Epidemiology
Data for the incidence and prevalence of gastritis are not available. Dyspeptic symptoms affect up to 25% of the population of the United States; nonulcer dyspepsia (including gastritis) contributes to the diagnosis in about 50% of patients referred for upper endoscopy.[17] Dyspeptic symptoms are reported in 10% to 20% of patients taking nonsteroidal anti-inflammatory drugs (NSAIDs), although the prevalence may range from 5% to 50%.[18][19] North European or Scandinavian ancestry is a recognized risk factor for autoimmune gastritis.[10] The prevalence of Helicobacter pylori infection is higher in developing countries and is impacted by a multitude of factors, including geography, age, strain virulence, environmental factors, and socioeconomic status.[20]
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