Tendency to weep is generally due to the following two causes: 1. Excessive tear secretion, which can be divided into primary and secondary. Primary excessive tear secretion is caused by the lacrimal gland itself, which is rare, and most of them are secondary excessive tear secretion. There are many reasons for this, such as local eye irritation, factors such as impingement, foreign bodies, physical and chemical stimulation, and emotional excitement, emotional impact, and drugs or eye lesions, which cause stimulation factors to form excessive tear flow. 2, tear secretion is normal, but the outflow is affected, commonly due to tear duct obstruction or narrowing, the main symptom is easy tear flow. For children, it is usually the nasolacrimal duct or the lower end is not fully developed at birth, and the residual mucosal folds appear. In middle-aged and elderly people, lacrimal duct obstruction is more common. Sometimes some elderly people wipe their tears for a long time, which also causes lower lid relaxation and ectropion, which can also aggravate the symptoms of lacrimation, which is also one of the causes. In some older adults, if tearing occurs but the lacrimal duct is clear when flushed, it may be due to functional tearing due to age, relaxation of the orbicularis oculi, and weakening or loss of tear extrusion.