Q:

What are the causes of red, bloodshot eyes?

A:

Quick Answer

Dryness, excessive sunlight, allergies, coughing, dust and infection are common causes for bloodshot eyes. These irritants induce swelling of the vessels in the white portion of the eyes.

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Full Answer

Eye infections or inflammation can cause itchiness, pain and vision problems. These include blepharitis, conjunctivitis, uveitis and corneal ulcers. Straining and coughing can sometimes result in a dense bloody spot in the eye called a subconjunctival hemorrhage. This is common and usually clears up within a couple of weeks. Another cause of bloodshot eyes is acute glaucoma, which is a sudden increase in pressure. Acute glaucoma is typically chronic and gradual and is a medical emergency.

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