[Clinical Edge] Can High Blood Pressure Cause Bleeding in the Eye?

 “Can high blood pressure make a blood vessel burst in my eye?”

Yes, high blood pressure can be associated with bleeding in the eye. However, not every eye hemorrhage is caused by hypertension.

The significance of the bleeding depends largely on where it occurs. A bright red patch on the white of the eye is usually very different from bleeding inside the retina.

What Types of Eye Bleeding Can Occur?

Eye bleeding can generally be divided into three categories:

• Subconjunctival hemorrhage: Blood trapped beneath the clear membrane covering the white of the eye
• Retinal hemorrhage: Bleeding within the light-sensitive retina at the back of the eye
• Vitreous hemorrhage: Bleeding into the clear gel that fills the inside of the eye

These conditions can look and feel very different, and they do not carry the same level of risk.

Can High Blood Pressure Cause a Red Patch on the White of the Eye?

A sharply defined, bright red patch on the white of the eye is usually a subconjunctival hemorrhage.

It happens when one of the tiny blood vessels beneath the conjunctiva breaks. Possible triggers include:

• A sudden rise in blood pressure
• Forceful coughing or sneezing
• Vomiting or straining
• Heavy lifting
• Rubbing the eye
• Minor eye trauma
• Taking blood thinners, aspirin, or certain other medications

In many cases, however, no clear cause can be identified.

A subconjunctival hemorrhage may look alarming, but it is usually painless and does not affect vision. Having one does not automatically mean that your blood pressure is dangerously high.

How Does High Blood Pressure Affect the Retina?

Long-standing or severely elevated blood pressure can damage the small blood vessels in the retina. This condition is called hypertensive retinopathy.

An eye examination may reveal:

• Narrowing of the retinal arteries
• Retinal hemorrhages
• Cotton-wool spots caused by reduced blood flow
• Hard exudates from leaking blood vessels
• Macular swelling
• Optic nerve swelling in severe cases

Early hypertensive retinopathy often causes no noticeable symptoms. It may be discovered during a dilated eye examination before the patient realizes that the retinal vessels have been affected.

The retinal findings may also provide useful information about how high blood pressure is affecting blood vessels elsewhere in the body.

Is Retinal Bleeding the Same as a Subconjunctival Hemorrhage?

No.

A subconjunctival hemorrhage is visible on the white surface of the eye. It usually looks dramatic but is often harmless.

A retinal hemorrhage occurs inside the eye and cannot usually be seen by looking in a mirror. It is detected with a retinal examination or retinal imaging and may be associated with hypertension, diabetes, retinal vein occlusion, blood disorders, or other vascular conditions.

This distinction is important: the bleeding that looks worse is not always the more dangerous type.

When Should You Seek Urgent Eye Care?

Seek prompt medical attention if eye bleeding is accompanied by:

• Sudden blurred or reduced vision
• A sudden increase in floaters
• A dark cloud, curtain, or shadow in your vision
• Flashes of light
• Eye pain
• Severe headache, weakness, confusion, chest pain, or shortness of breath
• Bleeding after a significant eye injury

These symptoms may indicate retinal bleeding, vitreous hemorrhage, retinal detachment, acute glaucoma, or another condition that requires urgent evaluation.

A blood pressure reading of 180/120 mmHg or higher, especially when accompanied by vision changes, chest pain, shortness of breath, neurological symptoms, or a severe headache, may represent a hypertensive emergency. In that situation, seek emergency medical care rather than waiting for a routine eye appointment.

Will a Subconjunctival Hemorrhage Go Away on Its Own?

Most uncomplicated subconjunctival hemorrhages clear without treatment within approximately one to three weeks.

The color may change from bright red to brown, yellow, or orange as the blood is gradually absorbed. This is similar to the way a bruise changes color while healing.

Artificial tears may help if the eye feels mildly irritated, but they do not make the blood disappear more quickly.

Should You Check Your Blood Pressure?

Checking your blood pressure is reasonable, particularly if:

• The hemorrhage occurred without an obvious trigger
• It keeps recurring
• You already have hypertension or diabetes
• You have not had your blood pressure checked recently
• You have bleeding or easy bruising elsewhere
• You take blood-thinning medication

Do not stop aspirin, anticoagulants, or other prescribed medications on your own. Discuss recurrent bleeding with the clinician who prescribed them.

Does Recurrent Eye Bleeding Require Testing?

Repeated subconjunctival hemorrhages may justify further evaluation.

Depending on your medical history, a clinician may review:

• Blood pressure control
• Diabetes
• Blood-thinning medications
• Platelet count and blood-clotting function
• Recent trauma or eye rubbing
• Other unexplained bleeding or bruising

An eye examination is especially important when the diagnosis is uncertain or when vision is affected.

Key Takeaway

High blood pressure can contribute to eye bleeding, but not every broken blood vessel in the eye is caused by hypertension.

A painless red patch on the white of the eye is usually a subconjunctival hemorrhage and often resolves on its own. Bleeding accompanied by vision loss, new floaters, flashes, a dark curtain, eye pain, or symptoms of severely elevated blood pressure requires prompt medical attention.

Disclaimer: This article provides general educational information and is not a substitute for an examination, diagnosis, or treatment by a qualified healthcare professional.