In general, mouth ulcers are not necessarily related to H. pylori infection. Some patients with H. pylori infection have bad breath, but it is not related to mouth ulcers. H. pylori infection is mainly associated with upper gastrointestinal symptoms, such as dyspepsia, and diseases of the digestive tract, such as chronic gastritis, gastric ulcers, and gastric cancer. If you have recurrent mouth ulcers, it is important to be aware of any immune system disorders, such as systemic lupus erythematosus, vasculitis, and leukoaraiosis. If mouth ulcers recur, it is important to be aware of the possibility of the above immune system disorders, so that timely diagnosis and treatment can be made.