Environmental factors Genetic predisposition Bronchial Inflammation Upper respiratory tract Bronchial infection Allergens Hyperreactivity+trigger factors Exercise Emotionalupset edema Bronchoconstriction Mucus production Airways Narrowing SymptomsEnvironmental factors Genetic predisposition Bronchial Inflammation Bronchial Hyperreactivity+trigger factors Oedema Bronchoconstriction Mucus Production Airways Narrowing Symptoms Upper respiratory tract infection Allergens Exercise Emotional upset