Symptoms of H. pylori infection can include bloating, nausea, vomiting, and abdominal pain. H. pylori is a gram-negative bacillus, mainly in the form of a spiral or rod, with an extremely strong ability to survive in the strongly acidic environment of the stomach, and is mainly parasitized in the pyloric region of the stomach, but can also be found in the duodenum. The enzyme urease contained in H. pylori can hydrolyze urea to produce ammonia to resist the killing effect of stomach acid. Mild infection of H. pylori can be without any uncomfortable symptoms, but when the number of bacteria is too large, it can lead to gastritis, gastric ulcers and other diseases, with abdominal distension, nausea, vomiting, abdominal pain and other symptoms. Patients suspected of being infected with H. pylori are recommended to complete the C13 or C14 breath test, gastroscopy and other tests to make a clear diagnosis and then carry out targeted treatment.