Nasal congestion may be caused by many different factors. It is important to understand the cause of nasal congestion in order to be able, preferably with your physician or pharmacist, treatment modes which respect the nasal mucosa and its physiological functions.
Nasal congestion is caused by inflammation triggered by viruses, bacteria or airborne irritants or allergens, all of which attack the nasal mucosa.
When attacked, the nasal mucosa defends itself immediately. It calls up special immune cells from its blood supply and produces substances which create conditions unfavorable to the attackers (the mediators of inflammation) and a greater quantity of mucus.
In order to carry on this intense “quick response” activity, the mucosa requires increased blood supply from the network of capillaries which underlies the epithelium. This causes the capillaries to widen (vasodilatation).