Criteria - all of the following:
(1) A duration of symptoms >= 12 cumulative weeks over the past 12 months (may or may not be consecutive).
(2) Frequent episodes of vomiting (>= 1 episode per day for >= 3 days per week)
(3) Exclusion of underlying physical disease following a complete examination.
(4) Exclusion of self-induced and/or medication-induced vomiting.
(5) Exclusion of an eating disorder, rumination or major psychiatric disorder.
Exclusions for physical disease:
(1) gastrointestinal disorder, including obstruction, delayed gastric emptying, GERD or other conditions
(2) neurologic disorder, including autonomic dysfunction
(3) metabolic disorder, including electrolyte and endocrine disorders
Differential diagnosis:
(1) functional dyspepsia (consider if vomiting occasional)
