Subconjunctival hemorrhage should be referred to as subconjunctival hemorrhage, which is caused by the rupture of small blood vessels in the conjunctiva. Subconjunctival hemorrhage manifests as red patches in the white eye, when the bleeding is small, there are only small spots of redness, when the bleeding is more, the whole white eye is covered by the bleeding, presenting a red eye state, but the patient does not have obvious conscious symptoms such as blurred vision, pain and discomfort, very few people have slight swelling and pain when bleeding, so most patients find subconjunctival hemorrhage when they are reminded by others or when they look in the mirror. There are many causes of subconjunctival hemorrhage, some are related to diabetes, hypertension, local small vessel lesions, taking anticoagulant drugs such as warfarin and aspirin, while more people do not have any disease and are associated with incidental factors such as head-down exertion, violent coughing, vomiting, alcohol consumption, and constipation. Because the location of the bleeding is subconjunctival, it will not cause any substantial damage to the eye and will not affect vision, so no special treatment is needed and it is sufficient to wait for the bleeding to absorb on its own, with the absorption time ranging from one week to one month depending on the amount of bleeding. For a few patients who have aesthetic requirements and want to speed up the absorption of subconjunctival hemorrhage, local hot compresses can be applied three days after the hemorrhage. In conclusion, subconjunctival hemorrhage is caused by the rupture of small blood vessels in the conjunctiva and has no adverse effect on the eye, so no special treatment is needed.