Gastritis is an inflammation (irritation and swelling) of the lining of the stomach.
There are many causes of gastritis.
The most common are:
Less common causes are:
Gastritis can last a short time (acute gastritis) or for months to years (chronic gastritis).
Kuipers, E. Acid peptic disease. In: Goldman L, Ausiello D. Cecil Textbook of Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 141.