Definition: Chronic active gastritis is the inflammation of the stomach characterized by the simultaneous presence of a mononuclear cell infiltrate and neutrophilic polymorphonuclear inflammation.

Because this term may convey an entity (like chronic active hepatitis) rather than a phase of a single disease, it is preferable to use the term active as a descriptor, as in the original Sydney System (e.g., chronic gastritis, active).

Etiology

 Helicobacter infection (Helicobacter gastritis)
 Crohn gastritis (Crohn disease)

Types

 focal active gastritis

See also

 gastric active inflammation (active gastritis)
 gastric acute inflammation (active gastritis)
 gastric inactive inflammation (inactive gastritis)