Belching is the sound of gas inside the stomach coming out of the throat. There are many reasons for belching, such as swallowing too much gas, slowing down of intestinal peristalsis, gastroenteritis, and so on. 1. Swallowing too much gas: such as running with the mouth open to breathe, talking more, nervousness and other reasons lead to swallowing a lot of gas and thus the phenomenon of belching. 2. Slow intestinal peristalsis: many reasons lead to slow intestinal peristalsis, food fermentation in the intestines is excessive, producing too much gas, thus appearing the phenomenon of belching all the time. 3. Gastroenteritis: patients with gastroenteritis may have excessive gas production due to incomplete digestion of food or slowed peristalsis of the gastrointestinal tract, resulting in belching all the time. There are many other reasons for belching, so it is recommended that these patients consult a medical professional to identify the cause and deal with it actively.