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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.
This means that rhinitis symptoms continue long-term. One definition that doctors use for persistent rhinitis is rhinitis symptoms that last for an hour or more on most days of the year. However, in practice there is great variation.