Causes
Causes of acute gastritis include:
Nonsteroidal anti-inflammatory drugs (NSAIDs) such as aspirin
Steroid medications
Alcohol use
Smoking
Severe stress from sepsis , burns, or injury
Causes of chronic gastritis include:
Bacterial infection, such as Helicobacter pylori ( H. pylori )
Viral infection
Fungal infection
NSAID use
Alcohol use
Reflux of bile into the stomach
Autoimmune diseases such as Crohns disease , or sarcoidosis
Pernicious anemia , a cause of autoimmune gastritis
Radiation treatment
Swallowing caustic substances
- See more at: http://medicine.med.nyu.edu/conditions-we-treat/conditions/gastritis#causes