H. pylori is a bacterial infection often associated with stomach ulcers that can increase the risk of a specific type of lymphoma called mucosa-associated lymphoid tissue or MALT lymphoma.
This slow-growing type of non-Hodgkin lymphoma develops in the lymphoid tissue outside the lymph nodes. It most commonly occurs in the stomach, but it can also be found in other parts of the gastrointestinal tract. H. pylori causes chronic inflammation in the stomach, which is thought to increase the risk of this type of lymphoma.

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