Blood Clot in Eye: Symptoms, Red Flags, and Treatment

There’s a moment of alarm when you glance in the mirror and see a bright red patch on your eye—often a harmless subconjunctival hemorrhage that clears up in two weeks, but sometimes an eye stroke that needs urgent care. Knowing the difference is what this guide covers.

Medical term: Subconjunctival hemorrhage ·
Typical appearance: Bright red patch on the white of the eye ·
Pain: Usually none ·
Vision change: Usually none ·
Typical recovery time: 1–2 weeks

Quick snapshot

1Confirmed facts

Distinct red patch on the white of the eye (Mayo Clinic)
Painless with no vision change (Cleveland Clinic)
Resolves in 1–2 weeks (Merck Manual)

2What’s unclear

Exact trigger for a specific episode is often unknown (American Optometric Association)
Direct link to stress or poor sleep not clearly proven (American Academy of Ophthalmology)
Why some individuals get recurrent hemorrhages (American Optometric Association) (American Optometric Association)

3Timeline signal

First minutes: sudden red patch appears (Mayo Clinic)
First 24 hours: patch stable, vision normal (Merck Manual)
Days 1–7: color fades, turns yellow or brown (American Optometric Association)
Week 2: usually fully resolved (Merck Manual)

4What’s next

If pain, vision change, or recurrence: seek evaluation (Merck Manual) (MedlinePlus)
Urgent care for sudden vision loss (possible eye stroke) (MedlinePlus)

Key facts at a glance

Four core facts define the condition and its severity.

Medical name	Subconjunctival hemorrhage
Where it occurs	Under the conjunctiva on the white of the eye
Usual symptoms	Bright red patch, no pain, no vision change (Mayo Clinic)
Healing time	About 1–2 weeks (Merck Manual)

The pattern: The table compresses the essential diagnosis into four fixed points, so there is no reason to read a red eye as anything more than a surface event unless one of those points changes.

How do you know if you have a blood clot?

What does a subconjunctival hemorrhage look like?

A subconjunctival hemorrhage appears as a sharply demarcated bright-red patch on the white of the eye (Mayo Clinic). It can look alarming but is usually painless and does not affect vision (American Academy of Ophthalmology).

What could be causing a bloodshot eye on one side?

A one-sided bloodshot eye from a subconjunctival hemorrhage can result from coughing, sneezing, straining, or minor trauma (Mayo Clinic). It can also stem from an underlying vascular condition or high blood pressure (American Academy of Ophthalmology).

What can be mistaken for subconjunctival hemorrhage?

A retinal vein occlusion can cause a bloodshot appearance but presents primarily with sudden vision loss and floaters, not just a red patch (MedlinePlus).

The pattern: If the eye is red but there is no pain, blur, or flash of floaters, the cause is almost certainly a harmless surface bleed.

What are the red flags for a subconjunctival hemorrhage?

Is a blood clot in the eye dangerous?

A subconjunctival hemorrhage is usually harmless and clears on its own (Harvard Health). A true eye stroke, such as a retinal vein occlusion, is dangerous and needs rapid treatment (Merck Manual).

When should a red spot in the eye be checked?

Seek urgent care if the red spot follows trauma or is accompanied by pain, vision change, or headache (Merck Manual). Recurrent hemorrhages or bleeding while on blood thinners should be evaluated (American Optometric Association).

The catch

A bright red eye is almost always a harmless subconjunctival hemorrhage. The danger is when a patient assumes vision loss is part of the same benign event. Any blurring or dark spot warrants an immediate exam, not a wait-and-see.

The pattern: Surface reddening alone is rarely the problem. Pain, blurring, or recurrence shifts the calculus to urgent.

Does a broken blood vessel in the eye indicate a stroke?

What are the symptoms of a mini stroke in the eye?

A broken vessel on the white of the eye is not itself a stroke (Mayo Clinic). A retinal vein occlusion is often called an eye stroke and is a blockage of a retinal blood vessel (EyeWiki, American Academy of Ophthalmology). Sudden vision loss or transient monocular blindness can be a warning sign of cerebrovascular disease.

Can a broken blood vessel in the eye be caused by stress?

Stress-related high blood pressure may increase the risk of vascular eye events (Mayo Clinic). Whether stress alone directly causes a subconjunctival hemorrhage remains unconfirmed (American Academy of Ophthalmology).

The catch: One is a cosmetic blemish, the other a hematologic event. They aren’t interchangeable, but people routinely confuse them.

How is a retinal hemorrhage treated?

What is the treatment for a blood spot in the eye?

Subconjunctival hemorrhage usually needs no treatment and resolves in 1–2 weeks (American Academy of Ophthalmology). Retinal vein occlusion may be treated with anti-VEGF injections, laser, or vitrectomy (Merck Manual).

What is the treatment for a red dot in a baby’s eye?

A red dot in a baby’s eye should be examined by a doctor to rule out injury or other causes (Nemours KidsHealth).

The trade-off: Waiting for a surface bleed to heal costs nothing. Waiting on a retinal bleed costs vision.

How long does it take for a subconjunctival hemorrhage to clear up?

Will a red spot in the eye go away?

Most subconjunctival hemorrhages clear up within two weeks (Merck Manual). The red color may fade and turn yellow or brown before disappearing.

Can a subconjunctival hemorrhage be caused by lack of sleep?

Lack of sleep is not a typical direct cause; coughing, sneezing, straining, or eye rubbing are more common triggers (Mayo Clinic).

The limitation: The color change is reassuring, but the absence of other symptoms confirms a benign course.

What should I avoid doing if a blood vessel bursts in my eye?

Why would a blood vessel suddenly burst in my eye?

Sudden bursting can happen from trauma, eye rubbing, coughing, sneezing, straining, vomiting, and contact-lens irritation (Mayo Clinic).

How can I soothe eye irritation after a subconjunctival hemorrhage?

Avoid rubbing the eye while the hemorrhage heals (American Academy of Ophthalmology). Use artificial tears for comfort if the eye feels scratchy (Cleveland Clinic). Seek immediate medical attention for sudden vision loss, severe pain, or a hemorrhage after head trauma (Merck Manual).

What this means: Most cases are self-managing. The risk is over-reacting to a harmless spot or under-reacting to a true vascular event.

Subconjunctival hemorrhage vs. retinal vein occlusion

Two conditions travel under the name “blood clot in the eye,” but the biological difference determines whether the treatment is watchful waiting or a call to urgent care.

Feature	Subconjunctival Hemorrhage	Retinal Vein Occlusion
Location of bleeding	Under the conjunctiva	Inside the retinal vein
Visible red patch	Yes, bright red on white of eye	No external sign (MedlinePlus)
Pain	Usually none (Mayo Clinic)	None, but urgent vision loss
Vision change	None	Sudden blurring or loss
Treatment	None needed (American Academy of Ophthalmology)	Anti-VEGF, laser, vitrectomy
Recovery time	1–2 weeks	Variable, often needs ongoing care

The pattern: Surface bleeds manage themselves. Retinal blockages require rapid, often repeated, intervention.

First steps for managing a burst blood vessel

In the first 24 hours, a few deliberate actions separate a smooth recovery from a complication.

Do not rub the eye. Rubbing can worsen the bleeding or introduce infection (American Academy of Ophthalmology).
Apply artificial tears. If the eye feels dry or scratchy, use preservative-free artificial tears (Cleveland Clinic).
Avoid changing medication on your own. Do not stop or adjust blood thinners without consulting your doctor (American Academy of Ophthalmology).
Monitor symptoms for 24 hours. If vision blurs or pain develops, see an ophthalmologist immediately (Merck Manual).

The upshot

For a typical subconjunctival hemorrhage, the treatment plan is patience. No drops, no patching, no urgent care. The eye will clear itself within two weeks, just as it heals a bruise anywhere else on the body.

The upshot: The first 24 hours are about restraint and observation, not intervention.

Recovery timeline

The progression follows a predictable schedule that can reassure anyone watching a red spot on their eye.

Timeframe	What happens
First minutes	Bright red patch appears suddenly, often after coughing, sneezing, straining, or minor injury (American Optometric Association).
First 24 hours	Patch may stay the same or spread slightly; pain and vision are normal (Merck Manual).
Days 1–7	The blood begins to fade; the patch may turn slightly yellow or brown.
Week 2	Most subconjunctival hemorrhages resolve fully; if not, a medical check is advised (Mayo Clinic).

The pattern: Predictable healing with no intervention. Any deviation warrants a clinical look.

What we know and what remains uncertain

What we know

A subconjunctival hemorrhage appears as a bright red patch on the white of the eye (Mayo Clinic).
It is usually painless and does not affect vision (Mayo Clinic).
It generally resolves on its own within two weeks (Merck Manual).
A subconjunctival hemorrhage is not the same as a retinal vein occlusion (MedlinePlus).

What remains uncertain

The exact trigger of a particular subconjunctival hemorrhage is not always identified (MedlinePlus).
Whether stress or sleep deprivation directly cause the hemorrhage is not clearly proven (American Academy of Ophthalmology).
Why some people experience recurrent subconjunctival hemorrhages is not fully understood (American Optometric Association).
Whether a single hemorrhage on blood thinners warrants a medication change is not protocolized (American Academy of Ophthalmology).

The asymmetry: Most red eyes are benign, but the missing pain or vision change is the key discriminator—and uncertainty is highest when those symptoms appear.

Authoritative perspectives

A subconjunctival hemorrhage is blood collecting beneath the conjunctiva, the transparent membrane over the white of the eye. It typically appears as a sharply demarcated bright-red patch.

Merck Manual Consumer Version

A broken blood vessel in the eye is usually not serious and resolves in about two weeks.

Harvard Health

A red spot on a child’s eye can look scary but is usually harmless, painless, and does not affect vision.

Nemours KidsHealth

Summary

For anyone staring at a red spot in their eye, the distinction is everything. A subconjunctival hemorrhage demands patience and nothing else. A retinal vein occlusion demands immediate medical attention to preserve vision. Knowing which one you are looking at—by checking for pain, blurring, and floaters—is the single most important step you can take. For the average adult who sees a bright patch after a cough or a workout, the response is zero action. For anyone who simultaneously loses clarity in that eye, the response is an urgent same-day ophthalmology visit.

Additional sources

my.clevelandclinic.org

Frequently asked questions

What should I do if I wake up with a blood spot in my eye?

Observe it. Check if there is any pain, blurring, or foreign body sensation. If the spot is the only change, no action is needed—it will clear on its own within two weeks (Harvard Health). If you experience vision loss or pain, contact a doctor immediately.

Can a subconjunctival hemorrhage be a sign of high blood pressure?

Yes, high blood pressure is a recognized association. The American Academy of Ophthalmology lists hypertension as a risk factor (American Academy of Ophthalmology). If you experience recurrent hemorrhages, a medical evaluation for systemic conditions like high blood pressure is advisable.

Is a retinal hemorrhage the same as a subconjunctival hemorrhage?

No. A retinal hemorrhage occurs inside the eye, in the retina, and can affect vision. A subconjunctival hemorrhage occurs on the surface of the eye and does not affect vision (American Optometric Association). Retinal hemorrhages are often linked to conditions like diabetes, trauma, or retinal vein occlusion.

Should I stop blood-thinning medication if I have a red spot in my eye?

No. Do not stop or change blood-thinning medication without consulting the prescribing doctor (American Academy of Ophthalmology). While these medications can increase the risk of bleeding, an isolated subconjunctival hemorrhage is not typically a reason to alter your regimen.

When does a red spot in a baby’s eye need urgent care?

A red spot in a baby’s eye should be examined by a doctor, particularly if it follows a fall or bump, appears repeatedly, or is accompanied by pain or changes in the child’s vision or behavior (Nemours KidsHealth).

Can a blood vessel in the eye burst more than once?

Yes. Recurrent subconjunctival hemorrhages are possible, especially in individuals with predisposing conditions like high blood pressure, diabetes, or on blood thinners (American Optometric Association). Recurrent episodes should be evaluated to rule out an underlying bleeding disorder or systemic disease.