This document provides an overview of the respiratory system including anatomy, physiology, assessment, common problems and diseases. It begins with the outline of topics to be covered, including the relevant anatomy and physiology of both the upper and lower respiratory tract. Assessment techniques such as history taking, physical exam, laboratory tests like ABG analysis and sputum analysis are described. Common respiratory conditions of the upper airway like rhinitis, sinusitis and pharyngitis are outlined along with associated findings and nursing interventions.