Can't stop coughing?
A cough is caused by the body responding to an irritation of the windpipe or removing other substances inside the lung. The cough is physically created by a spasm of the diaphragm resulting in a quick expulsion of air. This air leaving the lungs takes with it the irritant leaving the throat and lungs clean. So really a cough is the body's way of “scratching its throat and clearing the lungs”.