Spotted a bright‑red patch on the white of your eye overnight? It can look dramatic, but most of the time it’s a subconjunctival haemorrhage — a tiny blood vessel that’s burst under the eye’s clear surface skin (the conjunctiva). The blood becomes trapped against the white of the eye, so it looks vivid and doesn’t move or wipe away. For most people there’s no pain, no discharge and no change in vision. Think of it like a bruise on the eye’s surface: startling to see, usually harmless, and it typically clears on its own within days to a couple of weeks.
In this guide, we’ll explain how serious a “busted blood vessel” usually is, the symptoms to expect versus warning signs that aren’t typical, common causes and triggers, how long healing takes, and simple home care — plus what to avoid. You’ll learn when to see a doctor (and when to call 000), who’s at higher risk or gets repeat episodes, possible links with high blood pressure, diabetes or stroke, other red‑eye conditions that can look similar, special situations (contact lenses, blood thinners, pregnancy/childbirth, children, after eye surgery), and what to expect at an eye specialist appointment.
Is a busted blood vessel in the eye serious?
Most cases are harmless and don’t affect sight. A subconjunctival haemorrhage is like a skin bruise — blood trapped under the conjunctiva — and it usually clears without treatment within a few days to two weeks. It isn’t an infection and doesn’t turn into blindness. However, it can rarely follow trauma or reflect issues like high blood pressure, diabetes or blood‑thinning medicines. See a clinician promptly if it follows an eye injury, you have pain, light sensitivity or blurred vision, or the spots keep recurring.
Symptoms to expect (and warning signs that aren’t typical)
With a busted blood vessel in the eye (subconjunctival haemorrhage), the classic sign is a sharply defined, bright‑red patch on the white of the eye. There’s usually no pain, no discharge and no change in vision, though a mild scratchy or itchy feeling is common. As it heals, the red area can spread a little and then fade to yellow.
- Red flags: Eye pain, light sensitivity or blurred vision.
- Injury or discharge: Not usual for a simple haemorrhage.
- Recurring episodes or easy bruising: See your doctor and have your blood pressure checked, especially if you’re on blood thinners.
Common causes and triggers
A busted blood vessel in the eye (subconjunctival haemorrhage) happens when a tiny capillary under the conjunctiva breaks. Brief spikes in pressure in the head and neck, or minor irritation or trauma to the eye surface, are typical culprits. It can also appear out of the blue with no obvious cause and isn’t usually serious.
- Straining: Coughing, sneezing, vomiting or on the toilet.
- Effort: Heavy lifting, pushing or bending forward.
- Rubbing the eye: Especially if dry or itchy.
- Minor knocks: A bump or accidental poke; eye/head injury.
- Contact lenses: Friction or surface irritation; infection.
- After eye surgery: Common and usually harmless.
- Medicines: Blood thinners (e.g., warfarin, aspirin) and interferon.
- Underlying factors: High blood pressure, diabetes, or clotting disorders can make it more likely.
How long it takes to heal
Most subconjunctival haemorrhages clear on their own in 1–2 weeks, though larger patches can take up to three. As a busted blood vessel in the eye heals, the red area may spread slightly before shrinking, then shift from red to brown/yellow — like a fading bruise. There’s no way to speed healing. If it isn’t improving after two weeks or persists beyond three, book a check‑up.
Home care: what helps and what to avoid
For a simple subconjunctival haemorrhage, home care is mostly about comfort while the eye quietly heals itself. No treatment is needed; the trapped blood will be re‑absorbed over 1–2 weeks. Artificial tears can soothe any scratchy feeling — and don’t try to wipe the red patch off, or rub the eye.
- Use artificial tears: As needed to ease irritation.
- Don’t rub your eyes: It can reopen tiny vessels.
- Contact lenses: Wear glasses if there’s any discomfort.
- Blood thinners: Keep taking them; don’t stop without medical advice.
- No quick fix: You can’t speed healing; colours may fade to yellow.
- Check blood pressure: Especially if episodes are frequent or recurring.
When to see a doctor (and when to call 000)
Most subconjunctival haemorrhages don’t need urgent care and clear on their own. Still, a quick check is sensible if anything feels off, if you’re on certain medicines, or if these patches keep happening. A clinician can confirm it’s benign, check your blood pressure and rule out less common problems.
See a doctor/optometrist if: it followed an eye injury; you have eye pain, light sensitivity or blurred vision; there’s discharge; the haemorrhage is large or recurrent; you bruise/bleed easily; you wear contact lenses and the eye feels irritated; you take blood thinners (e.g., warfarin, aspirin) or have diabetes/high blood pressure.
Call 000 or go to emergency: after significant eye or head trauma, with sudden vision loss, severe eye pain, or if you notice blood collecting in front of the iris (possible hyphema).
Who is at higher risk or gets it repeatedly
Some people are more likely to get a busted blood vessel in the eye more than once. Repeat subconjunctival haemorrhages can reflect underlying tendencies or repeated triggers; about 1 in 10 people without clear risk factors have a recurrence, and rates are higher when risk factors are present.
- Older age (65+) and vascular conditions like high blood pressure or diabetes.
- Blood thinners (e.g., warfarin, aspirin) or clotting disorders.
- Contact lens wearers (surface friction/irritation).
- After eye surgery.
- Frequent straining or rubbing: coughing, sneezing, vomiting, constipation, heavy lifting.
If episodes are frequent, have your blood pressure checked and speak with your GP/optometrist to review medicines and rule out bleeding problems.
Can a burst blood vessel be linked to stroke, high blood pressure or diabetes?
A busted blood vessel in the eye (subconjunctival haemorrhage) is not a sign of stroke. It’s a local surface bleed, unrelated to brain circulation, and is usually harmless. However, high blood pressure and diabetes are recognised risk factors, and blood‑thinning medicines can make these bleeds more likely. If episodes recur or you bruise easily, it’s sensible to have your blood pressure checked and speak with your GP about cardiovascular risk and bleeding/clotting issues.
- Not a stroke warning: Seek urgent care only with neurological symptoms or vision loss.
- Check your blood pressure: Especially with first or repeated episodes.
- On blood thinners? Don’t stop them without medical advice.
Preventing future episodes
You can’t always prevent a busted blood vessel in the eye (subconjunctival haemorrhage), but reducing triggers and managing health risks may lower recurrences. Focus on protecting the eye’s surface and avoiding sudden pressure spikes, while keeping blood pressure and other risk factors in check.
- Avoid rubbing: use artificial tears for dryness/itch.
- Reduce straining: treat cough/constipation; limit heavy lifting.
- Protect eyes: clean contacts, correct fit, safety eyewear.
- Check blood pressure/diabetes: review blood thinners with your GP.
Not all red eyes are the same: other conditions that can look similar
A subconjunctival haemorrhage is a sharply outlined, bright‑red patch on the white of the eye with no pain, discharge or vision change. If your whole eye looks diffusely red, feels sore, light‑sensitive or sticky, it may be something else that needs different care.
- Conjunctivitis (pink eye): Redness with discharge, crusting or itch isn’t typical of a simple busted blood vessel in the eye.
- Corneal surface problems (scratch/infection): Usually cause significant pain, watering, light sensitivity and sometimes blurred vision.
- Hyphema: A visible pool of blood in front of the iris is urgent — seek immediate care.
- Trauma‑related red eye: Any redness after a significant eye or head injury should be checked promptly.
Special situations: contact lenses, blood thinners, pregnancy/childbirth, children and after eye surgery
A busted blood vessel in the eye is usually benign, but a few situations call for tailored advice. These tips can help you stay safe while the subconjunctival haemorrhage settles and reduce the chance of repeat episodes.
Contact lenses: Switch to glasses if there’s any irritation. Clean lenses meticulously and review fit/dry eye with your optometrist. Don’t wear lenses again until the eye feels normal and there’s no discharge or pain.
Blood thinners (e.g., warfarin, aspirin): These can make bleeds more likely. Do not stop them without medical advice. If haemorrhages recur, see your GP to check blood pressure and review dosing/INR where relevant.
Pregnancy/childbirth: Straining during labour can trigger a subconjunctival haemorrhage. It’s usually harmless and clears on its own. If episodes are frequent, have your blood pressure checked and mention it at antenatal visits.
Children/newborns: Common after childbirth and typically resolves within 2–3 weeks. Seek care if there’s eye pain, discharge, vision concerns, or if it follows significant trauma.
After eye surgery: Red patches on the white of the eye are common and usually harmless post‑op. Follow your surgeon’s instructions; call promptly if you develop pain, light sensitivity or blurred vision.
What happens at an eye specialist appointment
An eye specialist visit is straightforward. The goal is to confirm the red patch is a subconjunctival haemorrhage, check your overall eye health, and make sure there’s no injury or underlying issue. Most people leave with reassurance, simple comfort measures, and advice on when to return if things don’t settle.
- History: When it appeared, any cough/sneeze/strain, knocks or rubbing, contact lens use, medicines (especially blood thinners), and conditions like high blood pressure or diabetes.
- Examination: Visual inspection of the eye surface and lids; if there’s been trauma, they’ll look carefully for complications or deeper injury.
- Blood pressure check: Commonly done at the visit.
- Further tests (if needed): If episodes recur or you bruise/bleed easily, they may order blood tests for clotting issues and review medicines.
- Treatment plan: Usually no treatment; artificial tears for irritation and guidance to avoid rubbing while it heals.
Care at Bright Sight Eye Specialists in Randwick
At Bright Sight Eye Specialists in Randwick, Dr Rahul Dubey’s team assesses red eye and a busted blood vessel in the eye, confirms subconjunctival haemorrhage, checks blood pressure and medicines, and rules out trauma. You’ll get reassurance, comfort drops and prevention advice. If an underlying issue is suspected, we’ll advise follow‑up with your GP. For related problems such as diabetic eye disease or retinal conditions, we offer advanced care, transparent pricing and no‑gap cataract options for eligible privately insured patients.
The bottom line
A busted blood vessel in the eye (subconjunctival haemorrhage) looks dramatic but is usually harmless, painless and doesn’t affect sight. Think bruise, not emergency. Most clear on their own in 1–2 weeks. Use artificial tears for comfort, avoid rubbing, pause contacts if irritated, and consider a quick blood pressure check if episodes are frequent or new.
See a clinician promptly if there’s eye pain, light sensitivity, blurred vision, discharge, a significant injury or repeat episodes — and call 000 with sudden vision loss, severe pain or after major trauma. If you’re unsure, book a straightforward assessment with Bright Sight Eye Specialists in Randwick for reassurance, practical care and next‑step guidance tailored to you.