Pulmonary diseases Airway obstruction Upper Airway obstruction Lower Infectious pneumonia (bacterial, viral, fungal, and other) Tuberculosis Pertussis, parapertussis syndrome Cystic fibrosis Drug-induced pulmonary disease Vasculitis, collagen vascular disease Pulmonary dysgenesis Pulmonary edema Pneumothorax, hemothorax, chylothorax Drowning/near drowning Bronchopulmonary dysplasia Bronchiolitis Asthma Pulmonary hemorrhage Acute epiglottitis Laryngotracheobronchitis (croup) Bacterial tracheitis Foreign-body aspiration Adenotonsillar hypertrophy Retropharyngeal abscess Subglottic stenosis, web, or hemangioma Laryngomalacia Laryngeal edema Congenital neck anomalies (e.g., cystic hygroma, bronchial cleft abnormalities) Static encephalopathy Reactive airway disease (asthma) Bronchiolitis Foreign-body aspiration Cystic fibrosis Bronchiectasis Tracheobronchomalacia