A 3-YEAR-OLD boy was referred to the pediatric gastroenterology department for evaluation of abdominal pain and vomiting. The patient had a 1-year history of recurrent, acute, episodic abdominal pain that was often associated with vomiting. The episodes occurred infrequently and typically lasted for 48 to 72 hours. There was no nocturnal awakening with abdominal pain or emesis. There was no associated fever, diarrhea, rash, headache, or altered consciousness. The child has maintained growth at the 25th percentile both for height and weight.