The membrane that lines the nasopharynx is similar to that of the lung so we refer to the airway (that extends from the tip of the nose to the depths of the lung) as the ‘united airway’.
When people suffer from inflammatory conditions of the nose and lungs, like allergic rhinitis (often referred to as hay fever) and asthma, this membrane becomes swollen and produces mucous.
Treatment is aimed at reducing inflammation in the airways. Often the lungs and the nose need treatment simultaneously as the entire airway is affected. It is important for patients with asthma to be assessed for allergic rhinitis because up to 80 percent of patients with asthma also need treatment for allergic rhinitis, and it is difficult to control asthma in patients who suffer from untreated allergic rhinitis.