Redness in the white part of the eye is mainly seen in two cases: 1. It is caused by subconjunctival hemorrhage, which is the most common cause, usually due to bruising, eye rubbing, constipation, sneezing, coughing, or hematologic disorders that lead to abnormal coagulation and increased vascular fragility due to high blood pressure, triggering small blood vessels in the white part of the eye to rupture and bleed. Although the appearance looks serious, but does not cause substantial harm to the health of the eye, about half a month can be naturally absorbed. 2, due to conjunctival congestion, usually due to eye inflammatory stimulation caused by common conjunctivitis, iridocyclitis, keratitis, etc.. When inflammation occurs, the conjunctival blood vessels will be under the action of inflammatory factors, there is a dilation of the diameter, blood flow increases, and thus the eyes show red.