This book describes in depth the potential dangers of allergic asthma, like thunderstorm-asthma outbreaks, occupational asthma, allergic bronchopulmonary aspergillosis and new potential threats like climate change and air pollution influencing asthma. There are also other chapters describing the epidemiology, immunology and allergens related to allergic asthma. The concept of united airway disease is reviewed, and special situations like severe asthma and aspirin-exacerbated respiratory disease are also covered. Chapters about diagnostic approach and primary treatments, including biologics and clinical pharmacogenomics in asthma therapy, contributes to a more complete knowledge about this complex, fascinating and sometimes dangerous disease.