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Red eye is a general term used to describe red, irritated and bloodshot eyes that can be caused by various conditions. These conditions include conjunctivitis (pink eye), which is an infection or swelling of the outer eyeball membrane, as well as allergies, scleritis, uveitis, external eyelid styes, closed-angle glaucoma, pterygium, hyphema, entropion, corneal ulcers, and dry eye syndrome glaucoma. The document provides a brief overview of the different possible causes of red eyes.