People with blocked tear duct experience constant tearing and discharge from the affected eye. The exact cause of this disorder is not known, and various causes have been proposed. But importantly, most of these people (over 60%) suffer from other anatomic and inflammatory nasal problems of the nose such as nasal septum deviation, nasal polyp, sinusitis, or close proximity of the most anterior air cells of ethmoid sinus to tear duct, or other problems.