Blood in the eye, also known as subconjunctival hemorrhage, can be a concerning and alarming sight. It occurs when blood vessels in the conjunctiva, the clear membrane covering the white part of the eye, rupture and bleed. While it may look serious, it is usually harmless and resolves on its own. However, it is important to understand the potential causes of blood in the eye to ensure proper care and treatment.

1. Eye trauma: One of the most common causes of blood in the eye is trauma or injury. This can occur due to a direct blow to the eye, rubbing the eye vigorously, or even from wearing contact lenses improperly.

2. High blood pressure: Uncontrolled high blood pressure can put strain on blood vessels throughout the body, including those in the eye. When blood pressure is too high, it can cause the delicate blood vessels in the conjunctiva to burst, resulting in blood in the eye.

3. Eye infections: Certain eye infections, such as conjunctivitis or pink eye, can cause blood in the eye. Infections can lead to inflammation and irritation of the blood vessels, making them more prone to rupture.

4. Eye surgery: Some individuals may experience blood in the eye after undergoing eye surgery, such as cataract surgery or LASIK.

5. Blood-thinning medications: Certain medications, such as aspirin or anticoagulants, can increase the risk of bleeding and bruising. If blood vessels in the eye are already fragile, these medications can contribute to the development of blood in the eye.

While blood in the eye can be a cause for concern, it is usually not a serious condition and tends to resolve on its own. However, it is important to identify the underlying cause to ensure appropriate treatment if necessary. If blood in the eye is accompanied by pain, vision changes, or other concerning symptoms, it is advisable to seek medical attention. Otherwise, most cases of blood in the eye will clear up within a week or two without any intervention.