What should I know about controlled coughing?

COPD can cause your lungs to produce excess mucus, leading to frequent coughing. Not all coughs are effective in clearing excess mucus from the lungs. Explosive or uncontrolled coughing causes airways to collapse and spasm, trapping mucus.

The effective, or controlled, cough comes from deep within the lungs and has just enough force to loosen and carry mucus through the airways without causing them to narrow and collapse. Controlled coughing saves energy and therefore, oxygen.