The specific symptoms of lacrimal duct obstruction are as follows: 1, lacrimation and discharge, and this symptom continues to be unrelieved, and the effect of antibiotic treatment is not obvious; 2, pressure on the lacrimal sac area during examination will reveal a sticky discharge overflowing from the tear dots. Lacrimal duct obstruction is mainly due to the embryonic remnant membrane located at the end of the nasolacrimal duct not completely degenerated when the baby is born. Rarely, it is due to bony narrowing of the lacrimal duct or nasolacrimal duct, as well as developmental malformations of the nasal cavity. In adults or older adults, the obstruction of the lacrimal duct is usually due to adhesions of the nasolacrimal duct caused by chronic dacryocystitis. In rare cases, it may also be caused by trauma or nasal disorders.