High Quality Content by WIKIPEDIA articles! Rumination syndrome, or Merycism is an under-diagnosed chronic condition. This reference sets out the criteria and characterizations of rumination syndrome in adolescents (As it was previously defined only in infants and the mentally/physically handicapped), in particular the signs and symptoms, causes, demographics, diagnostic criteria, and patient outcomes. characterized by effortless regurgitation of most meals following consumption. There is no retching, nausea, heartburn, odours, or abdominal pains associated with the regurgitation, as there is with typical vomiting. The disorder has been historically documented as affecting only infants, young children, and people with cognitive disabilities (where the prevalence is as high as 10% in institutionalized patients with various mental disabilities). Today it is being diagnosed in increasing numbers of otherwise healthy adolescents and adults, though there is a lack of awareness of the condition by doctors, patients and the general public.