Conjunctival Bleeding - Causes, Treatment & When to See a Doctor

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What is Conjunctival Bleeding?

Conjunctival bleeding, also called a subconjunctival hemorrhage, occurs when tiny blood vessels (capillaries) beneath the clear membrane that covers the white part of the eye (the conjunctiva) rupture. Blood then pools under the conjunctiva, creating a bright red or reddish‑purple patch that can be striking but is usually painless.

The condition is generally benign and often resolves on its own within 1–2 weeks. However, because it can be a sign of an underlying ocular or systemic problem, understanding its causes and when to seek care is essential.

Sources: Mayo Clinic, American Academy of Ophthalmology (AAO), National Eye Institute (NEI)

Common Causes

Most subconjunctival hemorrhages are isolated events, but they can be triggered by a variety of local or systemic factors. Below are the 10 most frequently reported causes:

• Mechanical trauma – rubbing the eye vigorously, a minor scratch, or a direct blow.
• Sudden increase in venous pressure – heavy lifting, coughing, sneezing, or straining during bowel movements (Valsalva maneuver).
• Eye rubbing or excessive eye rubbing – especially common in people with allergies.
• Anticoagulant or antiplatelet medications – warfarin, clopidogrel, aspirin, or newer agents like dabigatran.
• Systemic hypertension (high blood pressure) – makes fragile conjunctival vessels more likely to rupture.
• Bleeding disorders – hemophilia, von Willebrand disease, or platelet function defects.
• Contact lens wear – improper fitting or poor hygiene can irritate the conjunctiva.
• Infections – bacterial, viral (e.g., adenovirus), or fungal conjunctivitis that inflames and weakens vessels.
• Eye surgeries or procedures – cataract extraction, laser treatment, or intra‑ocular injections.
• Systemic diseases – diabetes mellitus, diabetes‑related microvascular disease, or autoimmune conditions such as systemic lupus erythematosus.

In many cases, no clear trigger is identified; these are termed “idiopathic” subconjunctival hemorrhages.

Associated Symptoms

While a subconjunctival hemorrhage itself is painless, it can appear alongside other ocular or systemic signs that help pinpoint the underlying cause:

• Itching, burning, or watery discharge (often linked to allergies or infection).
• Redness that spreads beyond the hemorrhage, suggesting conjunctivitis.
• Blurred or decreased vision – may indicate a more serious condition like a retinal bleed.
• Eye pain, pressure, or a sensation of a foreign body.
• Headache or facial pain, especially if associated with sinus disease or hypertension.
• Bleeding elsewhere (e.g., gums, nose) suggesting a systemic bleeding tendency.
• Recent use of anticoagulants or a change in dosage.

Identifying these associated features assists clinicians in deciding whether further work‑up is needed.

When to See a Doctor

Most subconjunctival hemorrhages are harmless, but you should schedule an eye‑care appointment if any of the following are present:

• Vision changes (blurred, double, or loss of vision).
• Severe eye pain, a gritty feeling, or pressure.
• Recurrent or multiple hemorrhages in a short period.
• Bleeding from the nose, gums, or elsewhere without obvious cause.
• History of recent eye surgery, trauma, or a new contact lens.
• Use of blood‑thinning medication and a sudden, large bleed.
• Systemic symptoms such as unexplained fever, headache, or signs of infection.

Prompt evaluation ensures that a serious underlying condition is not missed.

Diagnosis

Diagnosis is primarily clinical, based on a thorough eye examination. The typical steps include:

1. Medical history – questions about recent trauma, medication use, systemic diseases, and symptom onset.
2. Visual acuity test – to confirm that vision is unaffected.
3. Slit‑lamp examination – a magnified view of the conjunctiva and surrounding structures to assess the size, location, and any accompanying inflammation.
4. Intraocular pressure measurement – to rule out glaucoma if there’s concern for elevated pressure.
5. Fundoscopic exam – checking the retina and optic nerve for deeper hemorrhages, especially if visual changes are reported.
6. Laboratory tests (if indicated) – complete blood count (CBC), coagulation profile (PT/INR, aPTT), and blood pressure measurement when systemic causes are suspected.

Imaging (CT or MRI) is rarely required unless there is suspicion of orbital trauma or an intra‑ocular bleed.

Source: American Academy of Ophthalmology Clinical Practice Guidelines, 2023

Treatment Options

Because the blood under the conjunctiva is not harmful, most cases require only reassurance and simple at‑home measures. Treatment varies according to the underlying cause.

Conservative / Home Care

• Cold compress – Apply a clean, cold (not ice‑cold) compress for 10‑15 minutes, 3–4 times daily during the first 24–48 hours to reduce any associated swelling.
• Lubricating eye drops (artificial tears) – Help soothe irritation if the eye feels dry or itchy.
• Avoid rubbing – Reduces the risk of enlarging the bleed.
• Protective eyewear – When engaging in activities with a risk of eye injury.

Medical Management

• Adjustment of anticoagulant therapy – If a medication is contributing, the prescribing physician may modify the dose or switch agents after weighing the risk of thrombosis.
• Treatment of underlying infection – Topical antibiotics or antiviral agents for bacterial or viral conjunctivitis.
• Control of hypertension – Lifestyle changes and antihypertensive medication as directed by a primary‑care or cardiology provider.
• Management of bleeding disorders – Hematology referral for factor replacement, desmopressin, or platelet therapy as appropriate.
• Surgical intervention – Rarely required; a surgeon may gently irrigate or remove a large clot if it threatens the cornea or visual axis.

Follow‑up

Most hemorrhages resolve within 1–2 weeks. If the red patch persists longer than three weeks, worsens, or is accompanied by new symptoms, a follow‑up visit is warranted.

Prevention Tips

While not all subconjunctival hemorrhages can be prevented, the following strategies reduce risk:

• Manage blood pressure – Regular monitoring, a low‑salt diet, exercise, and medication adherence.
• Use anticoagulants under close supervision – Attend all follow‑up labs (e.g., INR for warfarin) and report any unusual bleeding.
• Practice safe eye hygiene – Wash hands before handling contacts, replace lenses as scheduled, and avoid sleeping in contacts unless approved.
• Limit vigorous rubbing – Treat allergies with antihistamine eye drops or oral medications.
• Wear protective eyewear – When doing yard work, sports, or any activity with a risk of impact.
• Avoid Valsalva‑type strain – Use proper lifting techniques, avoid excessive sneezing or coughing without support, and treat chronic constipation gently.
• Maintain good systemic health – Control diabetes, avoid smoking, and get regular check‑ups.

Emergency Warning Signs

In summary, conjunctival (subconjunctival) bleeding is usually a harmless, self‑limiting event, but it can sometimes signal underlying health issues. Understanding the causes, knowing the associated symptoms, and recognizing red‑flag warnings empower patients to seek appropriate care promptly.

References:

• Mayo Clinic. Subconjunctival hemorrhage. 2023.
• American Academy of Ophthalmology. Clinical Practice Guidelines for Ocular Hemorrhages. 2023.
• National Eye Institute (NEI). Eye health information. 2022.
• Centers for Disease Control and Prevention (CDC). Hypertension and eye health. 2022.
• Cleveland Clinic. Eye bleeding (subconjunctival hemorrhage). 2024.

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