Helicobacter pylori does not tend to cause mouth ulcers, but there is a relationship between some mouth ulcers and H. pylori infection. H. pylori often causes ulcers to develop in the digestive tract when it infects the digestive tract, causing symptoms such as acid reflux and heartburn, nausea and vomiting, and indigestion in patients. H. pylori may return up with the patient’s vomit and colonize the mouth, where it may multiply in large numbers and cause the patient to develop mouth ulcers. However, most mouth ulcers are caused by vitamin deficiencies; or bacterial colonization after the oral mucosa is broken. It is not closely related to H. pylori infection, and only a small percentage of patients may develop mouth ulcers due to H. pylori infection. When patients have mouth ulcers, it is best to go to the hospital for a checkup and then be treated under the guidance of a doctor.