10 Causes of Retinal Hemorrhage You Should Know

A retinal hemorrhage occurs when one or more blood vessels in the retina leak or rupture, causing bleeding within the light-sensitive tissue at the back of the eye. Because the retina plays a critical role in vision, any disruption to its blood supply can potentially affect eyesight, ranging from mild visual disturbances to significant vision loss in severe cases.

Retinal hemorrhages are not a disease themselves but rather a sign of an underlying medical condition or injury. They may be caused by diabetes, high blood pressure, eye trauma, blood disorders, or other health problems that affect blood vessels. In some cases, a retinal hemorrhage may develop without noticeable symptoms and only be discovered during a routine eye examination.

Understanding the potential causes of retinal hemorrhage is important because early diagnosis and treatment can help prevent complications and protect long-term vision. In this article, we’ll explore 10 causes of retinal hemorrhage you should know and explain why prompt medical evaluation is often necessary.

What Is a Retinal Hemorrhage?

A retinal hemorrhage is the medical term for bleeding that occurs within the retina, the light-sensitive nerve tissue lining the back of the eye. This condition arises when the delicate network of microscopic blood vessels supplying the retina ruptures or leaks.

To visualize this process, think of the retina as the film inside a camera. It captures incoming light and converts it into neural signals that travel to the brain for visual processing. When a bleeding retina develops, the pooled blood blocks or distorts the incoming light, creating a visual disturbance similar to an ink blot covering a photograph. Because the retina depends on a dense web of tiny arteries and veins for oxygen, a retina hemorrhage can quickly deprive nerve cells of vital nutrients.

Is Bleeding Behind the Eye Serious?

When patients encounter eye bleeding, a primary concern is determining is bleeding behind the eye serious. In a clinical setting, a retina bleeding event is classified as a serious warning sign because it is rarely a standalone issue. Instead, it serves as a clinical marker for major underlying local or systemic medical conditions.

The overall severity of a hemorrhaging retina is dictated by its root cause, its location, and the volume of blood lost. For instance, a minor bleed caused by physical trauma may resolve entirely on its own. Conversely, bleeding triggered by chronic conditions like diabetic retinopathy or high blood pressure signals that these diseases are actively damaging the body’s vascular infrastructure. This systemic damage increases a patient’s risk for significant vision impairment, strokes, or cardiac events.

How Retinal Bleeding Impacts Vision

A retinal hemorrhage compromises eyesight by physically obstructing the path of light to photoreceptor cells and by exposing delicate neural tissues to the cellular toxicity of stagnant blood. The specific visual symptoms depend heavily on where the blood accumulates within the ocular layers.

Central Vision Blind Spots

When bleeding behind retina tissue occurs in the macula—the center of the retina responsible for sharp, straight-ahead focus—the visual changes are immediate. Patients frequently notice wavy lines (metamorphopsia), blurry text, or a dark, empty blind spot directly in their central field of view.

Sudden Floaters and Cloudiness

If a larger blood vessel breaks, blood can escape the retinal layers entirely and pool inside the vitreous humor, the clear gel filling the center of the eye. This creates a sudden shower of dark, drifting floaters, a generalized reddish tint across the vision, or an abrupt curtain of darkness as the blood clouds the path of light.

Causes and Structural Identifiers

Isolating what causes bleeding behind the eyes requires a thorough examination by an ophthalmologist. Doctors categorize retinal hemorrhage causes based on whether they stem from localized ocular changes or systemic vascular strains.

Category	Primary Disease Drivers	Visual Impact & Manifestation
Systemic Conditions	Diabetic Retinopathy Hypertensive Retinopathy	Chronic high blood sugar weakens capillaries, creating tiny blood spots in retina tissue. High blood pressure strains and ruptures thin vessel walls.
Localized Ocular Issues	Wet Macular Degeneration (AMD) Retinal Vein Occlusion (RVO)	Wet AMD causes fragile, abnormal new vessels to grow and leak beneath the macula. Vein blockages cause a backup of pressure, triggering sudden bleeding behind the eye.

Determining what causes blood behind your eye or identifying what causes bleeding behind the retina is the first step toward preserving sight. By pinpointing the exact mechanism behind the broken blood vessels, your medical team can initiate targeted therapies to arrest the bleeding, clear the retinal layers, and protect your long-term visual health.

The 10 Primary Causes of Retinal Hemorrhage

A retinal hemorrhage can be triggered by structural shifts within the eye, environmental changes, or chronic systemic conditions. Because the retina’s blood vessel network is incredibly thin and fragile, it is highly sensitive to changes in blood pressure, oxygenation, and physical friction.

Understanding what causes bleeding behind the eyes involves evaluating how different diseases disrupt these delicate microvessels. The following breakdown covers the primary diagnostic categories encountered by eye care specialists when investigating retinal hemorrhage causes.

Metabolic and Systemic Pressures

Diabetic Retinopathy

Chronically elevated blood glucose is a leading driver of a hemorrhaging retina. In the early stage, known as non-proliferative diabetic retinopathy, high sugar levels structurally weaken capillary walls. This causes microscopic bulges called microaneurysms, which steadily leak fluid and form tiny blood spots in retina tissue.

As the disease enters the proliferative stage, blocked vessels cut off oxygen entirely. The starving retina responds by growing new, highly abnormal blood vessels. Because these new vessels are structurally defective, a simple cough, sneeze, or minor spike in blood pressure can cause them to rupture, pouring blood into the vitreous cavity and clouding vision.

Hypertensive Retinopathy

Sustained high blood pressure forces the body’s delicate ocular arteries to stiffen, narrow, and harden. This restricted blood flow deprives the tissue of vital oxygen. The stiffened, high-pressure arteries frequently compress neighboring retinal veins where they cross paths. This mechanical strain can cause the small vessels to burst, resulting in distinct flame-shaped or dot-and-blot bleeding patterns. Seeing these signs during an eye exam is an urgent systemic warning that the patient is at a higher risk for a stroke or cardiac event.

Vascular Blockages and Degeneration

Retinal Vein Occlusion (RVO)

Often referred to as a “stroke in the eye,” a retinal vein occlusion occurs when a blood clot blocks a primary vein draining blood away from the eye. This blockage creates an immediate, massive backup of fluid and pressure. The upstream capillaries rapidly become engorged and burst open, spilling blood across the tissue in a dramatic “blood and thunder” pattern. A Central Retinal Vein Occlusion affects the entire retina, creating widespread retina bleeding and severe visual loss, while a Branch Retinal Vein Occlusion remains localized to a smaller quadrant.

Wet Age-Related Macular Degeneration (AMD)

While dry AMD progresses slowly, the wet form is an aggressive disease that causes rapid bleeding behind retina tissue. Wet AMD occurs when fragile, abnormal new vessels sprout up from the choroid layer underneath the eye, breaking through the protective membrane beneath the macula. Because these new vascular branches are poorly formed, they continuously leak fluid and blood directly into the central retinal layers, destroying the light-sensitive photoreceptor cells responsible for sharp, straight-ahead vision.

Mechanical Friction and Physical Trauma

Head or Eye Trauma

Direct physical trauma to the eye socket from a punch, sports ball, or industrial accident generates sudden, intense compressive forces that tear the retinal vessels. Indirect trauma can be just as damaging. Severe head injuries from motor vehicle accidents create powerful acceleration-deceleration forces that cause the internal vitreous gel to move violently within the skull. This shifting gel pulls aggressively on the underlying tissue, tearing blood vessels and provoking a sudden retina hemorrhage.

Posterior Vitreous Detachment (PVD)

As a normal part of the aging process, the clear, jelly-like vitreous substance filling the center of the eye slowly liquefies and shrinks. By the time most individuals reach their 70s, this gel peels away from the back of the eye. In most cases, it separates cleanly.

However, if the vitreous gel is abnormally adherent to a specific blood vessel, it will tug on that vessel as it detaches. This traction can tear the vessel, causing localized bleeding onto the surface of the retina or generating a cloud of dark, cobweb-like floaters in the vitreous cavity.

Blood Chemistry, Elevation, and Medications

High-Altitude Retinopathy (HAR)

Ascending to elevations above 10,000 feet exposes the body to profound atmospheric hypoxia. To keep the brain and eyes oxygenated, the ocular blood vessels dilate significantly to maximize blood volume. This intense vasodilation raises the internal pressure within the microcapillaries. Combined with the direct stress of low oxygen on the vessel walls, blood can seep out into the surrounding tissue, forming transient, altitude-driven hemorrhages that generally resolve once the individual descends to sea level.

Systemic Hematologic Conditions (Leukemia and Anemia)

Systemic blood disorders alter how blood flows and clots, which directly explains what causes bleeding behind the retina. In leukemia, a massive overproduction of white blood cells makes the blood thick and sludgy, slowing circulation and causing vascular blockages.

Conversely, severe anemia reduces the blood’s oxygen-carrying capacity. This localized starvation damages the inner endothelial cells lining the eye’s blood vessels, causing them to break down and leak. This often produces a unique lesion known as a Roth spot—a hemorrhage featuring a pale, white center.

Anticoagulant and Antiplatelet Medications

Prescription blood thinners do not typically break the eye’s blood vessels on their own. Instead, they interfere with chemical clotting factors or prevent blood platelets from clumping together to seal wounds.

If a patient on blood thinners experiences a minor, spontaneous micro-tear from underlying diabetes or high blood pressure, the medication prevents the body from capping the leak. This transforms what would have been a tiny, self-limiting leak into a much larger, more visually damaging pool of blood.

Evaluating these overlapping risk factors helps answer what causes blood behind your eye. Because a bleeding retina is highly intertwined with your broader cardiovascular and systemic health, discovering any unexplained leakage warrants a comprehensive health assessment to address the true root cause.

Common Symptoms of a Retinal Hemorrhage

A retinal hemorrhage primarily manifests as a sudden change in vision. Because the retina entirely lacks pain receptors, a bleeding retina occurs without any physical pain, itching, or pressure.

The onset of these symptoms is typically sudden and generally impacts only one eye. Depending on the size of the bleed and where the blood accumulates, the visual changes can range from minor, subtle distortions to a complete wall of darkness.

Can a Retinal Hemorrhage Occur Without Symptoms?

Yes, it is entirely possible to have a retina hemorrhage and experience absolutely zero noticeable symptoms. This occurs when the bleeding is minor and confined to the peripheral (outer) edges of the retina, well away from the macula and your central visual axis.

Because the peripheral retina maps our side vision—which lacks the high-contrast detail of our central vision—a tiny cluster of blood spots in retina walls may not cast a large enough shadow for the brain to consciously register. Furthermore, the human brain is highly adept at automatically “filling in” minor blind spots by using visual data from the surrounding tissue or the other eye.

Consequently, asymptomatic hemorrhages are frequently discovered by surprise during routine, comprehensive dilated eye exams. Catching a quiet, non-symptomatic retina bleeding event is highly valuable; it provides an early warning that an underlying condition like high blood pressure or early diabetic retinopathy is starting to damage your blood vessels, allowing you to intervene before your central vision is threatened.

Direct Visual Signs of Retinal Bleeding

When blood escapes a broken blood vessel, it physically blocks light from striking the photoreceptor cells or escapes forward into the vitreous gel. This physical blockage generates distinct visual disruptions.

Sudden Onset of Floaters

If a hemorrhaging retina leaks blood directly into the clear, jelly-like vitreous humor filling the center of the eye, the red blood cells clump together. As these microscopic clumps drift through the clear gel, they cast distinct shadows onto the underlying retina. Patients perceive this as a sudden, unprovoked shower of dark specks, cobwebs, dots, or hair-like strands drifting across their field of vision. A massive leak can create a dense cloud of floaters that completely obscures sight.

Blurry Central Vision and Distortion

When bleeding behind retina tissue impacts the central macula, it physically lifts or disrupts the tightly packed photoreceptors responsible for your sharpest focus. This can cause severe generalized blurring.

It can also trigger metamorphopsia—a specific structural distortion where straight lines, such as door frames, window panes, or lines of text on a page, appear noticeably bent, wavy, or crooked.

Reddish Tint or Haze

If a moderate amount of blood dissolves uniformly throughout the vitreous gel rather than clumping, it can act like a colored camera filter. This causes a person to perceive a persistent reddish haze, pinkish wash, or smoky fog over everything they look at.

Developed Blind Spots (Scotomas)

A localized, thick pool of blood sitting on top of the retina forms a physical barrier that stops light completely. This results in a localized blind spot or shadow in your field of vision, known clinically as a scotoma. The physical size, shape, and density of this dark spot correspond directly to the scale of the hemorrhage beneath it.

Recognizing these visual warning signs is key to addressing the issue before permanent damage sets in. If you ever experience a sudden influx of floaters, wavy lines, or a shadow across your eye, it is vital to treat it as a medical emergency and seek an immediate dilated eye evaluation to isolate what causes bleeding behind the retina and protect your vision.

Diagnostic Tests Used to Identify a Retinal Hemorrhage

An accurate diagnosis of a retinal hemorrhage requires an eye care specialist to directly inspect the posterior structures of the eye. Because the retina is hidden at the very back of the globe, routine external observation is insufficient to catch internal bleeding.

The foundation of a proper evaluation is a comprehensive dilated eye exam. Specialized eye drops widen the pupil, granting the doctor a clear view of the retinal landscape, the optic nerve, and the primary vascular branches. Shining a bright light through an ophthalmoscope allows the practitioner to evaluate the size, shape, and distribution of any active bleeding.

To look deeper than the surface, clinicians rely on two advanced imaging technologies:

Optical Coherence Tomography (OCT)

This non-invasive imaging test functions like an optical ultrasound, utilizing light waves to capture high-resolution, cross-sectional slices of the retina. An OCT scan allows your doctor to see through the microscopic layers of tissue, pinpointing the exact depth of a hemorrhage and measuring any associated swelling or fluid accumulation.

Fluorescein Angiography

To map dynamic blood flow, a specialized fluorescent dye is injected into a vein in the patient’s arm. As this dye travels through the eye’s circulatory network, a rapid-fire sequence of photographs tracks its movement. This diagnostic test highlights hidden vascular blockages, active leakage points, and the development of fragile, abnormal new vessels that frequently trigger a retinal hemorrhage.

Anatomical Classification: The Types of Retinal Hemorrhage

The classification of a retinal hemorrhage is entirely dependent on its precise structural depth within the tissue layers. The anatomical location directly determines what the bleed looks like under a microscope, how it behaves, and how severely it will impact a patient’s eyesight.

Preretinal Hemorrhage

This type of bleeding occurs in the boundary space situated between the front surface of the retina and the back boundary of the vitreous gel. Because the blood is trapped in a fluid pocket, gravity causes the red blood cells to settle downward, creating a highly distinct boat-shaped or D-shaped visual pocket. A large preretinal hemorrhage physically blocks light from entering the eye, causing a sudden, large shadow across your field of vision.

Intraretinal Hemorrhage

This bleeding occurs directly within the core layers of the retinal tissue itself. If the bleed is deep within the structural matrix, it manifests as small, dark “dot-and-blot” shapes, which are hallmark signs of diabetic complications. If the leak occurs closer to the surface in the nerve fiber layer, the blood spreads horizontally along the neural pathways. This creates a feathery, “flame-shaped” appearance commonly associated with severe high blood pressure or retinal vein blockages.

Subretinal Hemorrhage

This represents a highly dangerous form of bleeding that develops in the deep space beneath the sensory retina. As blood pools here, it physically strips the light-sensitive photoreceptor cells away from the choroid layer, which serves as their primary source of oxygen and nutrients. Subretinal hemorrhages appear as dark, well-defined masses. They are closely linked to wet age-related macular degeneration and trauma, often leaving behind permanent central blind spots if they compromise the macula.

Retinal Hemorrhage vs. Subconjunctival Hemorrhage

While both conditions are described as “eye bleeding,” they represent completely opposite ends of the medical spectrum regarding severity, location, and visual risk.

A subconjunctival hemorrhage is an entirely superficial event. It occurs on the outside surface of the eye, directly beneath the clear membrane that covers the white sclera. Because it is on the exterior, it is vividly visible in a mirror as a bright red patch. It is usually benign, caused by a minor spike in localized pressure from a strong sneeze, a heavy cough, or eye rubbing. Like a simple bruise, it safely absorbs back into the body within a week or two without ever impacting your vision.

Conversely, a retinal hemorrhage occurs deep inside the eye on the neural architecture at the very back of the globe. It is completely invisible to the naked eye and can only be seen using specialized dilation equipment. Unlike a superficial bruise, a retinal bleed directly damages the tissue responsible for sight, acts as a visual threat, and almost always points to a serious systemic illness that requires targeted medical intervention.

Potential Long-Term Complications of Untreated Bleeding

Ignoring an active retinal hemorrhage or leaving its underlying cause unmanaged significantly elevates the risk of permanent, irreversible blindness. Stagnant blood trapped within the ocular layers releases iron and other cellular byproducts that are chemically toxic to delicate photoreceptor cells over extended periods. As the underlying vascular disease progresses, it can trigger a cascade of secondary structural failures within the eye:

Tractional Retinal Detachment

Persistent bleeding and fluid leakage often stimulate the growth of abnormal fibrous scar tissue on the surface of the retina. As this scar tissue contracts over time, it creates an intense mechanical pull that can physically lift and tear the retina away from its supportive back wall, resulting in catastrophic visual loss.

Neovascular Glaucoma

When chronic vascular blockages or diabetes starve the retina of oxygen, the tissue enters a state of ischemia. In a desperate bid to survive, the retina secretes a distress hormone known as Vascular Endothelial Growth Factor (VEGF). This chemical triggers the chaotic growth of fragile new blood vessels across the iris. These abnormal vessels can wrap around and clog the eye’s natural fluid drainage angles, causing an abrupt, incredibly painful spike in intraocular pressure that rapidly destroys the optic nerve.

Macular Scarring

When blood pools directly within the macula, the natural healing process eventually replaces the highly sensitive, specialized neural cells with non-functional scar tissue. Once this fibrosis is established, the photoreceptors cannot regenerate. This leaves the patient with a permanent central scotoma, severely compromising their ability to read, drive, or recognize faces.

FAQs

What is retinal hemorrhage?

Retinal hemorrhage is bleeding that occurs within the retina due to damaged or leaking blood vessels.

What causes retinal hemorrhage?

Common causes include diabetes, high blood pressure, eye trauma, retinal vein occlusion, blood disorders, and certain systemic diseases.

What are the symptoms of retinal hemorrhage?

Symptoms may include blurred vision, floaters, blind spots, distorted vision, or sudden vision loss. Some cases cause no noticeable symptoms.

Is retinal hemorrhage an emergency?

It can be. Sudden vision changes or vision loss should be evaluated promptly by an eye care professional.

Can diabetes cause retinal hemorrhage?

Yes. Diabetic retinopathy is one of the most common causes of retinal hemorrhage due to damage to small retinal blood vessels.

How is retinal hemorrhage diagnosed?

Doctors typically use a dilated eye exam, retinal imaging, optical coherence tomography (OCT), and other specialized eye tests.

Can retinal hemorrhage heal on its own?

Small hemorrhages may resolve naturally, but treatment depends on the underlying cause and severity of the bleeding.

What treatments are available for retinal hemorrhage?

Treatment may include managing the underlying condition, laser therapy, injections, surgery, or observation in mild cases.

Can retinal hemorrhage lead to blindness?

Severe or untreated cases may cause permanent vision impairment or vision loss, particularly if the macula is affected.

When should I see a doctor?

Seek immediate medical attention if you experience sudden vision changes, flashes of light, new floaters, or partial vision loss.

Conclusion

A retinal hemorrhage is an important warning sign that should never be ignored. While some cases may be minor, others can indicate serious underlying health conditions that require prompt diagnosis and treatment. Because retinal bleeding can affect vision and sometimes progress without obvious symptoms, regular eye examinations are essential, especially for individuals with diabetes, hypertension, or other vascular conditions.

Understanding the common causes of retinal hemorrhage can help you recognize potential risks and seek medical care early. Addressing the underlying condition is often the most effective way to prevent further damage and preserve vision.

If you notice sudden visual changes, new floaters, or unexplained vision loss, consult an eye specialist as soon as possible. Early intervention can play a crucial role in protecting long-term eye health and reducing the risk of permanent complications.

Read more: 10 Things to Expect Before and After Hip Replacement Surgery

Sources

• National Eye Institute (NEI) – Retinal Disorders
• American Academy of Ophthalmology (AAO)
• Mayo Clinic – Eye Conditions and Vision Disorders
• Cleveland Clinic – Retinal Diseases Overview
• MedlinePlus – Retinal Disorders
• Merck Manual Consumer Version – Retinal Conditions