How does bloodshot in the eye happen?

Bloodshot eyes, also known as conjunctival haemorrhage, occur when tiny blood vessels in the white of the eye (conjunctiva) burst and leak blood. This can be caused by a variety of factors, including:

1. Injury: Trauma to the eye, such as being hit in the face or getting something in the eye, can cause blood vessels to burst.

2. Infection: Conjunctivitis (pink eye) is an inflammation of the conjunctiva that can be caused by bacteria or viruses. It often causes bloodshot eyes along with other symptoms such as itching, burning, and discharge.

3. Allergies: Allergic reactions, such as hay fever, can cause inflammation of the conjunctiva and bloodshot eyes.

4. Dry eyes: A lack of tears can irritate the conjunctiva and cause blood vessels to burst.

5. Smoking: Smoking can damage the blood vessels in the eyes and make them more likely to burst.

6. Blood clotting disorders: Some blood clotting disorders can cause increased bleeding and the formation of blood clots in the eyes.

7. Certain medications: Some medications, such as blood thinners, NSAIDs, and hormonal contraceptives, can increase the risk of bloodshot eyes.

8. Contact lens wear: Wearing contact lenses can irritate the eyes and cause blood vessels to burst.

In most cases, bloodshot eyes are not a serious problem and will clear up on their own within a few days. However, if you experience severe pain, changes in vision, or bleeding that does not stop, it is important to see an eye doctor.