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Jan 16, 2020 ... Allergies are the primary cause of red eyes. The body reacts to an allergen—pollen, pet dander, mold, dust—by releasing histamines. Histamines ... Sep 12, 2022 ... Dry Eye Disease. Dryness is the most common cause of red eyes. Healthy eyes contain liquid, which keeps them moist and functional. Occasionally, ... A “red eye” is a general term to describe red, irritated and bloodshot eyes. The redness happens when tiny blood vessels under your eye's surface get larger or ... Nov 8, 2023 ... Bloodshot eyes can result from various factors, ranging from temporary irritations to more serious medical conditions. Apr 2, 2025 ... Pink Eye in Dogs (Conjunctivitis): Pink eye, or conjunctivitis, is a common cause of red eyes in dogs. It's characterized by inflammation of the ... A RED OR BLOODSHOT EYE – SUBCONJUNCTIVAL HAEMORRHAGE · There are some potentially serious causes of this, but the most common (and benign) cause is a ... Nov 21, 2016 ... bloodshot eyes can be caused by a bunch of different things. They're often a sign of another problem—like dry eyes, too little sleep, or even ... Dec 29, 2022 ... One of the common causes of sudden bloodshot eyes is a subconjunctival hemorrhage. It sounds serious, but it is usually harmless and resolves in ... Mar 7, 2025 ... A red eye usually goes away in a week or two if it's caused by something minor, like conjunctivitis or a small burst blood vessel. These issues ... Feb 26, 2025 ... Yes, sinus allergies can cause red eyes. This happens when allergens trigger the body's immune response, leading to inflammation and swelling in ...