3 basic processes that can cause a cough

Answer 1

Tightening/Constriction of the airways caused by an irritant (smoke or allergens for example)

Decreased ability to clear secretions (poor cough effort)

Thickened secretions due to increased mucous production or thick sputum (will need fluids to thin the secretions, possible chest physiotherapy to loosen the secretions enough to expectorate)

Answer 2

Inflammation of airways, bronchospasm, mechanical stimuli such of mucus or foreign bodies.