Functional gastrointestinal disorders continue to be a prevalent set of conditions faced by the healthcare team and have a significant emotional and economic impact. In this review, the authors highlight some of the common functional disorders seen in pediatric patients (functional dyspepsia, irritable bowel syndrome, functional abdominal pain) as well as one of the more intriguing (cyclic vomiting). The most recent Pediatric Rome Working Group has modified the definitions of functional gastrointestinal disorders. Current studies have used these categorizations to understand better the epidemiology, etiology, and treatment options for these disorders. As more data are available, children and their families will be offered a better understanding of the conditions and more effective treatments to overcome them. The importance of making an accurate diagnosis of a functional gastrointestinal disorder cannot be overemphasized.