The inside of the nasal passage swells up, causing a blockage.
The Sun
It worked its way into a sinus before finally moving into a nasal passage.
The Sun
In this case, try using a nasal dilator to keep the nasal passage open.
Times, Sunday Times
It can also cause your nasal passage to swell.
The Sun
Cold, dry air affects the linings of the nasal passage and upper respiratory tract, making them drier and more vulnerable to viral infection.
Times, Sunday Times