Respiratory allergy is constantly encountered and is sharply on the rise, particularly in the two most vulnerable age-groups: young children and seniors. Allergy results in airway hyperactivity and increased airway resistance, with all inflammatory sequelae being ensued. The chapters show how respiratory allergy research is interconnected with other disciplines by discussing neurotransmitter, membrane receptor, and ionic channel mechanisms of allergy and by giving diagnostic and pharmacological cues on desensitization and therapy.