Abdominal discomfort characterized by inflammation of the lining of the stomach is termed as gastritis. Gastritis develops due to bacterial infection by H.pylori, long term use of pain relievers, injury to the stomach and increased intake of alcohol. Risk factors for gastritis include stress, old age, bile reflex disease, autoimmune gastritis, pernicious anemia or weakened mucous layer that normally protects stomach from action of acid causes digestive juices to act on stomach resulting in inflammation.
Gastritis can be acute gastritis that develops fast and persists for a short time or chronic gastritis that develops gradually and persists for extended time.