Table 1.

The definition of different kinds of cough triggers.

Variables	Definition	Cough triggers
Chemical triggers	A range of irritant environmental chemicals and mediators that could cause inflammation or tissue damage	Dust, cigarette smoke, cooking fumes
Mechanical triggers	Factors associated with change of tension of larynx or intrathoracic pressure	Talking, exercise, supine position
Thermal trigger	Factors relating to temperature	Cold air
Meal triggers	Factors relating to eating or drinking alcohol	Cough during meals, cough within 2 h after meals, cough after drinking alcohol