A subconjunctival hemorrhage is not dangerous. It looks alarming, often covering part or all of the white of your eye in bright red, but it causes no vision loss, no pain, and no lasting damage. Think of it as a bruise, except instead of forming under your skin, the blood pools under the thin, clear tissue that covers the white of your eye. Most cases clear up on their own within one to two weeks.
What’s Actually Happening in Your Eye
A tiny blood vessel in the conjunctiva, the transparent membrane covering the white of your eye, breaks open. Because the conjunctiva can’t absorb blood quickly, the blood gets trapped between this membrane and the eye’s surface, spreading out into a flat, bright red patch. It stays confined to that shallow space and never reaches the inside of your eye, which is why it doesn’t affect your vision, your pupil function, or anything else that matters for sight.
This is fundamentally different from bleeding deeper inside the eye, such as in the retina or behind the lens. Those types of hemorrhages can impair vision and cause inflammation. A subconjunctival hemorrhage does neither. It produces no scarring, no infection risk, and no permanent tissue damage of any kind.
Common Causes and Triggers
Most of the time, there’s no obvious cause. You might wake up and notice it in the mirror. But several everyday triggers can rupture these delicate vessels: sneezing hard, coughing, straining during a bowel movement, vomiting, rubbing your eyes, or lifting something heavy. Contact lens wear and minor eye irritation can also set one off.
Certain health conditions make subconjunctival hemorrhages more likely. High blood pressure, diabetes, and hardening of the arteries all stress small blood vessels throughout the body, including those in the eye. Blood-thinning medications, including aspirin, warfarin, and newer anticoagulants, reduce your blood’s ability to clot and can allow even minor vessel breaks to bleed more noticeably. Conditions that affect platelet counts or clotting function, such as anemia, leukemia, or kidney disease, are also linked to these hemorrhages.
When It Keeps Happening
A single episode is almost never a sign of anything serious. Recurrent subconjunctival hemorrhages, though, can sometimes point to an underlying issue worth investigating. If you’re getting them repeatedly, it may be worth having your blood pressure checked and, in some cases, having blood work done to look at your clotting function or platelet levels. People on blood-thinning medications who experience frequent episodes should mention it at their next appointment, since it could indicate the medication’s effect on clotting is stronger than intended.
How It Heals
Your body reabsorbs the trapped blood gradually, the same way it clears a bruise. The bright red patch typically fades through shades of orange and yellow before disappearing completely. The full process takes anywhere from 5 to 14 days depending on the size of the hemorrhage. Larger ones naturally take longer.
There’s no treatment that speeds this up. Some ophthalmologists suggest warm compresses may help slightly, but the evidence for that is limited. If your eye feels mildly scratchy or irritated, over-the-counter lubricating eye drops can provide comfort. Avoid rubbing the eye, which could irritate the area or potentially cause new bleeding.
Symptoms That Are Not Normal
A straightforward subconjunctival hemorrhage produces one symptom: redness. That’s it. You should not have pain, discharge, light sensitivity, or any change in your ability to see. If you notice any of those alongside the red patch, something else may be going on, and a professional eye exam is warranted.
Pay particular attention if the hemorrhage followed a direct blow or injury to the eye. Trauma can cause deeper damage that a surface-level blood spot might mask. In that scenario, an eye exam can rule out more serious injuries like bleeding inside the eye or damage to the eye’s structure. Similarly, if you experience sudden vision changes, double vision, or swelling around the eye, those symptoms don’t belong to a simple subconjunctival hemorrhage and need evaluation.
The Short Version
A subconjunctival hemorrhage is one of the most dramatic-looking things that can happen to your eye while also being one of the least harmful. It doesn’t touch your vision, doesn’t cause complications, and goes away on its own. The only time it deserves further attention is when it follows eye trauma, comes with other symptoms, or keeps recurring, since repeated episodes can occasionally signal a blood pressure or clotting issue worth checking.