Most patients with H. pylori infection have no obvious clinical symptoms. Some patients with H. pylori infection have the following non-specific symptoms: 1, upper abdominal discomfort, including indigestion, abdominal distension and discomfort, burning sensation behind the sternum and upper abdomen, acid reflux and heartburn, mild nausea and dry vomiting, etc. 2, oral local symptoms, unexplained bad breath, eradication of H. pylori in addition to the mouth and teeth must pay attention to regular cleaning to prevent the oral mucosa bacteria regularly triggered by infection. Symptoms. 3, H. pylori easily accompanied by chronic gastritis especially with erosive gastritis, peptic ulcer and other diseases, there may be gastrointestinal bleeding, abdominal pain, bloating and other symptoms. 4, in addition, a small number of patients with H. pylori infection have intestinal discomfort performance abdominal pain, but the cause and mechanism is not clear.