This fully revised and expanded second edition provides a comprehensive and up-to-date overview of nasal physiology and pathophysiology. With the help of numerous tables, schematic drawings, and color photographs, it helps readers gain a better understanding of the impact of structural changes and the process of disease development, and to make treatment decisions. Each chapter has been written by a leading expert in the field and addresses one important aspect in an accessible way. Covering all four functions of the nose: respiration, defense, olfaction and cosmesis, the book discusses the various techniques for the clinical evaluation of nasal function as well as current trends and future directions in nasal physiologic research. This second edition also includes additional chapters on rhinomanometry, local nasal inflammation, T cells and B cells, and artificial intelligence for the nose. Given its scope, the book is a valuable resource for both experienced otorhinolaryngologists and novices in the field.