This document discusses gastrointestinal disorders and provides information on disorders of the mouth and esophagus. It begins by reviewing the learning objectives, which are to review anatomy and physiology of the gastrointestinal system, discuss causes and management of various gastrointestinal disorders, and apply nursing process to care of clients with these disorders. Specific disorders covered include stomatitis, oral cancer, salivary gland disorders including sialadenitis, cysts, and benign and malignant tumors. Signs, symptoms, causes, investigations, and treatments are described for each disorder.