Subconjunctival hemorrhage can be caused by rupture of the subconjunctival vessels or by an increase in their permeability. Because of the laxity of the subconjunctival tissue, hemorrhage tends to accumulate in sheets. Strictly speaking, subconjunctival hemorrhage is a symptom rather than a true disease, and a definite cause is rarely found. It is prevalent in one eye and can occur in any age group. Occasionally, there may be a history of intense coughing and vomiting. Other potentially relevant medical histories are: trauma (ocular trauma or head crush injury), conjunctival inflammation, hypertension, arteriosclerosis, nephritis, blood disorders (e.g., leukemia, hemophilia), certain infectious diseases (e.g., sepsis, typhoid), etc. Clinical manifestations】The initial stage is bright red, and then gradually turns brown. Usually absorbed by itself within 7 to 12 days. Large amount of bleeding can spread along the whole circumference of the eye. If recurrent, special emphasis should be placed on the examination of systemic diseases at this time. Treatment】 First of all, find the cause of bleeding and treat the original disease. Local cold compresses can be applied in the early stage of bleeding, and hot compresses can be applied twice a day after two days to promote the absorption of bleeding. Explain well to the patient to eliminate their concerns.