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Nasal obstruction is the state when there is a blockage in the nasal passage because of swollen membrane. These nasal membranes get swollen up due to the sore blood vessels. You can also term nasal obstruction as nasal congestion, stuffy nose, plugged nose, nasal blockage as well as blocked nose. Some of the common causes of nasal obstruction are sinusitis, common cold, allergies, nasal spray overuse, deviated septum, dry air, enlarged adenoids etc.