Dacryocystitis is a common disease in ophthalmology, mostly seen in adult women and middle-aged and elderly people, and is divided into two types: chronic dacryocystitis and acute dacryocystitis, with the former being the most common. The main symptoms of chronic dacryocystitis are lacrimation, pus flow, increased eye discharge, and overflow of purulent secretions visible by squeezing the inner canthus. When chronic lacrimal sacitis develops into acute inflammation, in addition to the above symptoms, the skin of the inner canthus will also appear red, swollen, hot and painful, sometimes accompanied by swelling of the same side, swollen lymph nodes in front of the ear and under the jaw and painful pressure, after which, if not effectively treated, with the control of inflammation, the abscess gradually confined can break from the skin surface to form a fistula, which does not heal over time. The cause of dacryocystitis is the acute and chronic inflammation of the lacrimal sac caused by the obstruction of the nasolacrimal duct and the retention of tears and bacteria in the lacrimal sac, which stimulates the lining of the lacrimal sac. Dacryocystitis not only causes great inconvenience and pain in life and work, but also acts as a potential source of infection in the eye and can easily lead to intraocular septic infection when eye trauma or internal eye surgery is performed. The main treatment methods for lacrimal sac infection are: 1, medication Chronic lacrimal sac infection is mainly treated with local application of antibiotic eye solution, 3 to 4 times/day, squeeze and empty the secretions in the lacrimal sac before dropping the medication, so that the medication is inhaled into the lacrimal sac; acute lacrimal sac infection, in addition to local application of antibiotic eye solution, systemic antibiotics should be used to control the infection. In general, through treatment, purulent secretions can disappear, but can not lift the blockage of the tear duct, after stopping the drug symptoms of dacryocystitis will reappear and recur. 2.Lacrimal laser The principle of laser treatment for lacrimal obstruction is to penetrate the obstructed area by vaporizing the tissue. The advantage is that it requires less energy, less damage, less painful for the patient and easy to accept. The disadvantage is that the traumatic surface of the lacrimal duct obstruction caused by the laser treatment may be reoccurring, and the lacrimal duct wall may be scarred, and the success rate of treatment should be increased by repeated lacrimal ointment injection. This treatment method is not suitable for acute dacryocystitis, for patients with chronic dacryocystitis, because of the presence of purulent secretions in the tear sac, its treatment success rate is lower than that of patients with simple nasolacrimal duct obstruction. 3, lacrimal duct placement Patients with obstruction at the nasolacrimal duct can consider lacrimal duct placement surgery. The lacrimal duct laser is used to penetrate the site of lacrimal duct obstruction, and a lacrimal duct prosthesis is placed to support and dilate the lacrimal duct, which can prevent the adhesion of the lacrimal duct obstruction, help the repair of the lacrimal duct mucosa epithelium, and facilitate the re-formation of the lacrimal duct. The disadvantage is that the prosthetic tube supports the patient’s nasolacrimal duct, and the treatment effect is influenced by the congenital physiological structure of the patient’s nasolacrimal duct, and the effect is not ideal for patients with narrow nasolacrimal duct and bony obstruction, and there is a possibility of reobstruction after removal of the tube. 4.Lacrimal sac removal surgery After the removal of the lacrimal sac, there is no longer pus discharge into the conjunctival sac, but because the way of tear drainage to the nasolacrimal duct is blocked, it cannot solve the problem of postoperative lacrimation. 5, tear sac nasal anastomosis (1) tear sac nasal anastomosis through skin incision: It is a traditional surgical way to treat chronic lacrimal sac. The procedure requires a 1-1.5 cm skin incision in the inner canthus to surgically anastomose the local nasal mucosa and the lacrimal sac together to create a channel for drainage of tears. The advantage is that the patient’s nasolacrimal duct structure is not affected, and the channel for drainage of tears is re-established with a high success rate; the disadvantage is that there is a surgical incision on the patient’s face, and the recovery time from surgery is longer, leaving a scar after surgery. (2) Transnasal endoscopic lacrimal sac nasal anastomosis: It is an advanced and effective surgical method for minimally invasive treatment of dacryocystitis. The method is to make the surgical incision directly in the nasal cavity under direct vision through the illumination and magnification of the endoscope without going through a skin incision, to anastomose the mucosa of the nasal cavity and the mucosa of the lacrimal sac, and to re-establish the channel for drainage of tears. In addition to all the advantages of transdermal lacrimal sac nasal anastomosis, it also has the advantages of less tissue damage, immediate disappearance of tear and pus symptoms after surgery, no surgical incision on the face, and fast recovery of patients after surgery, etc. It has better efficacy for chronic dacryocystitis, acute dacryocystitis and recurrent dacryocystitis. There are many different treatments for dacryocystitis, but which treatment option should be chosen for different patients? The important thing is that a standardized examination of the lacrimal tract and the development of a personalized treatment plan by the doctor is a strong guarantee that the patient will obtain the desired surgical result after surgery.