Blood Spot on the Eye (Subconjunctival Hemorrhage)
What Is a Subconjunctival Hemorrhage?
The conjunctiva is a thin, transparent membrane that covers the white part of your eye and lines the inside of your eyelids. This delicate tissue contains many tiny blood vessels that supply oxygen and nutrients to the surface of your eye.
Because the conjunctiva is so clear, any blood that collects beneath it becomes very visible against the white background of your eye.
A subconjunctival hemorrhage happens when one or more small blood vessels in the conjunctiva break and leak blood. The blood becomes trapped between the conjunctiva and the white part of your eye, creating a visible red patch.
- The blood vessels in the conjunctiva are extremely fragile
- Even minor events can cause them to rupture
- The bleeding is confined to the space beneath the clear membrane
- Most breaks occur without any injury or known trigger
The blood appears especially bright and startling because it sits right beneath a clear membrane. Unlike a bruise on your skin, where blood pools beneath layers of tissue, the blood in a subconjunctival hemorrhage is only covered by a transparent layer.
This clear covering acts like a window, making the red blood cells highly visible and creating the dramatic appearance that often worries patients.
Subconjunctival hemorrhages are very common and can happen to anyone at any age. These blood spots affect people of all backgrounds and occur frequently.
Many patients discover them by chance when looking in a mirror, or someone else may notice the red spot and point it out.
Symptoms and When to Worry
The most obvious symptom is a bright red or dark red area on the white part of your eye. This patch may be small, or it can cover a large section of the white surface.
- The redness appears suddenly, often overnight
- The patch has clear borders where red meets white
- The colored part of your eye (iris) is not affected
- Your pupil maintains its normal appearance and response to light
Most people with a subconjunctival hemorrhage have no pain at all. The blood spot itself is typically painless when it occurs on its own without other eye problems.
However, pain, light sensitivity, or significant tenderness can suggest a different diagnosis such as a corneal abrasion, eye infection, inflammation inside the eye, or elevated eye pressure. These symptoms require prompt evaluation by our eye doctor.
Some patients notice a mild scratchy sensation or slight fullness in the affected eye. This feeling is similar to having a grain of sand or an eyelash on your eye, but much milder.
Any irritation typically goes away within a day or two, even though the red spot takes longer to disappear.
While most blood spots are harmless, certain symptoms require urgent evaluation. We recommend seeking immediate care if you experience any of these red flags.
- Sudden vision loss or blurry vision that does not clear
- Severe eye pain or headache
- Blood spots in both eyes at the same time
- A hemorrhage after an eye injury or head trauma, especially with decreased vision, an irregular pupil, increasing swelling, or blood appearing to circle the entire white of the eye
- Chemical exposure to the eye
- Pain, light sensitivity, or discharge in a contact lens wearer
- Frequent recurring blood spots without an obvious cause
What Causes Blood Spots to Form on the Eye
Any activity that causes a rapid increase in pressure can break the delicate blood vessels in your eye. A forceful sneeze, vigorous coughing fit, or straining during a bowel movement can all trigger a hemorrhage.
- Heavy lifting or intense exercise
- Vomiting or retching
- Childbirth and labor
- Bending over with your head down for extended periods
Medications that reduce blood clotting can make the tiny vessels in your eye more likely to bleed. Prescription anticoagulants and antiplatelet drugs are the main concern and have the clearest association with subconjunctival hemorrhages.
Natural supplements like fish oil, ginkgo biloba, and high-dose vitamin E have variable effects on bleeding risk. We recommend discussing any supplements with your prescribing clinician before making changes, rather than stopping or starting them on your own.
Rubbing your eyes vigorously, especially when they feel itchy or irritated, can cause blood vessels to break. Small objects or particles that scratch the eye surface may also trigger bleeding.
Contact lens wearers who insert or remove their lenses roughly may occasionally develop a blood spot from the minor trauma.
Chronic high blood pressure puts extra strain on all blood vessels in your body, including the fragile ones in your eyes. If your hemorrhage occurs alongside uncontrolled hypertension, we may recommend closer monitoring of your blood pressure.
Bleeding disorders that affect how well your blood clots can also make subconjunctival hemorrhages more likely to occur or recur.
Eye procedures such as cataract surgery, injections into the eye, or laser treatments can sometimes result in a subconjunctival hemorrhage as a minor side effect. These procedure-related blood spots typically heal without complications.
Active eye infections or inflammation of the conjunctiva can also weaken blood vessels and make bleeding more likely.
Certain systemic health conditions may coexist with subconjunctival hemorrhages, though they are not the most common direct causes. High blood pressure, blood disorders, and anticoagulation therapy remain the primary medical risk factors.
- Connective tissue disorders that affect blood vessel strength
- Blood disorders that change clotting function
- Rare vascular abnormalities
- Systemic vascular disease in patients with long-standing diabetes or other conditions
How We Examine Your Eye
When you visit us for a blood spot, we will carefully examine your eye using a special microscope called a slit lamp. This instrument allows us to see the layers of your eye in detail and confirm that the bleeding is confined to the area beneath the conjunctiva.
Depending on your symptoms and history, we may also perform additional exam steps to ensure your eye is healthy.
- Checking your visual acuity to confirm your sight is clear
- Examining your pupils and their response to light
- Evaluating the corneal surface with a special dye if we suspect a scratch or abrasion
- Gently lifting your eyelid if a foreign body might be present
- Measuring your eye pressure when clinically appropriate
Understanding what might have caused your hemorrhage helps us provide the best care. We will ask about recent activities, medications, and your overall health history.
- Whether you remember any trauma or injury to your eye
- If you have been coughing, sneezing, or straining
- What medications and supplements you currently take
- Whether this is your first hemorrhage or if you have had others
- Any history of bleeding problems or easy bruising
Most patients with a single, uncomplicated blood spot do not need lab work. However, we may recommend blood tests if you have recurring hemorrhages, a history of bleeding disorders, or other concerning symptoms.
These tests can assess your clotting function and platelet count to identify any underlying issues that need treatment. For patients taking warfarin, checking the level of anticoagulation may help guide adjustments when appropriate.
We often measure blood pressure during your visit, especially if you have risk factors for hypertension. Elevated blood pressure discovered during an eye exam sometimes provides the first clue that your cardiovascular health needs attention.
If we find high blood pressure, we may suggest follow-up with your primary care doctor for proper management.
Treatment and What to Expect as It Heals
In most cases, a subconjunctival hemorrhage does not require any medical treatment. Your body will naturally absorb the trapped blood over time, just as it heals a bruise on your skin.
There is usually no treatment needed to make the blood spot clear faster, and care is mainly supportive. We recommend avoiding leftover prescription eye drops, especially steroid drops, unless our eye doctor specifically directs you to use them. If you take a prescribed blood thinner for a medical reason, continue your medication and discuss any concerns with your prescribing physician rather than stopping on your own.
The blood spot typically takes between one and three weeks to completely disappear. The exact timeline depends on the size of the hemorrhage and your individual healing rate.
- Small spots may clear within seven to ten days
- Larger hemorrhages can take up to three weeks
- The blood does not drain out or wash away
- Your body gradually reabsorbs the blood cells
If your eye feels scratchy or mildly irritated, we may recommend over-the-counter artificial tears to help soothe the surface. These lubricating drops can make your eye feel more comfortable while it heals.
Use preservative-free artificial tears if you need to apply drops more than four times a day, as this reduces the risk of irritation from preservative chemicals. Additional supportive measures can help you stay comfortable during healing.
- Avoid rubbing your eyes, which can cause further irritation
- Pause contact lens wear temporarily if your eye feels uncomfortable
- Apply a cool compress gently over your closed eyelid for comfort if desired
- Maintain good hand and eye hygiene to prevent infection
As your body breaks down and reabsorbs the blood, the spot will change color in a pattern similar to a healing bruise. You may notice the bright red gradually shifting to orange, then yellow, and finally fading away completely.
This color change is a normal and healthy sign that your eye is healing properly.
If we identify a specific medical condition that caused your hemorrhage, our focus shifts to managing that underlying problem. For example, we may work with your primary doctor to improve blood pressure control or adjust blood-thinning medications.
Treating the root cause can help prevent future hemorrhages and protect your overall health.
Patients who develop multiple subconjunctival hemorrhages over time need a more thorough evaluation. We will look for patterns and investigate possible systemic causes that might be contributing to repeated bleeding.
Depending on what we find, we may refer you to other specialists who can help manage conditions affecting your blood vessels or clotting system.
Frequently Asked Questions
A simple subconjunctival hemorrhage does not affect your vision because the bleeding stays on the surface of your eye, far away from the lens and retina that control sight. If you notice any vision changes along with a blood spot, that suggests a different problem requiring immediate evaluation.
The bleeding from a subconjunctival hemorrhage remains on the surface under the clear conjunctiva and does not involve the deeper structures inside your eye. However, the visible red area can enlarge over several hours as blood spreads beneath the membrane before it stabilizes.
The bleeding itself often stops on its own shortly after it starts, but the visible area may continue to expand for a time. Once the blood stops spreading, the spot will gradually shrink as your body absorbs it.
You can generally continue wearing contact lenses if your eye feels comfortable and you practice good hygiene. However, if your eye feels irritated or if inserting the lens causes discomfort, we recommend switching to glasses temporarily until the hemorrhage clears.
Normal physical activity will not make your hemorrhage worse once the bleeding has stopped. You can resume your regular exercise routine, including lifting weights, as long as you feel comfortable and have no other eye injuries or problems.
Never stop taking a prescribed blood thinner without consulting the doctor who prescribed it, as these medications protect against serious conditions like heart attack and stroke. If you take aspirin or another blood thinner for a medical reason, continue your medication and discuss any concerns with your prescribing physician.
While not all hemorrhages can be prevented, you can reduce your risk by managing underlying health conditions, avoiding vigorous eye rubbing, and being gentle when inserting or removing contact lenses. If you have recurring blood spots, work with our eye doctor to identify and address any contributing factors specific to your situation.
Getting Help for Blood Spot on the Eye (Subconjunctival Hemorrhage)
If you notice a blood spot on your eye, our eye doctor can evaluate your condition and provide reassurance that your eye is healthy. While most hemorrhages are harmless and heal on their own, we are here to answer your questions, check for underlying causes, and ensure you receive appropriate care if any complications arise.