It never happens when the room is noisy. It waits for the quiet moment in a meeting, a lull in a movie, or the pause before grace at dinner. Then your stomach lets out a long, rolling growl that everyone seems to hear.
Here's what's going on. That rumble comes from food, fluid, and gas being pushed through your digestive tract by waves of muscle squeezes called peristalsis. When your stomach is empty, the sound can get louder, because the empty space amplifies the sound of air moving around inside. And here's a twist: a lot of that noise actually comes from the intestines near the stomach, not the stomach itself.
A Noise With a Fancy Name
Doctors call a stomach rumble a borborygmus, or borborygmi if there's more than one. The word goes back through French and Latin to an Ancient Greek term that probably imitated the sound itself. Say it out loud and it almost rumbles.
It goes by plenty of plainer names too, including bowel sounds and abdominal sounds. A doctor can listen to them with a stethoscope, but they're often loud enough to hear without one, as you may have noticed at an awkward moment.
The Gut's Housekeeping Crew
The loudest growls tend to come when you're hungry, and there's a good reason. Between meals, your gut runs a regular cleanup cycle called the migrating motor complex. It sweeps through the stomach and small intestine in waves, pushing along leftover bits that weren't digested, such as fiber.
Researchers have described it as the gut's interdigestive housekeeper. It happens roughly every 90 to 230 minutes between meals, and it's responsible for the rumbling you feel when you're hungry. It also helps move bacteria out of the small intestine and toward the large intestine, where they belong.
The cycle comes in stages. First there's a long quiet stretch that takes up roughly half the time. Then the muscles gradually get busier, building to a burst of peak activity that lasts about 5 to 10 minutes before things settle down again.
This cleanup pattern was discovered in 1969 by Joseph Szurszewski at the Mayo Clinic, who studied it in fasting dogs. He also showed that it stops when a meal arrives. So in a way, eating is what tells the cleaning crew to take a break.
Hunger, Hormones, and Air
Your empty stomach doesn't just make noise. It also releases a hormone called ghrelin, often nicknamed the hunger hormone. Along with the movement of the empty stomach, ghrelin helps create that familiar feeling of being hungry.
Not every rumble is about hunger, though. Swallowing air while you talk, eat, or drink can lead to gurgles further along the digestive tract, and that's typical for most people. Fizzy drinks can do it too, as carbon dioxide bubbles make their way through.
Some foods add to the chorus. When certain carbohydrates aren't fully digested, extra gas can build up in the intestines. Dairy, beans, and high-fiber grains are common examples for some people.
When to Pay Attention
For most of us, a growling stomach is completely normal. In rare cases, unusually loud gut noises can go along with digestive problems, especially when they come with bloating, pain, diarrhea, or constipation. If that sounds familiar, talk to your doctor.
Otherwise, there's no need to be embarrassed. That rumble is just your body doing a little tidying up between meals. The next time it happens in a quiet room, you can smile and blame the housekeeper.
