Helicobacter pylori is a gram-negative bacteria that live within the lining of the stomach. The infection is typically spread from person to person. Depending on your ethnicity and where you grew up, there is a chance that you are infected. Most infected individuals do not have symptoms. H. pylori thrive within the lining of the stomach because they produce special enzymes that neutralize the stomach acid. Over time, the bacteria causes inflammation. In a small number of peop