A bright red spot on the white of your eye is almost always a subconjunctival hemorrhage, which is a tiny broken blood vessel just beneath the clear surface layer of your eye. It looks alarming but is usually painless, doesn’t affect your vision, and heals on its own within one to two weeks. Think of it like a bruise, except the blood is trapped against the white of your eye where it’s impossible to miss.
What Causes the Blood Vessel to Break
The white of your eye is covered by a thin, transparent membrane called the conjunctiva, which contains dozens of fragile blood vessels. When one of these vessels ruptures, blood pools underneath and creates that vivid red patch. Sometimes the cause is obvious, but often people wake up and notice the spot with no idea how it got there.
The most common triggers are actions that briefly spike pressure in your head or face:
- Coughing or sneezing, especially forceful or prolonged bouts
- Straining, such as heavy lifting, pushing during a bowel movement, or intense exercise
- Vomiting
- Rubbing your eye too hard
- Minor bumps or pokes to the eye area
Wearing contact lenses can also contribute, particularly if they cause irritation or dryness that leads to rubbing. In many cases, the cause is never identified at all.
Health Conditions That Raise the Risk
An occasional red spot is rarely a sign of anything serious. But if you keep getting them, it may point to an underlying condition that weakens blood vessels or interferes with clotting. High blood pressure and diabetes are the two most common culprits. Both damage small blood vessels throughout the body, including the ones in your eyes. Blood clotting disorders, though less common, can also make these hemorrhages more frequent.
Medications matter too. Blood thinners, aspirin, and ibuprofen all reduce your blood’s ability to clot, which makes it easier for a small vessel to bleed and harder for it to stop. If you take any of these and notice recurring red spots, it’s worth mentioning to your doctor, though you should never stop a prescribed blood thinner without medical guidance.
What Healing Looks Like
Most subconjunctival hemorrhages resolve in about 5 to 10 days. The spot doesn’t disappear all at once. Instead, it follows a color progression similar to a skin bruise: the initial bright red fades to darker red, then shifts through shades of orange, yellow, or greenish-yellow before clearing completely. The spot may also spread out and look larger in the first day or two before it starts to fade. This is normal and doesn’t mean it’s getting worse.
You can speed things along slightly by applying warm compresses to the affected eye at least three times a day. If the surface of your eye feels mildly irritated or scratchy, over-the-counter lubricating eye drops can help with comfort. It also helps to cut back on vigorous exercise or strenuous physical work for a few days, since those activities can increase pressure and slow healing. Avoid aspirin and ibuprofen during recovery if they aren’t medically necessary, as they can thin your blood and prolong the hemorrhage.
Other Causes of Eye Redness
Not every red eye is a broken blood vessel. The pattern of redness helps you tell the difference. A subconjunctival hemorrhage creates a flat, solid patch of red with sharp borders, almost like someone painted a section of the white of your eye. It doesn’t itch, doesn’t produce discharge, and doesn’t make your eye feel different.
Episcleritis is a less common condition that causes a localized area of redness, sometimes with a slightly raised bump. It can feel mildly tender and may cause a dull ache, but it’s generally benign and self-limiting. Unlike a hemorrhage, the redness from episcleritis tends to look more like engorged, visible blood vessels fanning outward rather than a solid patch of trapped blood.
Pink eye (conjunctivitis) produces widespread redness across the entire white of the eye, usually with itching, burning, or discharge. Allergic and viral forms are common and resolve on their own, while bacterial conjunctivitis often produces thick, yellowish discharge.
When a Red Eye Needs Urgent Attention
A painless red spot with normal vision is almost never an emergency. But certain symptoms alongside redness mean you should seek immediate care:
- Sudden vision changes, including blurriness, double vision, or loss of vision
- Eye pain, especially if it’s severe or accompanied by a headache
- Sensitivity to light or seeing halos around lights
- Nausea or vomiting along with eye redness
- Swelling in or around the eye
- A chemical splash or foreign object in the eye
- Inability to open or keep the eye open
These combinations can signal conditions like acute glaucoma, uveitis (inflammation inside the eye), or a hyphema (bleeding inside the front chamber of the eye rather than on the surface), all of which require prompt treatment to protect your vision. If redness persists beyond two weeks, or if you notice thick mucus or pus lasting more than a few days, schedule an appointment with an eye care professional even without the urgent symptoms listed above.