Gastritis is swelling of the lining of the stomach. Things like excessive alcohol and/or caffeine consumption, cigarette smoke, prolonged use of non-steroidal anti-inflammatory drugs, also known as NSAIDs, such as aspirin or ibuprofen, or infection with bacteria, such as Helicobacter pylori can all produce gastritis.
Occasionally gastritis can come about after a major surgery, traumatic injury, burns, or severe infections. Specific diseases, like pernicious anemia and chronic bile reflux, or autoimmune disorders, can cause gastritis as well.
Though the most common symptom is abdominal upset or pain, other symptoms can include: