# Gastritis
Common causes of gastritis include: 1. Helicobacter pylori (H. pylori): H. pylori is a bacteria found usually in the mucous lining of the stomach. H.pylori is present in gastric mucosa of most of the human beings and it plays an important role in the natural stomach ecology. However, sometimes it leads to an infection and development of chronic gastritis and in some individuals it progresses to other complications like gastric ulcer, gastric neoplasias and stomach cancer. 2. Pernicious anemia: A type of anemia that occurs when the stomach lacks a naturally occurring substance needed to properly absorb and digest vitamin B12. The loss of ability to absorb vitamin B12 is the most common cause of adult vitamin B12 deficiency. 3. Bile reflux: Backflow of bile into the stomach from the bile tract. Bile tract connects the liver and the gall bladder. Bile is a yellowish fluid produced by the liver that aids in digestion of lipids in the small intestine. Backflow of bile in stomach can have adverse effects .
