Why does my stomach growl?

The rumble has a wonderful name, borborygmi, and a mundane cause: the muscular walls of your stomach and intestines are always contracting in waves to move contents along, and when the tract is empty, those contractions slosh air and fluid through a hollow chamber, which resonates loudly with nothing to muffle it. The same process happens after eating too, but a full gut absorbs the sound, so you mostly notice it when empty.

Hunger makes it louder for a specific reason. When the stomach has been empty for a couple of hours, the body triggers a strong cleanup wave called the migrating motor complex, essentially a housekeeping sweep that clears out residual food and bacteria, and this vigorous contraction is what produces the classic pre-lunch growl. So a growling stomach genuinely does often signal hunger, but it is really announcing that your digestive system is scrubbing an empty pipe. Louder-than-usual or painful gurgling with other symptoms can point to gas, food intolerance, or digestive conditions, but the everyday growl is just plumbing doing maintenance.