Chronic gastritis
Chronic gastritis is inflammation of the lining of the stomach that persists for a long time.
Chronic gastritis may be caused by prolonged irritation from the use of nonsteroidal anti-inflammatory drugs (NSAIDs), infection with the bacteria Helicobacter pylori, pernicious anemia (an autoimmune disorder), degeneration of the lining of the stomach from age, or chronic bile reflux.
Kuipers, E. Acid peptic disease. In: Goldman L, Ausiello D. Cecil Textbook of Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 141.