Helicobacter pylori may cause cancer. Helicobacter pylori is a kind of bacteria, belongs to Gram-negative flagellated bacillus, often resides in the gastric mucosa after infection, and the toxin it produces can lead to inflammation and even necrosis of the gastric mucosa, and it also affects the secretion of gastric acid, which, if infected with the human body, can cause a series of gastrointestinal diseases, such as gastritis, gastric ulcers, indigestion and so on. About 1% of H. pylori infected people will develop gastric malignant tumors (e.g., gastric cancer, gastric mucosa-associated lymphoid tissue lymphoma), which are classified as class I carcinogens. H. pylori infection can have a variety of symptoms, and it is important to determine the presence of H. pylori infection through professional examination under the guidance of a gastroenterologist. If H. pylori infection exists, standardized treatment is required to eradicate H. pylori infection.