尚没有关于胃炎发病率和患病率的具体数据。 10-20% 服用非甾体抗炎药的患者报告有消化不良症状,但是患病率范围可能为 5-50%。[17]Larkai EN, Smith JL, Lidsky MD, et al. Gastroduodenal mucosa and dyspeptic symptoms in arthritic patients during chronic nonsteroidal anti-inflammatory drug use. Am J Gastroenterol. 1987;82:1153-1158.http://www.ncbi.nlm.nih.gov/pubmed/3499815?tool=bestpractice.com[18]Singh G, Ramey DR, Morfeld D, et al. Gastrointestinal tract complications of nonsteroidal anti-inflammatory drug treatment in rheumatoid arthritis: a prospective observational cohort study. Arch Intern Med. 1996;156:1530-1536.http://www.ncbi.nlm.nih.gov/pubmed/8687261?tool=bestpractice.com 在美国,高达 25% 的患者有消化不良的症状;在转诊至行上消化道内镜检查的患者中,约 50% 被诊断为非溃疡性消化不良(包括胃炎)。[19]El-Serag HB, Talley NJ. Systemic review: the prevalence and clinical course of functional dyspepsia. Aliment Pharmacol Ther. 2004;19:643-654.http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2036.2004.01897.x/fullhttp://www.ncbi.nlm.nih.gov/pubmed/15023166?tool=bestpractice.com 北欧或斯堪的纳维亚血统是自身免疫性胃炎一个已知的危险因素。[10]Kekki M, Siurala M, Varis K, et al. Classification principles and genetics of chronic gastritis. Scand J Gastroenterol Suppl. 1987;141:1-28.http://www.ncbi.nlm.nih.gov/pubmed/3481655?tool=bestpractice.com 幽门螺杆菌感染的患病率在发展中国家较高,且受多种因素影响,包括地域、年龄、菌株毒力、环境因素和社会经济状况。[20]Hunt RH, Xiao SD, Megraud F, et al; World Gastroenterology Organization. Helicobacter pylori in developing countries. World Gastroenterology Organisation Global Guideline. J Gastrointestin Liver Dis. 2011;20:299-304.http://www.ncbi.nlm.nih.gov/pubmed/21961099?tool=bestpractice.com