Lacrimal duct obstruction is a common and prevalent disease in ophthalmology, with the risk of latent intraocular and extraocular infections if not treated thoroughly. The principle of treatment is to control the inflammation of the lacrimal sac as a way to restore or establish a channel for drainage from the lacrimal duct to the nasal cavity. Lacrimal duct obstruction is a condition that can lead to a significant increase in the amount of tears flowing from the eye. The lacrimal duct is the channel through which tears drain from the eye and is a small duct that leads from the inside of the eyelid into the nasal cavity. When the tear duct is blocked, the tears cannot drain properly, which can lead to a number of symptoms. Lacrimal duct obstruction is more common in infants and is usually present from birth. Lacrimal duct obstruction can also occur in older children and adults, and is mostly caused by eye infections or injuries. The main symptoms of lacrimal duct obstruction are increased tearing, which can occur at times or persist, followed by increased crusting of the eyelids, redness of the whites of the eyes, and swollen, painful areas between the eyes and nose. In severe cases, the tears that accumulate in the tear duct can become infected due to the growth of microorganisms. Symptoms of tear duct infection can include redness, swelling, increased skin temperature, pain, and pus flowing from the eye. If the above symptoms occur, we must pay attention to them, and need to go to the hospital for relevant examination and symptomatic treatment.