Dacryocystitis is a common disease of the lacrimal sac, in which patients may experience overflow of tears, swelling and pressure pain in the lacrimal sac area, and other uncomfortable symptoms. It may be due to abnormal nasal structure or injury, etc., which leads to narrowing or blockage of nasolacrimal duct, prompting long-term retention of tears in the lacrimal sac and triggering bacterial growth. Dacryocystitis occurs when the body’s immunity is weak. Dacryocystitis is categorized into acute dacryocystitis and chronic dacryocystitis. When there is inflammation in the lacrimal sac, patients may experience redness, swelling and pain in the lacrimal sac area. Because the inflammation leads to narrowing or blockage of the tear ducts, tears accumulate in the eyes, and patients experience discomfort such as tear overflow, swelling of the lacrimal sac area, and purulent discharge. In addition, chronic dacryocystitis can also cause patients with localized skin flushing, eczema, etc., while patients with acute dacryocystitis can also develop abscesses in the lacrimal sac area, with pus flowing from the lacrimal sac area upon pressure. It is recommended that patients with dacryocystitis seek medical attention to evaluate their condition and follow the doctor’s instructions for treatment.