Insufficiency of the lower esophageal sphincter--cause of reflux esophagitis.
D004942:Esophagitis, Peptic / Q000503:physiopathology*; D004943:Esophagogastric Junction / Q000503:physiopathology*; D006551:Hernia, Hiatal / Q000503:physiopathology; D006801:Humans; D010528:Peristalsis; D011312:Pressure