A bright red patch on the white of your eye looks alarming, but in most cases it’s harmless and heals on its own within one to three weeks. The medical name is a subconjunctival hemorrhage, and it happens when a tiny blood vessel breaks in the thin, clear membrane (the conjunctiva) that covers the white of your eye. Blood leaks into the space between that membrane and the eyeball, where it gets trapped. It can’t be wiped away or rinsed out, so you have to wait for your body to reabsorb it.
Why It Happens
The conjunctiva is packed with tiny capillaries that break easily. Sometimes there’s an obvious trigger: a hard sneeze, a coughing fit, vomiting, heavy lifting, or straining on the toilet. All of these briefly spike pressure in the small vessels around your eye. Rubbing your eyes vigorously can do it too, as can a minor bump or contact lens irritation.
Other times there’s no clear cause at all, and you simply wake up and notice it in the mirror. That’s common and not a reason to worry on its own. Blood-thinning medications, including aspirin and prescription anticoagulants, make these bleeds more likely because they slow clotting. High blood pressure is another contributing factor, especially in people who have recurrent episodes.
What to Do Right Now
There’s no way to speed up the healing process significantly, but a few steps can keep your eye comfortable while the blood clears:
- Use lubricating eye drops. Over-the-counter artificial tears can relieve any mild scratchiness or irritation. Avoid drops that promise to “get the red out,” since they work by constricting blood vessels and won’t help with trapped blood.
- Skip rubbing. Rubbing the eye can worsen the bleed or cause a new one.
- Avoid blood thinners you don’t need. If you’re taking aspirin or ibuprofen for minor aches rather than a prescribed medical reason, consider switching to acetaminophen until the redness clears. Don’t stop a prescribed blood thinner without talking to your doctor first.
You don’t need to patch the eye, stay in a dark room, or limit screen time. Normal activities are fine.
What Healing Looks Like
The blood spot often looks worse before it looks better. In the first day or two, the red patch may spread as gravity pulls the trapped blood across the surface of the eye. This is normal and doesn’t mean the bleeding is continuing. Over the next one to three weeks, the color shifts from bright red to darker red, then to a yellowish or brownish tint, similar to the way a bruise fades on your skin. The body gradually reabsorbs the blood, and the white of your eye returns to normal without any scarring.
Larger bleeds that cover most of the white of the eye sit at the longer end of that timeline, sometimes taking closer to three or four weeks to fully clear.
When It Could Be Something More Serious
A simple subconjunctival hemorrhage doesn’t affect your vision and causes little to no pain. If you notice any of the following, the redness may point to a different, more urgent problem:
- Blurred or decreased vision
- Significant eye pain (not just mild grittiness)
- Sensitivity to light
- Bleeding that followed a direct injury to the eye, such as being hit by an object
- Blood that appears inside the colored part of the eye (the iris), not just on the white surface
- Repeated episodes happening every few weeks
Any of these warrant a prompt visit to an eye doctor or urgent care. Bleeding inside the eye itself, rather than on its surface, is a different condition entirely and needs evaluation quickly.
What a Doctor Will Check
For a straightforward case, diagnosis is visual. A doctor can confirm a subconjunctival hemorrhage just by looking at your eye, and no special tests are needed. If the bleeds keep recurring, the workup goes a little deeper. Expect questions about your overall health and medications, a blood pressure reading, a standard eye exam, and possibly blood tests to check for a clotting disorder. The goal is to rule out an underlying condition that’s making the vessels more fragile or more prone to bleeding.
Reducing the Chance of Recurrence
You can’t prevent every broken blood vessel, but a few habits lower the odds. Keep blood pressure well controlled, since chronic hypertension weakens capillary walls over time. If you wear contact lenses, handle them gently and keep them clean to minimize irritation. Try not to rub your eyes, especially during allergy season when itching makes it tempting. When you feel a sneeze or cough coming, don’t try to stifle it, as suppressing a sneeze actually increases pressure in the head and eye area more than letting it happen naturally.
If you’re on blood thinners and getting frequent subconjunctival hemorrhages, mention it at your next appointment. The bleeds themselves aren’t dangerous, but they can be a useful signal that your medication’s blood-thinning effect is worth reviewing.