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Blood in the eye most often refers to a subconjunctival hemorrhage, a bright red patch under the clear surface layer of the white of the eye. It looks dramatic but is usually harmless and painless. The blood spreads then clears over 1 to 3 weeks as it reabsorbs. Rarely, bleeding inside the eye after trauma is more serious and needs urgent care.
read more about blood in the eye ...Sudden increases in venous pressure from coughing, sneezing, or heavy lifting can break tiny surface vessels. Blood thinners, high blood pressure, and diabetes increase the chance of bleeding. Trauma and eye rubbing are additional triggers. A clinician rules out internal injury when the history suggests it.
When a surface vessel bursts, bright red blood spreads under the clear conjunctiva. It looks dramatic but usually doesn't affect vision, and the body gradually absorbs the trapped blood within days.
You should see your eye doctor if you notice sudden or persistent changes in your vision such as blurriness, flashes of light, floaters, or eye pain. Redness, swelling, or discharge that does not improve with basic care also warrants a checkup. Even if symptoms seem mild, getting a professional evaluation can help detect problems early and prevent complications. Regular eye exams are also important to monitor your overall eye health and keep your vision clear.
No specific treatment is needed for a simple subconjunctival hemorrhage; lubricating drops can ease mild irritation. Avoid blood thinning supplements without medical advice. If trauma or pain is present, an exam checks for deeper damage. Most patches fade completely without affecting vision.
See a clinician if bleeding follows an injury, recurs frequently, or comes with pain, light sensitivity, or vision changes. People on anticoagulants should notify their prescriber. Sudden large bleeds may warrant blood pressure checks. Proper evaluation provides reassurance and safety.
Manage blood pressure, treat allergies that provoke rubbing, and use protective eyewear during risky activities. Gentle eyelid hygiene reduces irritation. For recurrent cases, your clinician may review medications and order labs. Prevention focuses on triggers and overall health.
Will it spread? The red area can shift with gravity before fading.
Can I wear contacts? Yes if the eye is comfortable and uninjured.
Do cold compresses help? They can soothe but do not speed clearing.
“What is a Subconjunctival Hemorrhage?” American Academy of Ophthalmology (AAO). https://www.aao.org/eye-health/diseases/what-is-subconjunctival-hemorrhage. Published Sep 30, 2024.
“Subconjunctival Hemorrhage.” Cleveland Clinic. https://my.clevelandclinic.org/health/diseases/17713-subconjunctival-hemorrhage. Published Jun 28, 2023.
“Subconjunctival hemorrhage.” MedlinePlus Medical Encyclopedia. https://medlineplus.gov/ency/article/001616.htm. Published Apr 29, 2025.
“Subconjunctival Hemorrhage.” MSD Manuals Consumer Version. https://www.msdmanuals.com/home/eye-disorders/conjunctival-and-scleral-disorders/subconjunctival-hemorrhage. Published Apr 2025.
“Subconjunctival Hemorrhage.” EyeWiki. https://eyewiki.org/Subconjunctival_Hemorrhage. Published Jan 26, 2025.