This is antral-predominant disease and caused by H. pylori. Often asymptomatic but may be associated with dyspepsia. Atrophic gastritis, gastric atrophy, gastric lymphoid follicles, and gastric B cell lymphomas may occur. Infection early in life or in setting of malnutrition or low gastric acid output is associated with gastritis of entire stomach (including body) and increased risk of gastric cancer. Eradication of H. pylori (Table 147-2) not routinely recommended unless PUD or gastric mucosa-associated lymphoid tissue (MALT) lymphoma is present.