Uncommon Gastritis Syndromes By Nimish Vakil, MD, University of Wisconsin School of Medicine and Public Health Reviewed / Revised Mar 2023 View Patient Education Ménétrier Disease Eosinophilic Gastritis Mucosa-Associated Lymphoid Tissue (MALT) Lymphoma Gastritis Caused by Systemic Disorders Gastritis Caused by Physical Agents Infectious (Septic) Gastritis Gastritis is inflammation of the gastric mucosa caused by any of several conditions, including Helicobacter pylori infection, drugs (nonsteroidal anti-inflammatory drugs [NSAIDs], alcohol), stress, autoimmune phenomena (atrophic gastritis), and a number of less common disorders.