Swelling of the epithelium of the eyes may be due to physiological factors such as drinking too much water and overuse of the eyes, or it may be due to pathological factors such as conjunctivitis and granuloma. 1. Physiological factors: usually patients usually drink too much water or overuse of the eyes, the phenomenon of epithelial swelling of the eyes, is a normal physiological phenomenon, reduce the amount of water, pay attention to rest can relieve or eliminate the symptoms. 2. Pathological factors: conjunctivitis, granuloma, etc. may also appear epithelial swelling of the eyes. (1) Conjunctivitis: this disease is related to microbial infection, physical irritation, tear duct blockage, eye tumors and other factors, and do not pay attention to personal hygiene, body immunity decline, the presence of tuberculosis and other underlying diseases, etc., can also be induced by conjunctivitis, the eyes appear red, swollen, itchy, tearing, secretion, etc., which will be swollen epithelium of the eyes. (2) Staphylococcus aureus: usually due to staphylococcus aureus infection, and unclean hands, poor eyelid hygiene, decreased immunity, etc. due to staphylococcus aureus infection, local redness, swelling, heat, pain and other symptoms, but also can be manifested as boils, pustules, etc., but also accompanied by a yellowish exudate, and some patients can also be manifested as swollen eyelids. Patients with symptoms of epithelial swelling of the eyes, and a long time without relief, need to actively seek medical treatment.