The human eye constantly produces tears to moisten our cornea, which are produced by glands located inside the eyelids. Where does this constant flow of tears go? In addition to some tears evaporating into the air when the eyes are opened, another part flows into the nasal cavity through a channel that is like a sewer for the eyes, which we call the tear duct. If the tear duct is blocked, the tears produced by the eyes cannot flow into the nasal cavity, but accumulate in the conjunctival sac and then flow out, so patients often have the performance of “teary eyes” and “more than tears”, and if the inflammation of the tear sac is secondary, there will be an increase in secretions and even If there is a secondary inflammation of the lacrimal sac, there will be an increase in secretions and even “pus” symptoms.