The sounds of stomachs growling are caused by contractions and movement of air and gas; mixed with fluids in the digestive system to make a rumbling, gurgling, or growling sound. This can occur inside the [[stomach_(organ)|stomach]], and also the [[intestines]]. The noises can happen regularly, but are heard louder when the stomach and intestines are empty after several hours without [[eating]], which causes the air and gas pockets to make a more audible growling sound. Stomach growling is translated borborygymi, and indicates [[hungry|hunger]], digestion, or gas moving around inside the belly.

Usually represented in Japanese with the sound "guu" (ぐう).
腹の虫 腹の音