Asthma: A Comprehensive Reference Book provides a thorough, evidence-based, and clinically relevant overview of asthma, one of the most prevalent chronic respiratory diseases worldwide. Affecting both children and adults across all regions, asthma remains a major public health challenge because of its heterogeneous nature, variable clinical presentation, and substantial impact on quality of life, healthcare systems, and long-term respiratory outcomes. This volume has been developed to offer readers a clear and structured understanding of the disease, integrating fundamental scientific concepts with practical clinical application. The book begins by introducing the global epidemiology of asthma, tracing its historical development and highlighting how modern understanding has evolved from a symptom-based description to a sophisticated view of chronic airway inflammation, immune dysregulation, and biologically distinct disease endotypes. It explores the core mechanisms underlying asthma pathophysiology, including airway inflammation, bronchial hyperresponsiveness, airway remodeling, and the roles of inflammatory cells, mediators, and cytokine pathways that drive disease progression. Subsequent chapters examine the genetic, environmental, occupational, and behavioral factors that contribute to asthma susceptibility and exacerbation. Particular attention is given to allergen exposure, respiratory infections, air pollution, smoking, exercise, and psychosocial stress, all of which influence disease expression and control. The text further discusses the wide spectrum of clinical manifestations and outlines contemporary diagnostic approaches, including symptom assessment, spirometry, bronchodilator reversibility testing, biomarker evaluation, and differential diagnosis. A major focus of the book is the modern classification of asthma according to symptom control, severity, phenotypes, and endotypes. Readers are guided through current evidence-based management strategies, ranging from inhaled corticosteroids and bronchodilators to biologic therapies targeting specific inflammatory pathways.
