Rhinitis is an inflammatory condition of the nasal mucosa characterized by nasal obstruction, hyperirritability, and hypersecretion. There are several types including allergic, non-allergic, infectious, and miscellaneous. Non-allergic rhinitis includes conditions like vasomotor rhinitis, rhinitis medicamentosa, occupational rhinitis, and rhinitis during pregnancy. Treatment depends on the type but may include avoidance of irritants, saline irrigation, topical steroids, decongestants, surgery, or a combination.