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1 Post-nasal drip can cause sore throat, cough, or throat clearing.  Treatment for rhinitis includes avoiding allergens, medications (both over-the-counter and prescription), and irrigating the nasal passages. Surgery is a last resort to correct any structural issues in the sinuses that may be causing the symptoms.
Drugs. A number of drugs can cause rhinitis or worsen it in people with conditions such as deviated septum, allergies, or vasomotor rhinitis: 1  Overuse of decongestant sprays used to treat nasal congestion can, over time (3 - 5 days), cause inflammation in the nasal passages and worsen rhinitis.