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Bruising (Hematoma) in the Conjunctiva in cats

Author: Dr. med. vet. Gisa Löwe | Last modified: 06.02.2026

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A bruising (hematoma) in the conjunctiva in cats is an accumulation of blood under the thin, transparent membrane that covers the eye. This membrane is called the conjunctiva, and a hematoma in this area can be triggered by various causes affecting the eye or the surrounding area.

Can Occur with the Following Diseases:

Basics and possible causes

The conjunctiva is a thin mucous membrane that covers the inside of the eyelids and the front of the eyeball up to the cornea. It protects the eye from the environment and helps to keep it moist. A hematoma in this area occurs when blood vessels in or around the conjunctiva are damaged, leading to Bleeding.

Bruising in the conjunctiva can be caused by traumas, such as a blow to the eye or head. Blunt force, such as from falls, fights with other animals, or accidents, are also common triggers. Other possible causes include high blood pressure, blood coagulationBlood coagulation is a process that helps stop Bleeding when a blood vessel is damaged. Platelets and certain proteins in the plasma form a blood clot that seals the wound. disorders, infections, or inflammatory diseases that affect the blood vessels in the conjunctiva.

Certain systemic diseases such as hypertensionHypertension, or high blood pressure, is a condition in which the blood pressure in the arteries is consistently elevated. In dogs and cats, this can lead to damage to organs such as the heart, kidneys, and eyes, and requires medical treatment. (high blood pressure) or thrombopathies (blood coagulationBlood coagulation is a process that helps stop Bleeding when a blood vessel is damaged. Platelets and certain proteins in the plasma form a blood clot that seals the wound. disorders) can also lead to bruising in the conjunctiva. These diseases affect the integrity of the blood vessels or the Tendency to bleed of the body and can therefore cause Bleeding even without external influences.

Typical accompanying symptoms

Redness of the eye: A noticeable sign is an unusual redness of the eye, caused by the accumulation of blood in the conjunctiva.
Swelling: The affected area may appear swollen because the blood is trapped in the tissue.
Pain or discomfort: The cat may show signs of pain by closing or rubbing the affected eye more often.
Change in behavior: Some cats may appear irritated or withdrawn due to the pain or discomfort.
Tearing: Increased tearing may occur as the eye tries to eliminate the blood accumulation.
Reluctance to move: In some cases, the cat may want to move less, especially if the hematoma was caused by a trauma that causes Pain.

When to visit the vet?

A visit to the vet is urgently needed if the cat shows signs of Pain or the eye is very Swelling and red. Also, if the animal cannot open its eye or shows signs of visual impairment, a veterinarian should be consulted immediately.

If the hematoma occurs without an obvious injury, it could be a sign of a more serious underlying condition, such as high blood pressure or a blood coagulationBlood coagulation is a process that helps stop Bleeding when a blood vessel is damaged. Platelets and certain proteins in the plasma form a blood clot that seals the wound. disorder. In such cases, a veterinary examination is essential to identify and treat the underlying cause.

Another warning sign is if the hematoma does not get smaller after a few days or even gets bigger. This could indicate persistentPersistent means lasting or continuing for an extended period. In veterinary medicine, it can refer to chronic diseases or symptoms that do not subside. Bleeding or another complication that requires medical intervention.

Symptom recognition for animal owners and veterinary diagnostic procedures

Pet owners can recognize a hematoma in the conjunctiva by paying attention to the symptoms described above, especially a sudden redness or Swelling of the eye. It is important to observe the cat’s behavior to recognize signs of Pain or discomfort.

During a veterinary visit, the vet will first take a thorough medical historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits. and ask about possible causes for the traumaA trauma refers to a physical injury or damage caused by external force. Traumas can range from simple cuts to severe multiple injuries.. A physical examination, especially of the affected eye, will be performed to assess the extent of the hematoma and any accompanying injuries.

The veterinarian may also order blood tests to identify systemic causes such as blood coagulationBlood coagulation is a process that helps stop Bleeding when a blood vessel is damaged. Platelets and certain proteins in the plasma form a blood clot that seals the wound. disorders or high blood pressure. In some cases, diagnostic imagingDiagnostic imaging includes medical procedures that create images of the inside of the body to diagnose, monitor, or treat diseases and injuries. Examples include X-ray, ultrasound, computed tomography (CT), and magnetic resonance imaging (MRI). such as an ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. or X-rayX-ray is an imaging technique that uses X-rays to create images of the inside of the body. It is often used to diagnose bone fractures, lung diseases, and other conditions. may be necessary to determine the exact cause of the hematoma.

What can pet owners do and professional therapy options

At home, pet owners can take some measures to relieve the cat’s discomfort and prevent it from getting worse. It is important to prevent the cat from rubbing or scratching the affected eye. A protective collar can be helpful to prevent this.

A cool compress can be gently placed on the closed eye to reduce Swelling. Care should be taken to ensure that no pressure is exerted on the eye to avoid further damage.

It is important to keep the cat in a quiet environment to avoid stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being., which could worsen the symptoms. Pet owners should also make sure that the cat does not participate in activities in which it could injure itself again.

Medications or eye drops should only be administered after consulting a veterinarian, as improper use could worsen the condition. If the veterinarian prescribes medication, it should be administered exactly as directed.

Outlook on current research

Current research is increasingly focused on understanding the exact mechanisms that lead to the development of bruising in the conjunctiva in cats. Scientists are particularly investigating the role of coagulationCoagulation is the process of blood coagulation, in which liquid blood is transformed into a solid clot. This process is crucial for stopping Bleeding and promoting wound healing. disorders and the effects of traumaA trauma refers to a physical injury or damage caused by external force. Traumas can range from simple cuts to severe multiple injuries. or pressure on the sensitive blood vessels in the eye. There is evidence that genetic factors may play a role in influencing susceptibility to such bruising. Studies are trying to identify specific genetic markers that could increase the risk. In parallel, the role of environmental factors, such as diet and lifestyle, is being investigated to understand how these might influence the occurrence of hematomas in the conjunctiva.

Another area of research focuses on the development of new diagnostic procedures to determine the cause of conjunctival hematomas more precisely. This includes the application of advanced diagnostic imagingDiagnostic imaging includes medical procedures that create images of the inside of the body to diagnose, monitor, or treat diseases and injuries. Examples include X-ray, ultrasound, computed tomography (CT), and magnetic resonance imaging (MRI). techniques such as Optical Coherence Tomography (OCT), which provides a detailed view of the eye structure and can help to detect subtle changes early on. Work is also being done to improve blood coagulationBlood coagulation is a process that helps stop Bleeding when a blood vessel is damaged. Platelets and certain proteins in the plasma form a blood clot that seals the wound. tests to obtain more accurate results that help identify underlying systemic problems.

In addition, research is being conducted to investigate how different treatment methods affect the healing of bruising in the conjunctiva. Both pharmacological approaches that affect blood coagulationBlood coagulation is a process that helps stop Bleeding when a blood vessel is damaged. Platelets and certain proteins in the plasma form a blood clot that seals the wound. and physical therapies that are intended to promote blood circulation and healing are being evaluated. New drugs are being tested in preclinical studies that specifically target the reduction of bruising while minimizing side effects. The results of these investigations could lead to new treatment protocols that shorten recovery time and improve the well-being of affected cats.

Frequently asked questions

What is bruising in the conjunctiva in cats? A bruising in the conjunctiva in cats is an accumulation of blood that forms under the transparent outer layer of the eye. This accumulation of blood is often visible as a red or purple spot.
How do I recognize bruising in the conjunctiva of my cat? You can recognize a bruising in the conjunctiva of your cat by a reddish or bluish discoloration on the white part of the eye. This discoloration can vary in size and is sometimes accompanied by Swelling.
Is bruising in the conjunctiva painful for my cat? In most cases, a bruising in the conjunctiva is not painful for the cat. However, Pain can occur with large hematomas or accompanying injuries, and the cat may rub or blink its eye more often.
What causes can lead to bruising in the conjunctiva? Causes for a bruising in the conjunctiva can be traumaA trauma refers to a physical injury or damage caused by external force. Traumas can range from simple cuts to severe multiple injuries. from bumps or scratches, blood coagulationBlood coagulation is a process that helps stop Bleeding when a blood vessel is damaged. Platelets and certain proteins in the plasma form a blood clot that seals the wound. disorders, or high blood pressure. Sometimes it also occurs without any recognizable cause.
Should I take my cat to the vet if it has bruising in the conjunctiva? Yes, it is advisable to see a veterinarian to clarify the cause of the bruising and ensure that there are no more serious health problems.
How is bruising in the conjunctiva treated? The therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. for a bruising in the conjunctiva depends on the cause. Often no special treatment is necessary, and the bruising heals on its own. Targeted treatment may be necessary for underlying health problems.
Can bruising in the conjunctiva be avoided? Bruising in the conjunctiva cannot always be avoided, but regular veterinary examinations and a healthy lifestyle can minimize risk factors.
How long does it take for bruising in the conjunctiva to heal? The healing time for bruising in the conjunctiva varies, but is usually about one to two weeks, depending on the size of the hematoma and the general health of the cat.
Can bruising in the conjunctiva lead to permanent damage? In most cases, bruising in the conjunctiva does not lead to permanent damage. However, a comprehensive examination should be carried out in the event of repeated occurrence or large hematomas.
Is bruising in the conjunctiva a sign of a serious illness? A bruising in the conjunctiva can be an indicationIndication refers to a valid reason or rationale for using a specific treatment, medication, or medical procedure. It is based on the diagnosis and the patient's clinical condition. of an underlying health problem, such as high blood pressure or a blood coagulationBlood coagulation is a process that helps stop Bleeding when a blood vessel is damaged. Platelets and certain proteins in the plasma form a blood clot that seals the wound. disorder. Therefore, a veterinary examination is important to clarify this.