Several conditions may be precancerous and may increase the risk of stomach cancer. They include: Atrophic gastritis, chronic gastritis (inflammation of the stomach lining), and infection by a certain type of bacteria. Pernicious anemia: a chronic vitamin-B12 deficiency anemia that occurs in older adults characterized by numbness and tingling in the extremities. Achlorhydria: low levels or absence of hydrochloric acid in gastric juice.
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