Autoimmune gastritis

/ˌɔːtəʊɪmjˈuːn ɡastɹˈaɪtɪs/

/ˌɔːɾoʊɪmjˈuːn ɡæstɹˈaɪɾɪs/

immune system attack on the stomach lining, causing inflammation, impaired acid production, and related symptoms