1. Sensation of discomfort, distress, or agony in the abdominal region; generally associated with functional disorders, tissue injuries, or diseases.
2. Pain in the abdominal cavity.

Abdominal pain can be acute or chronic. It may reflect a major problem with one of the organs in the abdomen: such as, appendicitis or a perforated intestine, or it may result from a fairly minor problem; such as, excess buildup of intestinal gas.