What causes red bloodshot eyes?

There are several causes of redness in the eyes: 1. Staying up late or having poor sleep quality can lead to eye fatigue and cause red blood vessels to appear. 2. Prolonged use of electronic devices or reading without sufficient eye rest may also result in redness. 3. Inflammatory conditions such as conjunctivitis or keratitis can cause blood vessel dilation, leading to redness, often accompanied by increased eye discharge. 4. Exposure to allergens such as pollen or dust may trigger allergic conjunctivitis, causing eye congestion. 5. Dry eyes can damage the corneal and conjunctival tissues, resulting in redness, along with symptoms like dryness and itching. 6. Foreign bodies such as eyelashes or dust entering the eye can irritate the cornea and conjunctiva, potentially causing redness. 7. Eye trauma from impact or pressure may injure ocular tissues and lead to redness. If eye redness persists, it is advisable to seek medical attention promptly for professional diagnosis and treatment.