What causes frequent tears?

The eyes often shed tears for many reasons. For example, lacrimal duct obstruction or stenosis, eyelid inversion, trichiasis, conjunctivitis, keratitis, eye local long-term medication, long-term wearing contact lenses, etc. can be caused. Lacrimal punctum eversion, lacrimal punctum stenosis, lacrimal punctum occlusion or defect, lacrimal duct to nasolacrimal duct obstruction or stenosis, can also cause eyes love tears. Congenital atresia of lacrimal punctum, inflammation, stones, trauma, foreign bodies and other factors, caused by lacrimal duct structure or function is not complete, resulting in tears can not be discharged. Other such as nasal obstruction, etc., can also cause eye tears. Therefore, it is recommended that hospital examination, for different causes, symptomatic treatment.