Gastritis is an inflammation of the stomach lining. Gastritis can be defined as:

  • Acute—comes on suddenly and lasts for a short time
  • Chronic—either long lasting or recurrent

Gastritis can be erosive. Erosive gastritis can wear away the lining of the stomach. It may also cause ulcers and bleeding.

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, orsarcoidosis
  • Pernicious anemia, a cause of autoimmune gastritis
  • Radiation treatment
  • Swallowing caustic substances