If there is no other discomfort in the corner of the eye, and if the redness is clearly defined by the surrounding white of the eye, it is likely that there is a subconjunctival hemorrhage. Subconjunctival hemorrhage is caused by the rupture of blood vessels under the bulbar conjunctiva, or by an increase in osmotic pressure, because the tissue under the bulbar conjunctiva is relatively loose and bleeding tends to accumulate in sheets. Strictly speaking, subconjunctival hemorrhage is a symptom, not a true disease, and many can be caused, but the exact cause can rarely be found. It is generally common in one eye and can occur at any age. Occasionally the patient may have a cough or vomiting, such as in young people after drinking alcohol, which is related to this vomiting, and others in the elderly, which may have some relationship with blood pressure. In addition, trauma, inflammation of the conjunctiva, arteriosclerosis, blood disorders or certain infectious diseases may be related, and it will absorb on its own in 7-12 days. In case of recurrent attacks, it may be necessary to emphasize the importance of checking whether there are systemic diseases in the whole body, for example, it may be necessary to check whether there are problems with blood clotting or whether the platelets are low.