A sudden red blood clot in the white of the eye without pain is clinically seen as subconjunctival hemorrhage, which is a symptom caused by the rupture of capillaries under the conjunctiva, so there is a punctate or flaky bruise. There are various triggering factors, such as excessive force during coughing, sneezing, eye rubbing, trauma to the eye or head, long-term use of antiplatelet drugs such as aspirin, clopidogrel or anticoagulant drugs, or diseases such as hypertension, arteriosclerosis, leukemia, nephritis, etc., which may trigger the rupture or increased permeability of the subconjunctival blood vessels of the eye and thus lead to the symptoms of subconjunctival hemorrhage. After the appearance of subconjunctival hemorrhage, some patients can absorb and subside on their own in 1-2 weeks. Simple treatment can be performed at home, such as local cold compresses around the eyes with towels wrapped in ice, frozen spoons and other items within 48 hours of the appearance of the clot, and hot compresses with hot towels, hot water bags and other items after 48 hours to promote the subside of the clot. During this period, care should be taken to avoid direct contact of ice with the skin, or too high a temperature when applying hot compresses, so as not to cause frostbite or burns. If the symptoms do not subside, or are accompanied by eye irritation such as burning sensation, stinging, tearing, etc., artificial tear drops such as sodium vitreous oxide drops and polyvinyl alcohol drops can be used locally under the guidance of a doctor after consultation. In addition, patients should try to avoid precipitating factors of subconjunctival hemorrhage in daily life, such as forceful eye rubbing, local trauma, etc. If there is a primary disease, treatment should be actively carried out. A reasonable diet, regular work and rest, and a relaxed mood should also be maintained in daily life to help the recovery of the disease.