What Causes a Blocked Tear Duct?
In babies, the most common cause of a blocked tear duct is the failure of the thin tissue at the end of the tear duct to open normally at or near birth. Other less common causes of blocked tear ducts in children include: Infections. Abnormal growth of the nasal bone that puts pressure on a tear duct and closes it off. Closed or undeveloped openings in the corners of the eyes (puncta) where tears drain into the tear ducts.
