"The Science Behind Stomach Growling: Explained"
Originally Published 2 years ago — by Livescience.com
Stomach growling, also known as borborygmi, is caused by peristalsis, a series of muscular contractions that propel gas, food, and liquids along the digestive tract. These contractions occur whether the stomach is hungry or full, but are more noticeable when the stomach is empty. The hormone ghrelin triggers feelings of hunger and stimulates peristalsis. Stomach growling can also be caused by incomplete digestion of certain foods or digestive illnesses. Overall, stomach rumbling is a normal and harmless function of the digestive system.