The common causes of frequent tearing are as follows: First, ocular surface diseases, such as conjunctivitis, keratitis and other ocular surface diseases often appear tearing, but also redness of the eye, increased secretion, foreign body sensation, burning sensation and other symptoms, antibiotic eye drops can be given to treat the eye. Second, the tear duct disease, the tear duct including tear duct, tear duct, tear duct, tear sac, nasolacrimal duct, each part of the obstruction can cause tearing, which is the main reason for tearing, such diseases need surgical treatment, such as expansion of tear duct, tear duct probing, tear duct placement, tear duct nasal anastomosis surgery. Third, the position of the eyelid is abnormal, such as lid entropion, inverted eyelashes, eyelid ectropion, etc. can lead to abnormal position of the lacrimal punctum, or inverted eyelashes eyelashes touching the corneal surface to stimulate the cornea caused by such diseases also need surgical correction and treatment. Fourth, the corneal epithelium is damaged, such as corneal foreign body, wearing contact lenses or splashing acid and alkali chemicals in the eye, causing damage to the corneal epithelium, which leads to a foreign body sensation, pain, watering of the eyes, you can be for different reasons for different emergency treatment. In short, frequent tearing of the eyes should not be ignored, and should go to the regular ophthalmology for comprehensive diagnosis and treatment.