This Book deals with the overall evaluation of spectrum of light microscopic histopathological changes in gastric mucosa in patient with active chronic gastritis.Also it correlates the bacterial load with the histomorphological changes. Also it deals with the comparison of various stains in identifying H-Pylori, especially by using Light green stain with that of Warthin - Starry Silver stain. To some extent, it has covered the histomorphological changes of esophagus in Hpylori infection.