Coughing could be the most socially awkward symptom. An increase in coughing can be caused by many factors. There might an increased amount of mucus in the body, there could also be more irritants or it could be comorbidity to another existing illness in the body influenza or emphysema. But coughing is actually very useful. It clears the mucus that clogs the airways, allowing easier breathing. There have also been studies showing that coughing can be a progress marker for disease in the cardiopulmonary area and has the potential to be useful in case-finding milder diseases in the community.