Introduction. In various physiological and pathological conditions, the gastroesophageal junction (GEJ) can migrate suprahiatally. The range of reversible displacement of the suprahiatal GEJ is different. From this point of view, there are 3 anatomical-physiological situations: (1) reversible physiological migration of suprahiatal GEJ, (2) excessive (pathological) migration of suprahiatal GEJ and (3) reversible hiatal hernias. The differentiation of these situations is not well clarified. The objective of the present study was the endoscopic evaluation of the rate of causalassociated pathology as a criterion for differentiating the above situations, depending on the diapason and the type of suprahiatal GEJ migration. Material and methods. 470 cases of migration of GEJ through the hiatal orifice into the posterior mediastinum (suprahiatal) were analyzed endoscopically (proendoscopy and retroflexion of the stomach endoscope). The investigations were performed by an endoscopist. The Olympus Exera III GIF HQ190 endoscopic complex was used. The methodology of endoscopic measurements and the determination criteria for the associated pathology were unique for all patients. Causal-associated pathology was considered erosive reflux esophagitis, post-erosive and post-reflux scarring sequelae, esophageal columnar metaplasia with gastric metaplasia and Barrett’s esophagus. The rate of associated pathology was calculated according to the “absentpresent” criterion for each patient regardless of the number of associated pathologies and their type. The difference in the rate of pathology associated with suprahiatal GEJ migration was calculated for the groups delimited with the migration height of 0.5 cm, 1.0 cm, 1.5 cm, 2.0 cm, 2.5 cm and 3.0 cm. Results and discussion. Reversible migration of suprahiatal GEJ below 0.5 cm was pathologically-associated in 2.94%. Corresponding to the height of the suprahiatal GEJ migration, the rate of the associated pathology was: for the 0.5 ÷ 0.9 cm range 8.54%, for the 1.0 ÷ 1.4 cm range - 9.20%, for the 1.5 ÷ 1.9 cm range - 10.45%, for the 2.0 ÷ 2.4 cm range - 93.62%, for the 2.5 ÷ 2.9 cm range - 84.5%, for the migration ≥3.0 cm - 87.5%. Thus, two significant points were assessed: the migration below 0.5 cm was causally-pathologically associated with an insignificant rate (2.94%) of reflux pathology and the migration distance of 20 mm was assessed as the point with which it makes the highest difference (10.43% and 93.42%) in causal-pathological association of adjacent tuning forks. Pathologically insignificant associated reversible migration could be considered a physiological limit. The point of significant differentiation of the pathological association in reversible migration of the suprahiatal GEJ could differentiate between the pathological reversible migration of the suprahiatal GEJ and the sliding hiatal hernias, serving the point of imposing indications for surgical treatment. Conclusions. Thus, from an endoscopic point of view, (1) reversible migration of suprahiatal GEJ up to 0.5 cm can be considered a physiological migration. (2) excessive (pathological) reversible migration of the suprahiatal EGJ can be considered the displacement of the GEJ on a tuning fork ≥0.5 cm ÷ ˂2.0 cm, (3) reversible sliding hiatal hernia can be considered the reversible displacement of the suprahiatal GEJ by 20 mm and more.