It refers to acute or chronic inflammation of the stomach which is often diffuse. It is sometimes sometimes recognized visually at endoscopy. The understanding of gastritis has been greatly enhanced by the recognition of Heliocobacter pylori as the most important cause of chronic gastritis. A variety of agents cause acute gastritis, the unifying aetiological factor being disruption of gastric mucosal barrier.haemorrhagic gastritis and ulceration in stomach. Atrophic gastritis and Menetrier’s disease (hypertrophic gastritis) are the results of the chronic gastritis. Endoscopyic analysis reveals the nature of gastritis when the symptoms are masked Histological inflammation is secondary to this event. Also several viral and fungal infections may produce acute gastritis. Other causes are alcohol, drugs, severe physiological stress, mental stress etc. Acute gastritis may leads in severe condition to acute .