This document provides information on various endoscopic procedures used in diagnosing and treating conditions of the nasal cavity, throat, esophagus, and lungs. It describes the indications, contraindications, procedures, and potential complications of nasal endoscopy, videolaryngoscopy, esophagoscopy, bronchoscopy, and nasopharyngoscopy/rigid pharyngolaryngoscopy. Key details covered include the diagnostic and therapeutic uses of each scope, as well as size recommendations for pediatric versus adult procedures.