Coughing is the action by which excess mucus is driven out. It is a vital body defense mechanism, which ejects every thing from germs to foreign bodies from the lungs and windpipe. When a person is unable to cough, as for instance, following surgery or a chest injury, pneumonia may develop and cause a serious threat.
The air passages of the lungs are lined with cells secreting mucus. They normally trap particles of dust. When the membranes the lining of air passages is irritated. Coughing helps eliminate this excess mucus. In the process a dry hacking sound is produced. It is a very common condition affecting persons of all ages.
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