Eyes unknowingly tears are mostly seen in the following reasons. First, the tear duct is blocked, under normal circumstances, the lacrimal gland secretes tears, most of which are diverted to the nasal cavity through the lacrimal system to be absorbed by the nasal mucosa, and some of them are evenly coated on the surface of the eyeballs to lubricate the surface of the eyeballs and moisturize the eyeballs. When the tear duct system is blocked, the tears can not be properly drained to the nasal cavity, most of the overflow of the surface of the eye appear unknowingly tears, the need to do tear duct surgery. Second, inverted eyelashes, inverted eyelashes will repeatedly irritate the surface of the eye, tearing, foreign body sensation and other discomforts, mild inverted eyelashes need to be extracted or electric eyelash capsule can be, serious extensive inverted eyelashes need to do inverted eyelashes corrective surgery in order to completely treat.