In my 35 years as a practicing pediatrician, I saw many children for abdominal pain. This chapter provides a brief overview of my approach to evaluating abdominal pain in children ages 5 to 11 years old (pre-pubertal). This outline is not meant to be comprehensive or exhaustive, and it assumes its readers are clinical providers with training in the medical evaluation of children. We hope that its inclusion will help to provide a structure for excluding medical causes prior to starting the FBI treatment program. However, we include this caveat: your own clinical judgement must be your guide; no outline can substitute for your own evaluation of an individual patient.