Coughing helps to break up secretions in the lungs so that the mucus can be expectorated or suctioned out if necessary.
It is also added to cough mixtures, when the cough is of the dry, painful kind, which serves no purpose, as nothing is expectorated.
This positive pressure permits airflow to reach beneath the areas of mucus obstruction and to move the mucus toward the larger airways where it can be expectorated.
Many children may wish to perform oral hygiene measures after therapy to lessen the poor taste of the secretions they have expectorated.
Coughing-In chest physical therapy, coughing is used to help break up secretions in the lungs so that the mucus can be suctioned out or expectorated.