Bloodshot Eyes: Causes, Symptoms, and When to See a Doctor

Bloodshot eyes (conjunctival hemorrhage) occur when tiny blood vessels in the eye's white part burst. Common causes include:

• Injury (trauma, foreign object)
• Infection (conjunctivitis/pink eye)
• Allergies (hay fever)
• Dry eyes
• Smoking
• Blood clotting disorders
• Certain medications (blood thinners, NSAIDs, hormonal contraceptives)
• Contact lens wear

Most cases resolve within days. See an eye doctor if you have severe pain, vision changes, or bleeding that doesn't stop.