The most common cause of atrophic gastritis is infection by Helicobacter pylori, which can colonize the gastric mucosa and cause persistent damage to the gastric mucosa. Some patients often do not care about this damage or do not detect it at an early stage, thus causing the mucosa to gradually become red, swollen, erosion, bleeding, and even atrophy and metaplasia, so it is recommended that if you have similar symptoms of epigastric discomfort, it is recommended that you must be examined for this type of bacteria and treated for bacterial killing. In addition, the causes that can lead to atrophic gastritis are most related to diet, for example, some patients consume greasy, spicy, irritating food, cold food or unclean diet for a long time, which may induce erosion, atrophy, chemosis and other related conditions of the gastric mucosa. Therefore, diet and H. pylori related conditions are the two most common causes of atrophic gastritis. In addition, you also need to pay attention to adjusting your emotions and not to stress yourself out too much.