ABSTRACT. Objective. To determine whether medically unexplained recurrent abdominal pain (RAP) in childhood predicts abdominal pain, irritable bowel syndrome (IBS), other somatic complaints, and psychiatric symptoms and disorders in young adulthood.Methods. A sample of 28 young adults evaluated for RAP between the ages of 6 and 17 years were compared with 28 individually matched former childhood participants in a study of tonsillectomy and adenoidectomy. RAP caseness was established by structured retrospective chart review requiring agreement by 2 independent reviewers. Standardized assessments of abdominal pain, IBS, other somatic symptoms, psychopathology, perceived health, and history of maltreatment were performed an average of 11.1 years after the index visit.Results. Former RAP patients were significantly more likely than controls to endorse anxiety symptoms and disorders, hypochondriacal beliefs, greater perceived susceptibility to physical impairment, poorer social functioning, current treatment with psychoactive medication, and generalized anxiety in first degree relatives. There were trends suggesting associations between childhood RAP and lifetime psychiatric disorder, depression, migraine, and family history of depression, but group differences on abdominal pain, IBS, other somatic symptoms, and history of maltreatment were not statistically significant.Conclusions. There is a strong and relatively specific association between childhood RAP and anxiety in young adulthood. Affected children may be at special risk to perceive physical symptoms as threatening, and should be evaluated for psychiatric disorder on initial presentation. Pediatrics 2001;108(1). URL: http://www. pediatrics.org/cgi/content/full/108/1/e1; abdominal pain, pain, anxiety, depression, colonic diseases, functional.ABBREVIATIONS. RAP, recurrent abdominal pain; FGD, functional gastrointestinal disorder; IBS, irritable bowel syndrome; DSM, Diagnostic and Statistical Manual of Mental Disorders; SCID-NP, Structured Clinical Interview for DSM-IV, Non-patient Version; BSI, brief symptom inventory; NS, not significant. R ecurrent abdominal pain (RAP) has been most consistently defined in the pediatric literature as at least 3 episodes of abdominal pain occurring during a period of at least 3 months that are severe enough to affect the activities of the child. 1,2 RAP is common, affecting between 7% to 25% of school-aged children and adolescents, 1,3-11 and may be responsible for 2% to 4% of pediatric office visits. 12 RAP becomes more prevalent with increasing age into adolescence 1,5,7,10 and is more common in girls, 4,13 with an equal gender ratio in early childhood, 11,14 but greater female symptom reporting in late childhood and adolescence. 1,9,10 Specific structural, infectious, inflammatory, or laboratory abnormalities are unusual in RAP, particularly in the absence of "red flags" such as weight loss, gastrointestinal bleeding, pain awakening the child at night, systemic symptoms such as fever, or laboratory evidence of anemia or inf...