A cough is a sudden, often repetitive, spasmodic contraction of the thoracic cavity, resulting in violent release of air from the lungs, and usually accompanied by a distinctive sound. A cough is usually initiated to clear a buildup of phlegm in the trachea; air may move through this passage at up to 480 km/h (300 mi/h). ...

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A cough is a sudden, often repetitive, spasmodic contraction of the thoraci ...
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Cough is Ubiquitous—and Mysterious
... "My dear doctor, I’m surprised to hear you say that I am coughing very badly, because I have been practising all night." John Philpot Curran, Irish statesman, trial lawyer and orator; 1750–1...
Source: Cleveland Clinic