Endoscopy of Acute Gastritis (Pangastritis) 3 of 10

Gastritis is defined as microscopic inflammation of the stomach and represents a histological not a clinical entity, as the majority of persons with gastric inflammation are completely asymptomatic. A myriad of etiological agents can induce gastritis, but the most common cause is infection by Helicobacter pylori, a bacterium that resides in the mucus gel layer overlying the gastric mucosa.