A subconjunctival hemorrhage is a burst blood vessel on the surface of your eye. It looks alarming, producing a vivid red patch on the white of the eye, but it’s almost always painless and harmless. The blood typically clears on its own within about two weeks without any treatment.
What Happens Inside the Eye
The white of your eye is covered by a thin, clear layer of tissue called the conjunctiva. This membrane contains tiny, fragile blood vessels. When one of those vessels breaks, blood leaks into the space between the conjunctiva and the white of the eye. Because the blood is trapped beneath a clear layer, it stays visible as a bright red spot or patch rather than draining away quickly.
The blood isn’t absorbed right away. Instead, it sits in that narrow space and your body gradually reabsorbs it over days to weeks, much like a bruise fading under your skin.
Common Causes and Triggers
Many subconjunctival hemorrhages happen spontaneously, with no obvious cause at all. You might wake up, look in the mirror, and notice a red blotch you can’t explain. Other times, a clear trigger is responsible.
Any sudden increase in pressure inside your head or chest can pop one of these delicate vessels. Doctors sometimes call this a Valsalva maneuver: the kind of forceful strain that happens when you cough hard, sneeze, vomit, or bear down while lifting something heavy. Even a bout of intense sneezing during allergy season can do it.
Other common triggers include:
- Eye trauma: rubbing your eyes vigorously, getting hit by a ball, or any direct pressure on the eye
- Contact lens wear: the routine pressure of putting lenses in and taking them out can irritate surface vessels, making hemorrhages more common in contact lens users
- Eye surgery: hemorrhages frequently appear after procedures on or around the eye
- Certain infections: some types of viral conjunctivitis (pink eye) can trigger bleeding beneath the conjunctiva
Risk Factors That Make It More Likely
While anyone can get a subconjunctival hemorrhage, certain health conditions and medications raise the odds. High blood pressure is considered the primary risk factor. The constant extra force on blood vessel walls makes them more prone to rupturing, including the tiny ones on the eye’s surface. Diabetes, high cholesterol, and hardening of the arteries (arteriosclerosis) also increase risk.
Blood-thinning medications play a significant role as well. If you take aspirin regularly, prescription anticoagulants, or over-the-counter anti-inflammatory painkillers, your blood doesn’t clot as quickly, which means even minor vessel damage can produce a more noticeable bleed. People on these medications often see larger or more frequent red patches.
What It Looks and Feels Like
The hallmark sign is a flat, bright red area on the white of your eye. It can be a small dot or cover a large section. Despite how dramatic it looks, most people feel nothing at all. You might notice a mild scratchy or full sensation on the surface of the eye, but there’s no pain and no change in your vision. If you’re experiencing actual eye pain, blurred vision, or sensitivity to light, something else is going on.
How It Differs From Serious Eye Bleeding
Not all eye bleeding is the same, and it helps to know the difference. A subconjunctival hemorrhage sits on the white part of the eye, outside the eyeball itself. A more serious condition called a hyphema involves bleeding inside the eye, specifically in the front chamber between the cornea and the colored part (iris). With a hyphema, the blood appears to pool over your iris or pupil rather than on the white of the eye.
The key distinctions: a hyphema causes pain and blurred or distorted vision, while a subconjunctival hemorrhage does not. A hyphema typically follows a direct blow to the eye and needs prompt medical attention. If the blood seems to be inside your eye rather than on the surface, or if you have pain or vision changes, that warrants an urgent evaluation.
Recovery Timeline
Most subconjunctival hemorrhages clear up on their own within two weeks. Larger patches may take a bit longer. As the blood is gradually reabsorbed, the bright red fades through darker shades and eventually takes on a yellowish or greenish tint, very similar to the color changes you’d see in a healing bruise on your arm. This color shift is normal and a sign that healing is progressing.
There’s no way to speed up the process. Artificial tears can help if you notice any mild scratchiness, and a cool compress in the first day or two may feel soothing, but neither will make the blood reabsorb faster. Avoid rubbing the eye, as that can irritate it further or even trigger additional bleeding.
When Recurrence Matters
A single episode is rarely a concern. But if subconjunctival hemorrhages keep happening, that pattern can signal an underlying issue. Recurrent episodes may point to uncontrolled high blood pressure, a bleeding disorder, or a problem with how your blood clots. It’s standard practice to check blood pressure after a subconjunctival hemorrhage and to investigate further if the problem recurs. If you notice red patches on your eye more than once or twice in a short period, especially without an obvious trigger like a hard sneeze, that’s worth bringing up with your doctor so they can check for systemic causes.