The body's nasal and sinus membranes have similar responses to viruses, allergic insults, and common bacterial infections.
Membranes become swollen and congested.
These secretions may thicken over time, may slow in their drainage, and may predispose to future bacterial infection of the sinuses. Congestion of the nasal membranes may even block the eustachian tube leading to the ear, resulting in a feeling of blockage in the ear or fluid behind the eardrum. Additionally, nasal airway congestion causes the individual to breathe through the mouth. Each year, more than 37 million Americans suffer from sinusitis, which typically includes nasal congestion, thick yellow-green nasal discharge, facial pain and pressure. Many do not understand the nature of their illness or what produces their symptoms.