An Introduction to Principles and Practice of Respiratory Medicine is intended to be the first book read by postgraduates in Respiratory and Internal Medicine. It represents a broad spectrum of issues relevant to the clinician involved in managing respiratory diseases. There is material for the basic researcher as well as extensive material for the clinicians. This textbook will appeal to both graduate and postgraduate students in Respiratory Medicine, academicians and the clinicians managing patients in their day-to-day practice. A broad spectrum of issues in Respiratory Medicine is covered. The chapter on chest imaging is extensive with more than 100 illustrations in a single chapter and outlines new directions for the clinicians to approach interpretations of images. Airway diseases section is equally extensive with few chapters using the case-based problem-solving approach for easier understanding. A comprehensive overview of the respiratory system is presented thus making it easy to read and understand.