MSH: A sudden, audible expulsion of air from the lungs through a partially closed glottis, preceded by inhalation. It is a protective response that serves to clear the trachea, bronchi, and/or lungs of irritants and secretions, or to prevent aspiration of foreign materials into the lungs.,MEDLINEPLUS: <p>Coughing is a reflex that keeps your throat and airways clear. Although it can be annoying, coughing helps your body heal or protect itself. Coughs can be either acute or chronic. Acute coughs begin suddenly and usually last no more than 2 to 3 weeks. Acute coughs are the kind you most often get with a <a href=''>cold</a> or <a href=''>flu</a>. Chronic coughs last longer than 2 to 3 weeks. Causes of chronic cough include</p><ul><li> <a href=''>Asthma</a></li><li> <a href=''>Allergies</a></li><li> <a href='http://www.nlm.nih.go

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