This book highlights five different sections of rhinosinusitis, namely allergic rhinitis, sinusitis, dental-related sinusitis, one airway disease, and surgical techniques in sino-nasal diseases. It incorporates new clinical and research developments as well as future perspectives in the ever-expanding upper and lower airway problems. I dedicate this book to those who provide continued research, high-quality clinical observations, and care, as well as selfless teaching and publications to advance knowledge in airway problems. ENT surgeons, rhinologists, allergologists, immunologists, pulmonologists, postgraduates, researches, trainees, and general practitioners with special interest in one airway disease will find this book useful and interesting.