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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.
Although bloodshot eyes can be caused by relatively mild conditions, such as dry eyes or the common cold, bloodshot eyes can also be caused by serious or life-threatening conditions, such as an anaphylactic reaction or acute glaucoma, both of which should be immediately evaluated in an emergency setting.llergic causes of bloodshot eyes. Bloodshot eyes can be caused by mild to serious allergic reactions including: Anaphylactic allergic reaction to any substance. Drug allergy, such as penicillin or codeine. Hay fever or allergic reaction from animal dander, dust, cosmetics, or pollen. Insect bite allergy such as bee sting.