Eye swelling is a common complaint in ophthalmology clinics and can be caused by a variety of diseases. One of the causes of eye swelling is visual fatigue, which can be caused by long-term overuse of the eyes, refractive error (myopia, hyperopia, astigmatism) that has not been corrected, inappropriate glasses, etc. In addition, eye regulation is reduced, such as the appearance of presbyopia, but use of the eyes without glasses can lead to visual fatigue, causing eye swelling. Second may be dry eye, dry eye is the general term for any cause of tear quality or quantity abnormalities or kinetic abnormalities, resulting in a decrease in tear film stability, and accompanied by eye discomfort and/or ocular surface tissue lesions characteristic of a variety of diseases. Three may be glaucoma. Open-angle glaucoma and chronic closed-angle glaucoma are likely to present only with eye distention, while acute closed-angle glaucoma attacks can cause eye pain and even headache in addition to eye distention; in addition, certain diseases can cause secondary glaucoma, such as iridocyclitis, keratitis, and uveitis, which, in addition to eye distention, have symptoms of their own diseases. Fourth, it may be conjunctivitis, which can have eye swelling and conjunctival congestion. In conclusion, there are numerous causes of eye swelling, some of which can cause serious damage to vision and need to be taken seriously and treated in a timely manner at a hospital.