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What Is a Subconjunctival Hemorrhage? Subconjunctival hemorrhage is red lines or spots on the part of the eye that is usually white. The redness is usually harmless and painless. You may not know your eyes are red until someone tells you or you look in a mirror. How Does the Hemorrhage Occur? The conjunctiva is the thin sheet of transparent tissue that covers the sclera (the white part of your eye). It contains many blood vessels that are usually too small to see.
Although it is not always possible to identify the source of the problem, some potential causes of subconjunctival hemorrhage include: Eye trauma can cause a broken blood vessel; A sudden increase in blood pressure that can result from heavy lifting, coughing, sneezing, laughing and constipation; Aspirin or blood thinners such as warfarin (one brand name is Coumadin)