Stomach growling is almost always normal: it is the sound of gas and fluid being squeezed through your stomach and intestines, which are hollow and echo like water pipes[1]. On an empty stomach, most of the noise comes from a strong fasting "cleanup" wave; after meals, it comes from digestion and from gas made by swallowed air and gut bacteria.
Whether you call it a growl, a rumble or a stomach grumble, doctors call these sounds borborygmi, and in a survey of 301 apparently healthy adults they were among the most common gut symptoms reported[2]. Below: why your stomach growls when you are hungry (and when you are not), what makes gurgling louder, what quiets it, and the few combinations that need a doctor.
Get medical help promptly if stomach noises come with severe or worsening belly pain, repeated vomiting, a swollen belly and no gas or stool passing, or blood in your stool. Pain, vomiting and distension together are the classic signs of a bowel obstruction, which is a surgical emergency[3].
What causes stomach growling and belly gurgles?
The noise is made by peristalsis, the coordinated muscle contractions that push food, fluid and gas through the gut[1]. Despite the name, much of it comes from the intestines rather than the stomach[1].
How loud it gets depends on how much gas is in the tube and how hard the muscles are working. Gas gets in two ways: you swallow air, and bacteria in your large intestine make gas as they break down carbohydrates you did not fully digest[4].
| Cause | When it usually happens | What helps |
|---|---|---|
| Fasting "cleanup" wave (migrating motor complex) | Between meals, overnight, before meals | Regular meals; it stops when you eat[5] |
| Active digestion | During and soon after a meal | Nothing needed; it is normal[1] |
| Swallowed air | Gum, fizzy drinks, fast eating, smoking | Slow down, cut gum and carbonation[4] |
| Lactose malabsorption | Within a few hours of dairy | Smaller dairy portions or lactose-free options[6] |
| Sugar alcohols (sorbitol) | Hours after sugar-free sweets or gum | Limit sugar-free products[7] |
| Diarrhea or gut infection | With loose stools | Fluids; see a doctor if it persists[1] |
Why does my stomach growl when I'm hungry?
Hungry growling comes mostly from the migrating motor complex (MMC), a recurring pattern of contractions that sweeps the stomach and small intestine while you are fasting and stops as soon as you eat[5]. It runs in phases, and phase III is a burst of strong contractions that starts in the stomach or upper small intestine and travels downward[5].
That burst is driven largely by the gut hormone motilin, and it tracks hunger closely. In fasting volunteers, hunger ratings averaged 62.5 during a stomach-origin phase III, compared with 27.4 during the quiet phase I[8]. When researchers triggered phase III early with a motilin-like drug, hunger scores jumped from 29.2 to 61.7[8].
Motilin release is now considered a main driver of hunger returning after a meal, alongside ghrelin and other gut hormones[9]. So a growl before lunch is your gut's timer going off, amplified because there is little food to muffle the gas being pushed along.
If your stomach growls, are you hungry? Often, but not always: the same fasting wave runs overnight, which is why a noisy stomach in the morning is common, and food stops it whether or not you felt hungry[5].
Why is my stomach growling if I'm not hungry?
Growling without hunger usually means digestion, extra gas or faster movement, not an empty stomach. Certain foods and habits are the usual triggers:
After eating
Bowel sounds normally increase after a meal because the intestines are working harder[1].
After dairy
Stomach growling or rumbling is on NIDDK's list of lactose intolerance symptoms, usually starting within a few hours of milk products[6]. Undigested lactose reaches the colon, where bacteria turn it into fluid and gas[6]. In one Norwegian case-control study of 187 adults, borborygmi that started within 5 hours of a lactose dose and lasted more than 2 hours strongly pointed to lactose malabsorption (odds ratio 61)[10]. More on that on our lactose intolerance page.
After sugar-free products
Sorbitol, a sweetener in sugar-free gum and sweets, is poorly absorbed. In 30 healthy volunteers, 90% malabsorbed a 10 g dose and 45% had symptoms; after four sorbitol sweets (6.8 g), half had symptoms[7].
From swallowed air
Chewing gum, sucking hard candy, carbonated beverages, eating or drinking fast, smoking and loose dentures all increase swallowed air[4]. Air swallowing on its own is rarely symptomatic, and the fix is behavioral[11]. Our post on why you burp so much covers the upper half of this problem.
Is a noisy gut a healthy gut?
A noisy gut is usually a working gut, but the volume is not a health score. Most bowel sounds simply mean the digestive tract is moving, and quieter sounds are normal during sleep[1].
Sound alone also tells doctors surprisingly little. In a blinded test, 41 clinicians who listened to recordings correctly identified normal bowel sounds only 32% of the time, and obstruction only 22%[12]. In another study, physicians recognized obstruction from sound in 42.1% of recordings[13]. In a small ultrasound study of 16 people, what was heard in one spot did not even match the peristalsis happening underneath[14].
Computer analysis of bowel sounds may change that, but a 2018 systematic review of 14 studies judged none ready for clinical use[15]. What matters is the company the sound keeps: pain, bowel changes, vomiting or bleeding.
Unusual cases exist. One 2025 case report described a thin young woman whose loud gurgling occurred only when sitting or standing; imaging showed her stomach changed shape upright, and no definitive treatment was found[16].
What does the gut microbiome have to do with it?
A lot of the gas behind gurgling is made by microbes. Bacteria in the large intestine ferment carbohydrates that the small intestine did not absorb (lactose, sugar alcohols, some fibers), producing gas as a by-product[4]. How much lactose causes symptoms depends partly on your gut bacteria, gut motility and how sensitive your gut is to that gas[17].
The MMC also matters for microbes. It has long been called the "housekeeper of the gut" because disturbances in it are associated with small intestinal bacterial overgrowth (SIBO)[18].
An absent MMC has been linked to SIBO, gastroparesis and intestinal pseudo-obstruction[5]. SIBO is defined as excess bacteria in the small bowel causing gut symptoms, and it is diagnosed with testing, not by sound[19]. Our optimized gut motility page explains how microbes and their metabolites influence that movement.
Lactose intolerance overlaps with wider FODMAP intolerance in at least half of people with irritable bowel syndrome (IBS)[17]. If gurgling comes with recurring belly pain and changes in bowel habits, that page covers the symptom pattern.
Gurgling with diarrhea, constipation or trapped gas
The symptom that comes with the noise tells you more than the noise does.
What causes stomach sounds and diarrhea?
Loud, hyperactive bowel sounds are expected with diarrhea because the intestines are moving faster[1]. They also occur with infectious enteritis, food allergy, Crohn disease and ulcerative colitis[1]. Lactose malabsorption can cause both rumbling and diarrhea within hours of dairy[6].
Why is my stomach gurgling with bloating and gas?
This pairing points to fermentation or swallowed air. Irritable bowel syndrome, lactose and fructose intolerance and SIBO can all increase gas symptoms[4]. See bloating for the wider list of causes.
Why is my stomach gurgling and I can't poop?
Ordinary constipation usually makes the belly quieter, not louder: reduced or absent bowel sounds often go with constipation and with opioid painkillers such as codeine[1]. Loud rumbling while you cannot pass stool is different, especially with pain or swelling.
Why is my stomach rumbling but I can't fart?
Rumbling with no gas or stool passing, plus pain, vomiting or a swollen belly, is the pattern of a bowel obstruction[3]. In a meta-analysis, abnormal bowel sounds, a distended belly, constipation and previous abdominal surgery were the most useful bedside clues[20]. Adhesions from earlier surgery and hernias are the most common causes[3].
How to stop stomach growling and calm a gurgling belly
You cannot silence a healthy gut, but you can usually turn it down:
- Eat at regular times. Food interrupts the fasting MMC wave behind most hungry growling[5].
- Swallow less air. Cut back on gum, hard candy and fizzy drinks, and eat more slowly[4].
- Test your dairy timing. If rumbling starts within a few hours of dairy and lasts, try lactose-free versions or smaller portions for a week[10][6].
- Check labels for sorbitol. Even a few sugar-free sweets caused symptoms in half of healthy volunteers[7].
- Walk after meals. In healthy adults, mild exercise cleared infused intestinal gas faster than rest[21]. In people with bloating, gas retention fell from 45% at rest to 24% during light pedalling[22].
If gurgling is frequent and comes with high-fiber foods, increase fiber gradually rather than cutting it; our guide to high-fiber foods for constipation shows how.
When to see a doctor (and when to worry about a gurgling stomach)
Stomach noises by themselves rarely need a visit. See a doctor if they come with any of the following[1][4]:
- bleeding from the rectum or black stools
- nausea or vomiting
- diarrhea or constipation that continues
- abdominal pain, or gas symptoms that change suddenly
- weight loss you cannot explain
Go to urgent care or the emergency department for very high-pitched sounds with pain, or sounds that stop entirely after a period of loud activity while pain worsens. These can signal an early obstruction or a strangulated bowel[1].
| Usually normal | Worth checking |
|---|---|
| Growling before meals or overnight | Gurgling with ongoing diarrhea or weight loss |
| Rumbling after a big or gassy meal | High-pitched sounds with cramping pain |
| Gurgling after dairy or sugar-free sweets | Swollen belly, vomiting, no gas or stool |
| Occasional loud noises you can hear | Blood in or on your stool |
Colorectal cancer is not known for causing stomach noises. Its listed symptoms are bowel-habit changes, blood in the stool, persistent pain, unexplained weight loss and anemia, and it often causes none at all, so screening from age 45 is the safeguard[23].
This article is for general educational purposes and is not medical advice. It does not replace an examination: a clinician judges abdominal sounds together with your other symptoms. Talk to a qualified healthcare professional about persistent or worrying gut symptoms, particularly if you are pregnant, immunocompromised, taking prescription medication, or managing a diagnosed condition.
Frequently Asked Questions
Why is my tummy gurgling so loud?
Loud gurgling usually means more gas, more fluid or faster movement in the intestines. Common reasons are an empty stomach between meals, swallowed air from gum or carbonated beverages, and gas made by gut bacteria from lactose, sorbitol or some fibers. Diarrhea and gut infections also make bowel sounds louder. Loud sounds alone are rarely a concern; very high-pitched sounds with cramping pain, vomiting or a swollen belly need prompt medical care.
How do I stop a gurgling stomach with diarrhea?
Gurgling with diarrhea is the sound of the intestines moving faster, so it usually settles when the diarrhea does. Drink enough fluids, and if it follows dairy, try lactose-free options. See a doctor if diarrhea continues, or if there is blood in the stool, fever, vomiting or weight loss, because infections and inflammatory bowel conditions can cause the same pairing.
Are you losing weight if your stomach growls?
No. Growling is the sound of gas and fluid being pushed through your intestines, and it happens whether you are gaining, losing or holding steady. When you are hungry, the noise mostly comes from a recurring wave of contractions that sweeps the empty stomach and small intestine between meals. If you notice frequent growling together with weight loss you cannot explain, that combination is worth raising with a doctor.
Is it good to let your stomach growl?
A growl on its own is neither good nor bad. In fasting volunteers, the strongest hunger ratings lined up with a burst of stomach contractions driven by the hormone motilin, so a hungry growl is mostly a timing signal. Eating usually quiets it because food interrupts that fasting wave. Whether to eat should depend on actually feeling hungry, not on the sound.
Why does my stomach growl at night?
Your gut keeps working while you sleep. Overnight is the longest stretch most people go without food, so the fasting cleanup wave (the migrating motor complex) cycles repeatedly and pushes leftover gas and fluid along. Bowel sounds are normally quieter during sleep, so a noisy night often reflects a late, gassy meal or the quiet room making ordinary sounds easier to notice.
Can stomach noises be a sign of bowel cancer?
Stomach noises are not on the CDC's list of colorectal cancer symptoms. The signs that matter are a change in bowel habits, blood in or on the stool, ongoing diarrhea or constipation, abdominal pain that does not go away, unexplained weight loss and iron-deficiency anemia. Polyps and early cancer often cause no symptoms at all, which is why screening from age 45 matters more than listening to your stomach.
How do I get rid of a water or sloshing sound in my stomach?
Sloshing is liquid and gas moving together through the hollow intestines, which echo much like water pipes. Drinking slowly rather than gulping and avoiding fizzy drinks both reduce the swallowed air that makes the sound louder. A sloshing or splashing sound that comes with vomiting, a swollen belly and no gas or stool passing is different and needs urgent care.
Can other people hear my stomach growling?
Sometimes. Increased (hyperactive) bowel sounds can be loud enough to hear without a stethoscope, especially on an empty stomach or after a large or gassy meal. Eating at regular times, limiting fizzy drinks and gum before meetings, and a short walk after eating are the simplest ways to reduce it.
References
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- National Institute of Diabetes and Digestive and Kidney Diseases. Symptoms & Causes of Gas in the Digestive Tract. NIDDK. 2021. Available at: https://www.niddk.nih.gov/health-information/digestive-diseases/gas-digestive-tract/symptoms-causes ↩
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- National Institute of Diabetes and Digestive and Kidney Diseases. Symptoms & Causes of Lactose Intolerance. NIDDK. 2018. Available at: https://www.niddk.nih.gov/health-information/digestive-diseases/lactose-intolerance/symptoms-causes ↩
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- Tack J, Verbeure W, Mori H, et al.. The gastrointestinal tract in hunger and satiety signalling. United European Gastroenterology Journal. 2021;9(6):727-734. doi:10.1002/ueg2.12097 ↩
- Farup PG, Monsbakken KW, Vandvik PO. Lactose malabsorption in a population with irritable bowel syndrome: prevalence and symptoms. A case-control study. Scandinavian Journal of Gastroenterology. 2004;39(7):645-649. doi:10.1080/00365520410005405 ↩
- Liu K, Walsh E, Katzka D, et al.. Diagnostic and Management Review of Gastric and Supragastric Belching, Aerophagia, and Rumination Syndrome. Clinical Gastroenterology and Hepatology. 2026;24(2):285-295. doi:10.1016/j.cgh.2025.08.012 ↩
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