The exact mechanism of<unk>  depends on its etiology, but usually involves increased production of mucus from the<unk>  mucosa. In addition to providing sense of smell, the<unk>  cavity serves to filter and regulate the temperature and humidity of inspired air. The<unk>  mucosa can produce secretions, or mucus, that provides lubrication and protection for the<unk>  cavity. This mucus production is activated by the autonomic nervous system; specifically, cholinergic neuropeptides are responsible for increasing mucus production. Excess mucus can drain<unk> eriorly into the upper and lower airways, which, along with other physical and chemical irritants, can activate receptors in the respiratory tract that results in a protective physiological cough.
Post-nasal drip
Nasal congestion
Burning mouth syndrome
Epiglottitis
Croup
Rhinosinusitis
Hajj Cough
Nasal polyp