What are common causes of red eyes?

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 ... Nov 18, 2024 ... Red eyes in dogs can be caused by environmental irritants, upper respiratory infections, bacterial infections, and a variety of other eye conditions. May 23, 2024 ... Causes. Bloodshot eyes appear red because the vessels at the surface of the white portion of the eye (sclera) become swollen. Vessels may swell ... What are common causes of red eyes? · Allergies · Eye or eyelid inflammation · Pink eye (conjunctivitis) · Dry eyes · Glaucoma · Eye injuries · Smoking · Excessive ... Apr 10, 2017 ... Red eye is caused by light reflecting off the retina at the back of your eyes. Generally, it happens in low light conditions when a flash is ... Jul 12, 2018 ... This increases the blood flow to these areas and causes an overall decrease in blood pressure. The increased blood flow to your eyeball causes ... Oct 30, 2021 ... What is causing my dog's red eyes? · Allergies · Eye Injury or Trauma · Conjunctivitis · Dry Eye Syndrome. Dec 30, 2023 ... This cause of red, irritated eyes can range from quite mild to very serious. Your dog may have a hair or piece of grass stuck in their eye that ... What causes red eyes? · Dry eyes - a chronic condition caused by poor eye lubrication · Blepharitis - eyelid inflammation · Cellulitis - eye or eyelid infection ... May 2, 2022 ... Why Do I Have Bloodshot Eyes? · Dry eyes · Irritants such as smoke, pollen and perfume · Lack of sleep · Excessive alcohol consumption · Spending too ...