Our expert says:
The blocing of the upper airway could be due to a number of factors, but the most likely place to start would be to exclude sino-nasal problems, especially allergies. Ask your ENT to check for possible allergens, including house dust mite and feathers. Inflammation could account for the blocked nose, and as the sinusses are then unable to drain, you will not experience a runny nose. Ask your doctor to do an ENT examination to try an establish a possible cause.
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