Tearing can have many different causes, one of which includes a blockage anywhere along the tear drain system. The most common place for a blockage is at the nasolacrimal duct, which empties the tears into the nose. This is called a nasolacrimal duct obstruction and can cause mucous tears to back up into the eye, causing symptoms of yellow discharge and tearing. Treatment: A nasolacrimal duct obstruction can be treated by a surgical procedure called a dacryocystorhinostomy, which creates a new tear drain bypass into the nose.
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