<unk>  occurs when the mucous membrane lining the stomach becomes inflamed. Specifically, the term<unk> ," in this context means damage that is limited to the mucosa (which consists of three distinct layers: The epithelium (in the case of a healthy stomach, this is non-ciliated simple columnar epithelium), basement membrane, and lamina propria). An<unk>  is different from an ulcer. An "ulcer" is an area of damage to the gastrointestinal wall (in this case the gastric wall) that extends deeper through the wall than an<unk>  (an ulcer can extend anywhere from beyond the lamina propria to right through the wall, potentially causing a perforation). See gastrointestinal wall. Some drugs, as tablets, can irritate this mucous membrane, especially drugs taken for arthritis and muscular disorders, steroids, and aspirin. A<unk>  may also occur because of emotional stress, or as a side effect of burns or stomach injuries. See acute gastritis.
Gastric erosion
Gastric volvulus
Perforated ulcer
Evisceration 
Atrophic gastritis
Tropical ulcer
Black stomach
Gastric lymphoma