’t need much. Half a glass is usually plenty.
Plain carbonated water works best for this purpose. Sugary sodas can suppress the MMC because the sugar counts as caloric intake, signaling the stomach to shift from housekeeping mode into digestive mode. Diet sodas with artificial sweeteners are a gray area, since some sweeteners may still trigger gut hormone responses even though they contain no calories. If you want to keep the MMC firing at full strength, stick with plain sparkling or seltzer water.
Putting It All Together
If you’re trying to produce a stomach growl for a specific moment, whether for a prank, a drama class, a social media video, or just personal satisfaction, here’s a practical sequence that stacks the factors discussed above:
- Fast for 2-4 hours: Skip a meal or wait well after your last one. The longer the fast, the stronger the MMC contractions will be.
- Drink sparkling water: About 10 to 15 minutes before your target time, sip a small glass of plain carbonated water. This loads your stomach with gas.
- Swallow air: Do a rapid series of 5 to 10 deliberate swallows to add to the gas bubble.
- Sit upright and lean forward: This positions your stomach for maximum compression by the rib cage.
- Breathe deeply: Take slow, full breaths to press your diaphragm against the stomach. Each deep breath acts like a gentle squeeze.
- Wait and listen: The growl may take 30 seconds to a few minutes. The stomach contracts in waves, not continuously, so patience helps.
Not every attempt will produce a loud growl. The MMC operates on its own schedule, and you can’t force a contraction wave to happen at the exact second you want it. What you can do is create the conditions where a growl is very likely, then wait for the cycle to deliver. Trying this a few times will help you learn your own body’s rhythm and get a feel for how long after fasting your stomach tends to become most active.
Why Some People Growl Louder Than Others
If you’ve ever noticed that your stomach is dramatically loud while a friend’s seems silent even when hungry, body composition is part of the explanation. People with less abdominal fat have less tissue dampening the sound between their stomach and the outside world. Thinner abdominal walls transmit sound more efficiently, which is why lean people often have more audible borborygmi.
Stomach anatomy varies between individuals too. The case report of positional borborygmi described earlier involved a thin-built woman whose rib cage compressed her stomach into an unusual hourglass shape when upright.6PubMed Central. Unraveling the Mystery of Persistent Positional Borborygmi While that degree of compression was unusual, everyone’s stomach sits slightly differently relative to the ribcage, diaphragm, and surrounding organs. These anatomical differences mean the same MMC contractions can produce a loud growl in one person and a barely perceptible murmur in another.
Stress and anxiety also speed up gut activity for some people while slowing it for others. If you’ve ever noticed your stomach going haywire before a presentation, that’s your autonomic nervous system dialing up gut contractions. This variability means that the techniques described above will work better on some days than others, and for some people more easily than for others.
Can You Train Your Gut to Respond
Recent research suggests that people can learn to exert some conscious influence over their gastric rhythm. A randomized controlled study tested gastric biofeedback training, where participants watched a real-time readout of their stomach’s electrical activity and tried to shift it toward a normal rhythm. The training produced a measurable peak in normal gastric rhythm during sessions and a significant reduction in irregular activity over time. Participants also reported feeling more able to handle physical discomfort as sessions progressed.8PubMed Central. Gastric Biofeedback in Virtual Reality: Feasibility, Efficacy and Self-Reported Experience
This is a long way from “growl on command using only your mind.” The biofeedback in the study used specialized equipment that most people will never have access to. But it demonstrates something interesting: the gut isn’t entirely beyond voluntary influence. The practical takeaway is that people who regularly experiment with the fasting, breathing, and positioning techniques may develop a better intuitive sense of when their stomach is primed for noise. Repeated practice builds a kind of body awareness that, while not exactly biofeedback, follows the same principle of learning to notice and influence a process that usually runs on autopilot.
When Frequent Growling Points to Something Else
Occasional stomach growling is completely normal and nothing to worry about. But if your stomach produces loud, persistent sounds regardless of whether you’ve eaten, or if growling comes with pain, bloating, or changes in bowel habits, it could signal something worth investigating. Conditions like irritable bowel syndrome, small intestinal bacterial overgrowth, and partial bowel obstructions can all amplify gut sounds beyond what the normal MMC produces.
Persistent growling that changes dramatically with body position and doesn’t respond to eating sometimes reflects unusual anatomy. The positional borborygmi case described earlier was eventually explained by the patient’s stomach being compressed into an abnormal shape by the rib cage, something visible only on imaging done while the patient was upright.6PubMed Central. Unraveling the Mystery of Persistent Positional Borborygmi Loud growling that happens reliably in one posture but never in another, particularly if it persists for weeks, is the sort of pattern worth mentioning to a doctor. For the vast majority of people, though, growling is just the sound of an empty gut doing routine maintenance, and the techniques in this article work precisely because they amplify that normal process rather than creating something new.