Tearing is a common clinical symptom in infants and young children, and there are several common causes: 1. conjunctivitis: it is an inflammation of the conjunctiva on the surface of the eye, manifested by redness, tearing and increased secretions, which is usually treated promptly and has no effect on vision, and can be treated with antimicrobial eye medication; 2. inversion of the eyelid: inversion of the eyelid makes the eyelashes fall back towards the eye, and frictional stimulation leads to tearing and eye redness and pain. If corneal damage is found, surgical treatment should be considered. Beijing Tongren Hospital oculoplastic specialty Zhao Ying 3, congenital dacryocystitis: is a congenital abnormal development of the tear duct, manifested as lacrimation, pressure on the inner canthus (inner corner of the eye) with secretions overflow, should be checked and treated at the hospital. 4, congenital glaucoma: this condition is relatively rare, manifested as eyes afraid of light and tearing, the cornea (black eye) and eye enlargement, should be promptly to the hospital for examination and treatment.