What causes one eye to turn bloody?

A bloody eye, also known as subconjunctival hemorrhage, happens when a blood vessel in the white part of your eye (conjunctiva) bursts and blood spreads into the surrounding tissues.

In most cases, a subconjunctival hemorrhage is not a serious condition and will resolve on its own within 1-2 weeks. It can be caused by a variety of factors, including:

- coughing or sneezing forcefully

- constipation or straining during a bowel movement

- eye injury

- heavy lifting

- high blood pressure

- diabetes

- certain medications, such as aspirin or blood thinners

- contact lens wear

- dry eyes

- eye allergies

- certain medical conditions, such as thyroid disease or leukemia

If your eye is bloody and you are also experiencing pain, vision changes, or other symptoms, it is important to see an eye doctor right away as it may be a sign of a more serious condition.