Exposure to allergy?: With your history if asthma, an exposure to an allergen is the likely scenario. Allergen exposure causes production of histamine in the upper airway causing blockage of sinuses and production of mucus. This leads to post nasal drip and cough.
Answered 6/3/2013
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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