A broken blood vessel in the eye almost always heals on its own without treatment. The bright red patch you’re seeing is called a subconjunctival hemorrhage, and while it looks alarming, it’s painless and harmless in the vast majority of cases. The blood sits trapped beneath the clear membrane covering the white of your eye, and your body reabsorbs it within a few days to a few weeks.
Why It Happens
The clear membrane over the white of your eye (the conjunctiva) contains dozens of tiny, fragile blood vessels. When one of them pops, blood pools in the space between the membrane and the eye’s surface. Because there’s nowhere for the blood to go, it spreads out into a vivid red or dark red patch that can cover a small spot or most of the white of your eye.
Common physical triggers include coughing, sneezing, straining (like during a heavy lift or bowel movement), vomiting, and rubbing your eye too hard. A minor bump or poke to the eye can do it too. Sometimes there’s no identifiable cause at all. The condition is surprisingly common, with a nationwide study in Taiwan finding roughly 60 to 65 cases per 10,000 people annually. It peaks in people aged 60 to 69 and is slightly more common in women than men.
Blood-thinning medications, including warfarin, can increase your risk of eye bleeding. People with uncontrolled high blood pressure or blood clotting disorders may also experience them more frequently.
What You Can Do at Home
There’s no way to speed up the healing. The blood has to be reabsorbed naturally, and that process takes anywhere from a few days for a small spot to two or three weeks for a larger one. During that time, the red patch often shifts in color, turning yellowish or greenish as the blood breaks down, similar to how a bruise fades on your skin.
If the eye feels scratchy or mildly irritated, over-the-counter artificial tears can help. Avoid rubbing the eye, which could irritate the area or even cause additional bleeding. If you take aspirin or blood thinners, don’t stop them on your own, but mention the broken vessel to your prescribing doctor at your next visit, especially if it keeps happening.
How to Tell It’s Not Something Serious
A standard broken blood vessel has a few key features: it doesn’t hurt, it doesn’t affect your vision, and the blood sits on the white part of the eye. If all three of those are true, you’re almost certainly dealing with a harmless subconjunctival hemorrhage.
A more serious condition called hyphema involves bleeding inside the eye itself, in front of the colored part (the iris). With hyphema, the blood appears to be where your eye color is rather than on the white. It causes pain, and you may notice layered blood pooling, with darker blood settling at the bottom and brighter blood on top. Hyphema is a medical emergency. If you see blood in front of your iris, have eye pain, notice vision changes, or experience nausea and vomiting alongside the redness, seek emergency care immediately.
When It Keeps Coming Back
A single episode rarely means anything is wrong beyond bad luck or a strong sneeze. Repeated broken blood vessels, though, can signal an underlying issue worth investigating. High blood pressure is one of the most common culprits, and recurrent episodes may be the nudge that leads to a diagnosis. Blood clotting disorders and certain medications can also play a role.
Contact an eye care specialist if you experience eye pain with a broken vessel, if you notice vision changes, or if the hemorrhages keep recurring over weeks or months. In those situations, your doctor may check your blood pressure, review your medications, or order blood work to rule out a clotting problem.
Reducing Your Risk
You can’t prevent every broken blood vessel, but a few habits help. Avoid rubbing your eyes forcefully. Wear protective eyewear during sports or activities where something could hit your face. If you have seasonal allergies that make you rub your eyes, treating the underlying itch with antihistamine drops removes the temptation. Managing high blood pressure through diet, exercise, or medication also lowers your overall risk. And if chronic constipation has you straining regularly, addressing that with more fiber or a stool softener removes another common trigger.