GHRL and digestive system disorder: The top three most cited documents were “Functional gastroduodenal disorders,” “Childhood Functional Gastrointestinal Disorders: Child/Adolescent,” and “The Serotonin Signaling System: From Basic Understanding to Drug Development for Functional GI Disorders.” Frequency counts and network co-occurrences of keywords reveal trends in this field, including “gastric emptying,” “anxiety,” “acupuncture,” and “ghrelin.”