Gastritis is a general term for any disorder that affects digestion, causes stomach pain, and is the result of the effect of stomach acid or other caustic substances on the stomach lining and esophagus. Gastritis can be acute or chronic, and can vary widely in degree of pain and length of attack. There are several underlying conditions that can cause gastritis, in roughly increasing order of severity they are: Several medications, notably aspirin, can also cause gastritis. What is the Gastritis (in Spanish)