Functional dyspepsia is a medical term that refers to a condition resulting in stomach upset or pain in the upper abdomen. Functional dyspepsia is defined by one or more of the following:
-fullness after eating
-feeling full fast
-pain in the epigastrium (upper central region of the stomach)
-burning in the epigastrium
-lack of structural explanation for these symptoms (for example, symptoms can not be explained by an obstruction, narrowing, anatomical defect, or other such cause).
For a diagnosis of functional dyspepsia, these symptoms should be present for the past three months, with the initial onset at least 6 months prior to diagnosis.