A frequently underdiagnosed disorder

Rumination syndrome, derived from the Latin verb “ruminare”, is a disorder that appears both in the classification of “functional gastrointestinal disorders” (ROME IV) and in the “eating disorders” of the Diagnostic and Statistical Manual of Mental Disorders,5^th Edition. Clinically, it manifests as repeated regurgitation of undigested food, which is then chewed again and either swallowed again or spat out. The disorder is often described in children, but some studies also report incidents in adolescents and adults.