The symptoms of upper respiratory infections are infections of the nose, throat, paranasal sinuses or larynx, such as the common cold, sore throat (pharyngitis), tonsilitis, sinusitis, and laryngitis.
Coughing is a protective reflex causing instant forming of dense air along the bronchis, trachea and larynx.
Inflammation of the mucosa (catarrh) is symptomized by mucosal edema which makes it difficult or impossible for air to flow.
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