eyes look red or bloodshot when the tiny blood vessels on the surface of the eye (the conjunctiva) expand and become swollen with blood. most often this is due to simple irritation of the eye from allergies dust or dryness. red or bloodshot eyes are also symptoms of many different conditions that affect the eye. for example having a deep red area on the white of the eye may be due to a subconjunctival hemorrhage a usually harmless condition. other eye conditions causing bloodshot eyes include: conjunctivitis (inflammation caused by infection or allergies) blepharitis (inflammation of the eyelash follicles on edges of the eyelids) uveitis (inflammation of the uvea the colored portion and middle layer of the eyeball) corneal ulcers (sores on the cornea created by infection or injury) acute glaucoma (a sudden increase in pressure inside the eye) trauma or eye injury it can be hard to tell if bloodshot eyes are due to a serious condition or not. generally speaking if bloodshot eyes are accompanied by pain an injury a change in vision nausea and vomiting or light sensitivity see a doctor. caus you be blazin teh herb. what causes bloodshot eyes when i workout i get bloodshot eye's when i cry when i'm angry i also take warfrin but i been getting this before i started taking warfrin i have high blood pressure too which i'm taking meds for
what causes bloodshot eyes?