Table 2 Definitions of functional dyspepsia according to the Asian, North American, Korean, and European clinical guidelines

Definition of FD

In the past three months, with one of the following symptoms:

Postprandial fullness;

Early satiety;

Epigastric pain;

Epigastric burning;

Bloating in the upper abdomen;

Nausea;

Vomiting;

OR

Belching

In the past month, the patient must present with predominant epigastric pain. Predominant epigastric pain may be associated with any other upper gastrointestinal symptoms, such as epigastric fullness, nausea, vomiting, or heartburn

In the past month, the patient must present with one of the following symptoms:

Pain or discomfort in the upper abdomen;

Postprandial fullness;

Early satiety;

Bloating;

Nausea;

OR

Vomiting

The patient must present with one of the following symptoms (no recall period specified):

Postprandial fullness;

Early satiety;

Epigastric pain;

OR

Epigastric burning

AND

No evidence of organic upper gastrointestinal disease that is likely to explain the symptoms