Prolonged runny nose: When a runny nose lasts longer than about 2 weeks, the possibilities include allergies, sinus infection and irritant rhinitis (chemical, fumes, etc). Most colds do not last that long. Coughing associated with runny nose could be post nasal drip (again from allergies or sinus infection) or from the lungs (such as asthma). An allergist or ENT physician would be good resources if symptoms persist.
Answered 6/19/2017
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