This book provides discussions on bronchial asthma from a clinical perspective, focusing on the recent studies on its pathophysiology, diagnosis and treatment. It also explores the lastest findings regarding the phenotypes and endotypes of asthmatic patients, making it of particular interest to those involved with non-eosinophilic asthma and eosinophilic asthma. Further, it discusses the importance of ILC 2 in eosinophilic asthma, and the accumulated results from the forced oscilliation technique and periostin that are actively practiced in Japan. As some aspects of diagnosis and treatment are different in Western and Asian countries, it is important that the data is disseminated around the globe.