Helicobacter pylori is a pathogen produced in the stomach or oral cavity. It cannot be said that Helicobacter pylori causes any specific symptoms, rather, it is the infection of Helicobacter pylori that leads to a series of diseases presenting symptoms. Some people infected with Helicobacter pylori may not show any symptoms at all. If related diseases occur, such as gastritis or ulcers, symptoms such as acid reflux, heartburn, nausea, and vomiting may appear. Additionally, some patients, like those with refractory iron deficiency anemia or idiopathic thrombocytopenic purpura, may also have conditions associated with Helicobacter pylori infection.