“Generally speaking, the most common causes of nasal congestion are various functional and organic diseases, such as various colds, deviated nasal septum, enlarged turbinates, allergic rhinitis, acute and chronic sinusitis, foreign bodies in the nasal cavity and various benign and malignant tumours in the nasal cavity.
In addition, long-term abuse of decongestants such as “nasal drip” or “ephedrine” may also lead to nasal congestion. Although these drugs can relieve the discomfort of the nose for a while, the effect is symptomatic but not curative. After the medication has been administered, secondary vasodilatation may occur, causing the symptoms of nasal congestion to reappear or even worsen, and this may even lead to drug rhinitis over time.
Sometimes, nasal congestion may also be related to poor living conditions. For example, the nose is often irritated by cold air (cold air conditioning, cold weather), irritating odours, tobacco smoke, volatile organic compounds, etc., all of which can trigger nasal congestion and affect the flow of breath.”