APA Dictionary of Psychology

n. abdominal pain or discomfort that may be caused by ulcers; gastroesophageal reflux (i.e., acid reflux, acid indigestion, or heartburn); gallstones; and, rarely, stomach or pancreatic cancer, although in a majority of cases the cause is unknown. Functional dyspepsia (formerly called nonulcer dyspepsia) describes the condition when other medical illnesses have been excluded; it may be experienced, for example, after eating too much or too quickly or eating during stressful situations. See also gastroduodenal ulceration.