Fuente: WIPO "olive oil" The present invention refers to a composition for use in the prevention and/or treatment of orogastrointestinal mucositis induced by oncologic treatments. It also refers to the use of said composition for preparing a medicament for the prevention and/or treatment of said orogastrointestinal mucositis. Furthermore, it refers to a method of preventing and/or treating of said orogastrointestinal mucositis in which said composition is administered to a subject in need thereof.