Sudden edema of the white part of the eye usually refers to conjunctival edema, which is common in conjunctivitis, overuse of the eyes can also occur such adverse symptoms, it is recommended to consult a doctor in time for examination. 1. Conjunctivitis: ① allergic conjunctivitis: the white part of the eye is the conjunctiva suddenly edema, usually accompanied by itching, burning sensation and other adverse symptoms, will make the mucous secretion increase. ② bacterial conjunctivitis: will make the conjunctiva appear edema, redness and other adverse symptoms, there will be obvious foreign body sensation, the patient’s eyes will be sore, itchy and other discomforts. 2. Excessive eye use: prolonged overuse of the eyes may also lead to sudden edema of the white part of the eye, daily life regularly stay up all night will appear this kind of situation, may be accompanied by pseudomyopia vision loss, there will be obvious visual fatigue, eye soreness and other symptoms. This kind of situation, it is recommended to go to the hospital in time for relevant examination, identify the cause of the disease and actively cooperate with the doctor for treatment, to avoid aggravation of the condition.