Duodenitis is an inflammatory disease of the mucous membrane, which ranks second in prevalence among all stomach diseases (after gastritis). Elhama (2006) reports that approximately 25% of the world's population has this pathology (Wally H., Brown G., 2015).
The main mechanism for the occurrence of inflammatory lesions of the esophagus and duodenum remains infection with H. pylori, i.e. at present there is no evidence that duodenitis of a non-infectious nature is an independent disease and manifests itself in a person without any infectious diseases (Irmiyaeva Yu. Yu ., Kiseleva S. M., 1998).
A combination of gastric ulcer and duodenitis is quite common: in 3–5% of patients they are represented by the same organ. There are no differences between the three forms of the disease - Duquenne form, Marie form, Hartier form (Nikitin Yu. P., Litvinenko O. G., Golovko O. A., 2007).