Blocked tear duct - Symptoms & causes - Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/blocked-tear-duct/symptoms-causes/syc-20351369
WEBMar 8, 2023 · If your eyes are continually irritated, red and inflamed, you're at higher risk of developing a blocked tear duct. Previous surgery. Previous eye, eyelid, nasal or sinus surgery may have caused some scarring of the duct system, possibly resulting in a blocked tear duct later. Glaucoma. Anti-glaucoma medicines are often used topically on the eye.
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