"Rhin-" refers to your nose, and "itis" means inflammation. So rhinitis is inflammation and swelling inside your nose.
Rhinitis can be caused by:
An allergic reaction to something, such as dust, mold, pollen, grass, trees, and animals (allergic rhinitis)
An infection, such as the common cold
Breathing very dry or dirty air
Older people sometimes have thinning and hardening of the lining of their nose tissue, which causes rhinitis.
Treatment depends on what's causing your rhinitis.
If an allergy is causing your rhinitis, doctors will have you avoid what you're allergic to. They'll treat you with:
Doctors may treat other types of rhinitis with: