<Ul> <Li> "Gastric Erosion ." Encyclopædia Britannica, Micropaedia . Encyclopædia Britannica Inc., 1998 ed . </Li> </Ul> <Li> "Gastric Erosion ." Encyclopædia Britannica, Micropaedia . Encyclopædia Britannica Inc., 1998 ed . </Li>

Breakdown/erosion of mucous membrane in stomach or upper intestinal tract