Croup is a term used to describe a variety of respiratory inflammatory conditions that affect the upper respiratory tract, cause swelling, increased mucus production and is usually more common in children.he main symptoms of croup are a barking cough which has been described to sound similar to a barking seal or sea lion, which may begin suddenly during the night. The barking cough of croup is due to swelling and inflammation around the vocal chords and windpipe (i.e., the larynx and trachea).
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