There is a possibility that the gastric mucosa may become cancerous after H. pylori infection, but the chance of cancer is very low, and there is no exact answer as to how long it takes to become cancerous. The infection of H. pylori leads to inflammation of gastric mucosa, then gradually mucosal atrophy, intestinal metaplasia, heterogeneous hyperplasia, and then cancer. H. pylori is a Gram-negative bacillus that requires particularly demanding conditions for survival. It often lives in the pylorus of the human stomach and is one of the most common bacterial pathogens, which is harmful to human health. Some data show that the incidence of atrophic gastritis and gastric cancer is high in people who are first infected with H. pylori at an earlier age, and the mortality rate of H. pylori infection and gastric cancer can be said to show a parallel relationship. Some people usually have bad eating habits, which often lead to problems in the stomach itself, and if combined with H. pylori infection, the stomach will start to suffer from gastritis, gastric ulcer and other diseases, and if they do not know it and do not take care of it, it will cause repeated damage to the gastric mucosa, mucosal atrophy and intestinal hyperplasia, and at the end of the year, anisotropic hyperplasia will occur on top of that before gastric cancer occurs. It is a long process from H. pylori infection to gastric cancer occurrence. Only a small percentage of people will develop cancer. Other adverse factors in the environment and lifestyle can work together differently to cause cancer. In conclusion, although the adverse prognosis of H. pylori infection is gastric cancer, it does not mean that you will definitely get gastric cancer after being infected with it, so there is no need to be afraid of talking about bacteria!