causes blocked tear duct
Some of the causes of a blocked tear duct include: 1  Congenital conditions â some babies are born with a blockage within the tear duct system, usually the nasolacrimal duct. The thin membrane that seals the nasolacrimal duct in utero fails to open at birth.
The following can also cause a blocked tear duct: 1  Infections caused by bacteria or a virus. 2  Injuries to your face, such as a broken nose. 3  Certain medicines, such as eyedrops used to treat glaucoma.  Sinus surgery or other 1  procedures. An object in your tear duct.  A mass in your eye.