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Bloodshot eyes are a term commonly used to describe red eyes. They are caused when the small blood vessels on the surface of the eye (sclera) become enlarged and congested with blood. This occurs as a result of insufficient oxygen supply to the cornea or the tissues covering the eyes.
Your eyes can become bloodshot because of allergies. Red eyes associated with burning and itching are often caused by allergies. The eyes become red because the blood vessels in the front part of the eye dilate and become larger. Fluid accumulates and causes swelling.