Why does the stomach always purr?

The function of the human stomach is to temporarily store food and preliminarily digest the food in the stomach. The food entering the stomach stimulates the stomach wall to secrete digestive juice. After the digestive juice and food are mixed, they are collectively referred to as stomach contents. At the same time, there are gas entering the stomach with food swallowing. The stomach contents stimulate the stomach wall. When the stomach wall contracts violently, the air in the stomach mixes with the stomach contents. Since the mass of the gas is much lighter than that of the stomach contents, it will produce gasping sound. It sounds like the stomach will emit purring sound. When hungry, the stomach wall contracts more violently, and the purring sound is more obvious. Under normal circumstances, after eating, the sound in the stomach is not heard, when the stomach shows inflammation, the air content in the stomach increases, the sound of purring is more obvious, so you need to go to the hospital for examination and treatment.