The main causes of stomach bloating, belching and acid reflux are as follows: 1. chronic gastritis. 2. peptic ulcer. 3. functional dyspepsia. In chronic gastritis and peptic ulcer, patients will have symptoms such as abdominal distension, abdominal pain, belching and acid reflux in the abdomen. Peptic ulcers also have rhythmic epigastric pain and other symptoms, functional dyspepsia, usually accompanied by epigastric pain, bloating, acid reflux, belching, the occurrence of these symptoms are not specific, often requiring gastroscopy later to identify. The most common cause is H. pylori infection, so it is best to have a H. pylori test along with the gastroscopy. If the H. pylori test is (+), it is necessary to kill the H. pylori, and then carry out symptomatic treatment after killing the H. pylori, so that the effect will be better.