The causes of eye tearing and their treatments are as follows: 1. Tearing due to excessive tear production is treated by removing the cause, including inflammation causing, for example, excessive tear production due to inflammation of the conjunctiva and cornea, which is treated by giving antibiotics, eye drops or eye drops that nourish the cornea. If the tearing is caused by an impingement, the impingement is removed, and if there is an entropion, it is treated surgically. If there are stones, remove the stones. 2. Tears caused by excessive outflow, excessive outflow is lacrimal obstruction, lacrimal stenosis, which should be treated by surgery, laser, or tube placement according to the location of the lacrimal obstruction. Tear duct disease is a common disease of the eye, multi-morbidity, if there is dacryocystitis, there are bacteria lurking in the tear sac, tear duct area, is a risk factor to cause infection after intraocular and extraocular surgery, so the appearance of tear duct blockage should be operated and treated as early as possible.