Cough

A cough is a sudden, often repetitive, spasmodic contraction of the thoracic
cavity, resulting in violent release of air from the lungs. A cough is
usually initiated to clear a buildup of phlegm in the trachea; air may move
through this passage at up to 300 mph. Coughing can also be triggered by a
bolus of food going down the trachea instead of the esophagus, due to a
failure of the epiglottis, although this may result in choking instead.
Frequent or chronic coughing usually indicates the presence of a disease.

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