Why does your stomach growl?
Your stomach growls because muscles in your digestive system squeeze food, liquid and gas along. The rumbling sound, called borborygmi, is louder when your stomach is empty.
The walls of the stomach and intestines constantly contract in waves, a process called peristalsis, to move contents along. When there is food, it muffles the sound. When the stomach and intestines are mostly empty, the gas and liquid moving through them make louder gurgling and rumbling noises.
About two hours after the stomach empties, a pattern of strong contractions called the migrating motor complex sweeps leftover food and bacteria through the gut. These contractions are a common cause of hunger growls. Hormones like ghrelin, which signal hunger, also increase stomach activity.
Is growling normal?
Stomach growling is normal and healthy. It can also happen after eating, during digestion. Very frequent loud rumbling with pain, bloating or diarrhea may point to problems like food intolerances, and a doctor can help if symptoms continue.
Did You Know?
The word borborygmi comes from Greek and is thought to imitate the rumbling sound itself.
This answer is general information, not medical advice. For a personal health question, talk to a doctor.