Rumination syndrome (RS) is a condition characterized by repeated, effortless regurgitation of material (usually food). RS is classified as both a disorder of gut-brain interaction, and as a feeding and eating disorder. Not only can the experience of RS be distressing, it can severely impact a patient's medical functioning and ability to live a full life. RS is unfortunately an overlooked (and thus under-treated) condition, as individuals with RS may often describe their symptoms as “reflux” or “vomiting.” RS can also co-occur with other gastrointestinal and eating disorders, further complicating the clinical picture. The good news is that RS can be successfully treated. This book offers a comprehensive treatment approach for RS, for use with children, adolescents, and adults. With evidence backing its use, Cognitive-Behavioral Therapy for RS (CBT-RS), is designed for clinicians (behavioral health or medical) to use with patients in their own clinical settings. With case examples and a practical stepwise approach, clinicians are able to take CBT-RS into their own clinical settings to increase treatment access for RS.