Atrophic autoimmune gastritis (AAG) happens when your autoimmune system attacks your stomach cells. Providers diagnose EMAG and AAG with blood tests and endoscopy. Treatments for EMAG include antibiotics and other medications. Treatments for AAG include vitamin B12 injections and iron infusions.

Called autoimmune gastritis, this type of gastritis occurs when your body attacks the cells that make up your stomach lining. This reaction can wear away at your stomach's protective barrier. Autoimmune gastritis is more common in people with other autoimmune disorders, including Hashimoto's disease and type 1 diabetes.

Autoimmune metaplastic atrophic gastritis is an inherited autoimmune disease that attacks parietal cells, resulting in hypochlorhydria and decreased production of intrinsic factor. Consequences include atrophic gastritis, B12 malabsorption, and, frequently, pernicious anemia. Risk of gastric adenocarcinoma increases 3-fold.