Helicobacter pylori is characterized by epigastric distension and pain, bad taste in the mouth, and acid reflux and heartburn. 1. Epigastric distension and pain: if the patient is infected with Helicobacter pylori, it may show the problem of epigastric pain, which is mostly manifested in the increase of gastric acid secretion, which damages the gastric mucous membrane barrier, and Helicobacter pylori will reproduce in large quantities, which will make the gastric mucous membrane suffer from different degrees of damage, and finally form gastric ulcers, which will cause the epigastric pain immediately. 2. Oral odor: Generally, H. pylori will survive in dental plaque and directly produce smelly carbons, leading to the problem of bad breath. 3. Acid reflux and heartburn: when the patient is infected with H. pylori, H. pylori induces the crazy secretion of gastrin, and acid reflux and heartburn occurs. In addition, can not be ignored is that some patients infected with H. pylori will have systemic symptoms such as fatigue, anemia, and even emaciation and other symptoms, should be timely medical treatment, not to delay the best time.