People with mild symptoms have an excellent prognosis. Approximately 20 percent of patients with serious symptoms of an H. pylori infection will develop the infection again in the future, although ulcers usually heal well with little to no scarring.
Severe infections left untreated can lead to damage to the stomach and upper GI tract, which may be life-threatening. Untreated H. pylori infection can also raise the risk of certain types of stomach cancer, affecting about two percent of people who get the infection.

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