Doug h Origin Common causesNature/characteristics Pharynx Post-nasal drip Usually persistent Larynx Laryngitis, tumor Harsh, barking Trachea Tracheitis Painful Bronchi Bronchitis Dry or productive Asthma Dry or productive, Worse at night Pneumonia Dry initially, productive later Bronchiectasis Productive. Changes in posture induce sputum productionOrigin Common causes Nature/characteristics Pharynx Post-nasal drip Usually persistent Larynx Laryngitis,tumor Harsh,barking Trachea Tracheitis Painful Bronchi Bronchitis Dry or productive Asthma Dry or productive, Worse at night Pneumonia Dry initially, productive later Bronchiectasis Productive.Changes in posture induce sputum production Cough