Why Can I Hear Liquid Sloshing in My Stomach?

The sloshing you hear is your stomach’s muscular walls squeezing and churning a mix of liquid, food, and trapped air. Doctors call these rumbling, gurgling noises borborygmi, and they are a routine byproduct of digestion happening all day long, not just when you feel hungry.¹ The sound gets louder under some conditions and softer under others, and understanding those conditions explains why some days you feel like a half-full water bottle and other days you barely notice anything at all.

What Creates the Sloshing Sound

Your stomach is not a passive storage bag. Its walls contain layers of muscle that contract in rhythmic waves called peristalsis, pushing contents downward toward the small intestine. When a peristaltic wave reaches the lower part of the stomach near the exit valve, much of the material gets pushed backward in what researchers call retropulsive flow. That back-and-forth action is what actually mixes your food, drink, and digestive juices together.² The sound you hear comes from air and gas pockets getting caught up in that churning liquid. Think of it like shaking a bottle that has both water and air in it. The sloshing noise is the air being forced through and around the liquid as the stomach muscles squeeze.

The intensity of mixing depends partly on how watery or thick the stomach contents are. Thinner, more liquid contents create stronger turbulence during those peristaltic contractions, with flow separating and swirling behind each wave of muscle contraction.² That turbulence is more audible. A stomach full of thick porridge generates less dramatic sloshing than one full of water and air. This is why you tend to hear the sound more clearly after drinking a glass of water on a mostly empty stomach, or after a light liquid meal, than after eating something dense and starchy.

Your Stomach Is Never Truly Empty

Even when you have not eaten or drunk anything for hours, your stomach still contains some fluid. Digestive secretions, including stomach acid and mucus, accumulate continuously. MRI-based studies have measured this resting volume at roughly 25 to 35 milliliters in fasting adults, with considerable person-to-person variation.³⁴ That is only a few tablespoons, but it is enough liquid for peristaltic contractions to push around audibly, especially when there is swallowed air in the mix.

When you do drink something, the stomach empties surprisingly fast. After swallowing about 240 milliliters of water (roughly one cup), about 85 percent of the total volume leaves the stomach within 30 minutes.⁴ So the window during which you have a significant volume of free liquid sloshing around is actually quite short after a drink. After that, you are back to the baseline pool of secretions. If the sloshing persists for a long time after eating or drinking, that can mean emptying has slowed for some reason, which we will get to later.

Why an Empty Stomach Is the Loudest

Most people notice stomach noises more when they are hungry, and there is a straightforward reason for that. Between meals, the stomach and small intestine go through a cyclical pattern of strong contractions designed to sweep residual food particles, mucus, and bacteria downstream. These housekeeping contractions are more vigorous than the gentler mixing waves that happen while you are digesting a full meal. They churn the small amount of residual fluid and pockets of air with real force, producing the classic growling or sloshing sound.

There is also less material in the stomach to absorb the noise. A full stomach muffles sound in the same way a full suitcase does not rattle like a half-empty one. The air-to-liquid ratio matters too. During a fasting state, swallowed air sits in a relatively empty chamber alongside a thin layer of digestive juice, creating ideal conditions for audible turbulence. One research group studying bowel sounds found that sound activity noticeably increased about an hour after eating, consistent with the early phases of active digestion, then shifted in character as more gas-dominant movements took over later.⁵ The take-home point: your gut is noisiest during transitions, either ramping up digestion or cleaning house between meals.

How Body Position Changes Things

If you have ever noticed that the sloshing is louder when you sit up or stand compared to lying down, you are not imagining it. Gravity changes where the liquid and gas settle inside your stomach. When you stand, liquid pools at the bottom while air rises to the top, and peristaltic waves push through this layered arrangement. When you lie down, the contents distribute more evenly along the stomach’s length, and the sound may change or diminish.

A striking clinical case illustrated this perfectly. A young, thin woman experienced persistent loud abdominal sounds that were audible only when she was sitting or standing. The sounds disappeared when she lay down. Imaging revealed that her stomach took on an hourglass shape while upright, likely due to compression by the rib cage, but appeared completely normal when she was lying flat.⁶ Her sounds got louder after heavy meals and during deep breaths, and she could reduce them by pressing on her abdomen or holding her breath. This is an unusual case, but it highlights how much anatomy and posture influence what you hear. People with a thinner build have less tissue between the stomach and the skin surface, which makes internal sounds travel outward more easily.

Exercise and “Slosh Stomach”

Runners and endurance athletes have a name for the uncomfortable sensation of liquid bouncing around in the stomach during exercise: slosh stomach. The repetitive up-and-down impact of running physically jostles the stomach’s contents in a way that sitting at a desk never does, turning the normal fluid inside into something you can both feel and hear.

But slosh stomach is not just about mechanical bouncing. During intense exercise, your body diverts blood away from the digestive organs and toward the working muscles. That reduced blood flow to the gut slows gastric emptying, meaning liquid stays in the stomach longer than it normally would. Researchers have described this as exercise-associated gastroparesis, and it can leave athletes feeling nauseated and bloated as fluid accumulates.⁷ Electrolyte imbalances from excessive fluid intake during long events can make it worse. If you regularly hear or feel sloshing during workouts, the practical fix is often to take smaller, more frequent sips rather than gulping a large volume before heading out.

Foods and Drinks That Make It Worse

What you consume affects both how much liquid ends up in your gut and how much gas is produced alongside it, and both of those factors influence how much sloshing you hear.

Carbonated drinks are an obvious candidate. Sparkling water and sodas deliver dissolved carbon dioxide directly into the stomach, where it comes out of solution as gas. That extra gas gives the peristaltic waves more air to push through the liquid, potentially amplifying the noise. Interestingly, research on carbonated beverages and digestion has produced mixed findings. One study found that 300 milliliters of sweetened carbonated drinks at various carbonation levels did not significantly alter gastric emptying or upper-digestive-tract physiology in healthy people.⁸ However, a separate trial found that carbonated soft drinks produced better gastric filling and distension than plain water, with a higher percentage of patients reaching full stomach distension in the first few minutes after consumption.⁹ The picture seems to be that carbonation adds volume and gas to the stomach temporarily but does not necessarily slow down how quickly things move through. The noise effect, in other words, is real but short-lived.

A group of carbohydrates known as FODMAPs plays a different role. These are sugars and fibers found in foods like onions, garlic, wheat, beans, apples, and many dairy products. They are poorly absorbed in the small intestine, which means they pull extra water into the gut by osmotic effect and then get fermented by bacteria in the large intestine, producing gas.¹⁰ The combination of increased water and increased gas means more raw material for audible sloshing and gurgling, particularly in the lower intestine. People with irritable bowel syndrome are especially sensitive to FODMAPs, but even people without a diagnosed condition can notice more gut noise after a high-FODMAP meal.

Even the type of water you drink can matter. A study of patients with functional dyspepsia found that the stomach emptied mineral water roughly twice as fast as ordinary drinking water. By 15 minutes after ingestion, the stomach held only about 8 milliliters of mineral water compared to nearly 59 milliliters of plain drinking water.¹¹ The mineral content appears to stimulate faster gastric emptying, which would shorten the window of audible sloshing. This was studied in people with a specific digestive condition, so the effect in healthy individuals might be smaller, but it is a reminder that not all liquids behave the same way once they reach your stomach.

How Aware You Are of Your Gut Sounds

Not everyone is equally tuned in to their own digestive noises. The ability to perceive internal body signals, including gut sounds, is part of what scientists call interoception, and it varies a lot from person to person. Some people barely register stomach rumbles; others are hyperaware of every gurgle. This is not just about the sounds being physically louder. It is also about how the brain processes and amplifies (or ignores) those signals.

Researchers have begun developing tools to measure gastrointestinal interoception more precisely. One approach asks participants to distinguish between their own recorded gut sounds and someone else’s under different conditions, such as after fasting, after drinking sparkling water, or after consuming a meal.¹² The fact that researchers are studying this at all tells you something: the degree to which you notice your own stomach sloshing is partly a trait of your nervous system, not just a reflection of how much noise your gut is producing. People who are anxious or who focus heavily on bodily sensations tend to notice and worry about gut sounds more, even when the sounds themselves are perfectly normal in volume and frequency.

When Sloshing Could Point to a Problem

For the vast majority of people, hearing liquid in the stomach is simply digestion doing its job. But persistent, pronounced sloshing, especially hours after eating, can sometimes indicate gastroparesis, a condition where the stomach empties abnormally slowly. In gastroparesis, food and liquid sit in the stomach much longer than they should, which means the sloshing window extends well beyond the normal 30 to 60 minutes after a meal. People with gastroparesis often experience nausea, feeling full after just a few bites, bloating, and sometimes vomiting of undigested food.

Gastroparesis has several known causes, including diabetes (which can damage the nerves controlling stomach muscles), certain medications, and prior surgery. But it can also appear without any obvious explanation. A case series described five otherwise healthy young adults who experienced recurring episodes of severe nausea, early fullness, and bloating. During symptomatic periods, imaging showed their stomachs were dilated and not contracting properly. Between episodes, everything looked and functioned normally.¹³ This intermittent pattern is worth knowing about because it means you can have a stomach that empties well on most days but occasionally stalls, producing a stretch of unusual sloshing and discomfort that resolves on its own.

Some red flags that suggest something beyond normal digestion:

Timing: Audible sloshing that persists more than two or three hours after eating or drinking.
Nausea or vomiting: Especially if you vomit food that you ate many hours earlier.
Early fullness: Feeling stuffed after only a few bites at meals, consistently.
Weight loss: Unintentional weight loss alongside persistent gut symptoms.
Pain: Stomach pain that regularly accompanies the sloshing, beyond mild discomfort.

Any of these patterns are worth mentioning to a doctor, who can assess whether gastric emptying is delayed. For isolated sloshing that happens occasionally after a big glass of water or during a run and then resolves within an hour, there is rarely anything to worry about.

Practical Ways to Reduce the Noise

If the sloshing bothers you in social situations or just feels uncomfortable, a few strategies tend to help. Eating smaller, more frequent meals rather than a few large ones keeps the stomach from holding a big pool of liquid at any one time. Chewing food thoroughly before swallowing introduces less air and gives the stomach smaller pieces to work with, reducing turbulence. Drinking fluids between meals rather than with meals prevents the stomach from having to process a large volume of liquid and solid at once.

Avoiding high-FODMAP foods on days when you want a quieter gut can reduce the downstream gas and water production that amplifies lower-intestinal noises. Going easy on carbonated drinks eliminates the extra gas delivery. And if you exercise regularly, experimenting with the timing and volume of fluid intake before and during a workout can make a real difference. Many endurance coaches recommend sipping 100 to 150 milliliters every 15 to 20 minutes during prolonged exercise rather than chugging a full bottle at once.

Posture adjustments help in some cases too. If you notice sloshing more when hunched over at a desk, sitting up straighter can change the way liquid and air arrange themselves in the stomach. For the same reason, a short walk after a large meal promotes gastric emptying more effectively than lying down, which can trap gas in awkward positions.

The Sounds Below Your Stomach

It is worth noting that not every gurgle you hear is actually coming from the stomach. The small intestine and large intestine produce their own sounds as they push contents along, and many of the rumbles people attribute to the stomach actually originate lower in the abdomen. Intestinal sounds tend to be more resonant and prolonged when they involve larger air pockets moving through wider sections of bowel, like the colon. Shorter, click-like sounds come from smaller, more localized movements in the small intestine.⁵

The distinction matters because what you eat affects these regions differently. The stomach responds mostly to volume and liquid consistency, while the intestines respond more to fermentation and gas production from specific foods. So a loud gurgle two hours after a bean-heavy meal is more likely your colon processing fermented residue than your stomach sloshing water around. Paying attention to the timing and location of the sounds, higher and more immediate versus lower and delayed, can give you a better sense of which part of your digestive system is responsible and what, if anything, you might want to adjust in your diet.

1
French’s Index of Differential Diagnosis. French’s Index of Differential Diagnosis
2
PubMed. Relationship between gastric motility and liquid mixing in the stomach
3
PubMed. Quantification of gastrointestinal liquid volumes and distribution following a 240 mL dose of water in the fasted state
4
European Journal of Pharmaceutics and Biopharmaceutics. Interindividual and intraindividual variability of fasted state gastric fluid volume and gastric emptying of water
5
medRxiv. What Your bowel Sounds Can Tell: The Hidden Language of Digestive Health
6
PubMed Central. Unraveling the Mystery of Persistent Positional Borborygmi
7
PubMed Central. Quantifying the “Slosh Stomach”: A Novel Tool for Assessment of Exercise-Associated Gastroparesis Symptoms in Endurance Athletes
8
PubMed. Sweetened carbonated drinks do not alter upper digestive tract physiology in healthy subjects
9
PubMed Central. Carbonated soft drink for gastric preparation for magnetically controlled capsule endoscopy: An open-label randomized controlled trial
10
PubMed Central. The Low FODMAP Diet for Treatment of Irritable Bowel Syndrome and Other Gastrointestinal Disorders
11
Digital Diagnostics. Magnetic resonance imaging as a method for evaluating the effect of drinking mineral water on motor-evacuation function
12
Nature. Rumble Recognition: a gastrointestinal sound discrimination task to measure gastrointestinal interoception
13
The American Journal of Surgery. Idiopathic intermittent gastroparesis and its surgical alleviation