There are more reasons for patients’ eye swelling, which may be caused by physiological reasons, and may also be related to pathological reasons, such as acute dacryocystitis, insect bites and other reasons. 1. Physiological causes: if the patient sleeps with a low pillow, poor sleep at night, it can cause physiological edema, which is usually not accompanied by other uncomfortable symptoms and can be relieved after rest. 2.Pathologic causes (1) Acute dacryocystitis: Acute dacryocystitis occurs suddenly on the basis of the patient’s tear duct obstruction, and under the stimulation of inflammation, the patient may have symptoms such as eye swelling, pain, and increase in eye secretion. (2) Insect bites: If the patient’s eye skin is bitten by mosquitoes, because their mouthparts contain certain toxins, it will also cause the patient’s eye swelling, pain and other uncomfortable symptoms. It is recommended that patients with obvious eye swelling consult a doctor in time to assess their condition and continue treatment as prescribed by the doctor.