What causes your stomach to growl

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Last updated: April 4, 2026

Quick Answer: Stomach growling, medically known as borborygmi, is primarily caused by the normal muscular contractions of the stomach and intestines. These contractions, called peristalsis, move food, liquids, and gas through the digestive tract, and the resulting sounds are amplified when the tract is empty.

Key Facts

Stomach growling is a normal physiological process called borborygmi.
It's caused by peristalsis, the muscular contractions that move food and gas through the digestive system.
Growling is often louder when the stomach is empty because there's less material to muffle the sounds.
Hunger can increase stomach growling as the brain signals the digestive system to prepare for food.
Certain foods, like those high in carbohydrates or fiber, can lead to increased gas production and thus more growling.

What Causes Stomach Growling?

The familiar rumbling or gurgling sound emanating from your stomach, medically termed borborygmi, is a common and usually harmless bodily function. These sounds are a normal part of digestion and are produced by the movement of gas and fluid through the intestines and stomach. While often associated with hunger, the causes of stomach growling are more complex and relate to the natural workings of your digestive system.

Understanding Peristalsis

The primary driver behind stomach growling is a process called peristalsis. This refers to the involuntary, wave-like muscular contractions that occur throughout the digestive tract, from the esophagus down to the rectum. These contractions serve a crucial purpose: to propel food, liquids, and digestive juices along the digestive pathway, and to mix them thoroughly for efficient digestion and nutrient absorption. Imagine it like a rhythmic squeezing motion that pushes everything forward.

The Role of Hunger

When your stomach has been empty for a while, typically a couple of hours after a meal, your brain sends signals to initiate a process called the "housekeeping wave". This is a series of strong peristaltic contractions designed to sweep any remaining food particles, mucus, and bacteria out of the stomach and into the small intestine. These contractions are often more vigorous than those that occur during digestion, and because there is less food or liquid to cushion the sounds, the noises produced by the movement of air and fluid are more easily heard. This is why stomach growling is most commonly associated with feeling hungry.

Gas and Fluid Movement

The sounds themselves are essentially the noise of gas and fluid being churned and moved through the hollow tubes of your stomach and intestines. When these spaces are filled with food, the sounds are muffled. However, when the digestive tract is relatively empty, the gas and fluid can move more freely, and the contractions of the muscular walls create vibrations that produce the audible growling or rumbling. Think of it like shaking a nearly empty bottle versus a full one – the sounds are much more pronounced when it's not full.

Factors Influencing Growling

While hunger is a common trigger, other factors can contribute to increased stomach growling:

Digestion of Certain Foods: Foods high in carbohydrates, particularly complex carbohydrates and fiber, can take longer to digest and may produce more gas as bacteria in the gut break them down. This increased gas can lead to more audible borborygmi. Sugary foods can also ferment in the gut, leading to gas production.
Swallowing Air: Eating too quickly, chewing gum, drinking carbonated beverages, or smoking can cause you to swallow excess air. This air enters the digestive tract and can contribute to bloating and rumbling sounds.
Indigestion and Digestive Issues: While normal growling is common, persistent or unusually loud growling, especially when accompanied by pain, bloating, diarrhea, or constipation, could indicate an underlying digestive issue such as Irritable Bowel Syndrome (IBS), lactose intolerance, or food sensitivities.
Bowel Obstruction: In rare and serious cases, excessive and loud stomach growling can be a symptom of a bowel obstruction, where the passage of food and waste is blocked. This is usually accompanied by severe pain and vomiting.

When to Be Concerned

Occasional stomach growling is a normal part of digestion and is nothing to worry about. However, if your stomach growling is accompanied by other symptoms such as significant abdominal pain, nausea, vomiting, bloating, changes in bowel habits (diarrhea or constipation), or unintentional weight loss, it is advisable to consult a healthcare professional. These symptoms, in conjunction with excessive growling, might point towards a medical condition that requires diagnosis and treatment.

In summary, your stomach growls because of the normal, rhythmic contractions of your digestive muscles pushing gas and fluid through your intestines. While often a sign that it's time for a meal, it's a fundamental aspect of how your body processes food.