Relationship between helicobacter pylori bacteria and stomach ulcers?

H. pylori & ulcers: An estimated 2/3 of people have h. Pylori bacteria, but most of them never have any symptoms. However, h. Pylori is a major cause of peptic ulcers (>90% of duodenal ulcers, an estimated 60% of gastric ulcers). Nobody knows why some people with h. Pylori get ulcers but others don't.

Causative : Hpylori greatly increases one's risk for ulcer.