Nasal spray oil are also available. There is however no trial-verified evidence that they have a measurable effect on symptoms. Decongestant nasal sprays are available over-the-counter in many countries. They work to very quickly open up nasal passages by constricting blood vessels in the lining of the nose. Prolonged use of these types of sprays can damage the delicate mucous membranes in the nose. This causes increased inflammation, an effect known as rhinitis medicamentosa or the rebound effect. Decongestant nasal sprays are advised for short-term use only, preferably 5 to 7 days at maximum. Some doctors advise to use them 3 days
Post-nasal drip back of the throat from the nasal cavity is a normal physiologic process that occurs in all healthy individuals. Post-nasal drip has been challenged as a syndrome and instead is widely viewed as a symptom by various researchers as a result of the wide variation amongst differing societies. Furthermore this rebuttal is reinforced due to the lack of an accepted definition, pathologic tissue changes, and available biochemical tests. PND may present itself through the constant presence of discomfort within an individual's upper airways as a result of the transportation of mucus from nasal membranes down the back of the throat