Why Is My Cat’s Eye Red?

If you’ve noticed your cat’s eyes turning red, it’s natural to feel concerned. Red eyes in cats are not a diagnosis on their own, they’re a symptom. And this symptom can stem from something as minor as an environmental irritant to something as serious as an underlying illness. So, why are my cat’s eyes red? The answer depends on a variety of factors, including the presence of other symptoms, how long the redness has been present, and whether it affects one or both eyes. This blog will help you understand the most common causes of red eyes in cats and why it’s important to have your cat examined if their eyes don’t return to normal quickly. If you’re in the Fort Lauderdale area and you’re wondering “why is my cat’s eye red?” give Central Broward Animal Hospital a call at (954) 792-6223 or make an appointment today.

Causes of Red Eyes in Cats

Red eyes in cats can result from several possible issues, some minor and others more serious. Pinpointing the underlying cause requires a closer look at your cat’s behavior, environment, and medical history.

Conjunctivitis (Pink Eye)

One of the most frequent answers to why are my cat’s eyes red is conjunctivitis. This is an inflammation of the conjunctiva, the thin membrane covering the white part of the eye and the inner eyelids. Cats with conjunctivitis often have red, swollen eyes and may show discharge, squinting, or pawing at the face. Conjunctivitis in cats can result from viruses (like feline herpesvirus), bacteria, or even allergies. In some cases, the inflammation may affect only one eye at first, then progress to both. Feline herpesvirus, in particular, tends to flare up during times of stress or if your cat’s immune system is compromised.

Corneal Injuries or Ulcers

If your cat was recently in a scuffle or loves to explore tight spaces, they could have scratched their cornea. A corneal injury is another reason to ask, “why is my cat’s eye red?” These injuries are painful and often accompanied by constant squinting, eye rubbing, and watery discharge. Corneal ulcers can develop if a scratch or foreign object damages the outer layer of the eye. The redness you see is due to irritation or inflammation, and the eye may also appear cloudy. Without proper care, corneal damage can worsen quickly, so prompt veterinary evaluation is important.

Glaucoma

Glaucoma causes increased pressure within the eye, which damages the optic nerve over time. It’s a less common but serious cause of red eyes in cats. If your cat’s eye appears red, cloudy, and bulging, glaucoma might be to blame. This condition can lead to permanent vision loss if left untreated. Cats may also seem lethargic, lose interest in food, or show signs of discomfort. Since glaucoma typically affects only one eye at a time and progresses rapidly, it’s essential to act quickly.

Infectious Causes of Red Eyes

Red eyes can also result from systemic or localized infections. These can include viral, bacterial, or even parasitic causes.

Upper Respiratory Infections

Cats suffering from upper respiratory infections often present with eye-related symptoms, especially if the infection is caused by a virus like feline herpesvirus or calicivirus. If your cat’s eyes are red and they’re sneezing, congested, or lethargic, it may be a viral infection. These infections spread easily in multi-cat households or shelters. The eye symptoms such as redness, discharge, and swelling, can sometimes outlast the respiratory signs.

Uveitis

Uveitis is the inflammation of the uveal tract (the iris, ciliary body, and choroid). This condition can cause intense redness, squinting, tearing, and even visible changes in the shape or color of the iris. Uveitis often indicates a deeper issue. It can be linked to infections such as feline leukemia virus (FeLV), feline immunodeficiency virus (FIV), toxoplasmosis, or even cancer. Because it can lead to long-term damage or blindness, uveitis is a medical emergency.

Environmental and Allergic Triggers

When wondering why your cat’s eyes are red, don’t overlook your home environment. Everyday irritants and allergens could be the source of the problem.

Dust, Smoke, and Cleaning Products

Household cleaners, cigarette smoke, scented candles, or dust can irritate a cat’s eyes. Redness, along with watering or mild squinting, may occur if your cat’s exposed to these irritants. Cats are sensitive to strong odors and airborne particles. If the redness improves when they’re moved away from the area, it might be an environmental cause.

Seasonal or Food Allergies

Although less common, cats can have allergic reactions to pollen, mold, or certain ingredients in food. These allergies can cause itching, redness around the eyes, sneezing, and even skin problems. Unlike other conditions that typically affect one eye, allergic reactions often cause symptoms in both eyes. Redness related to allergies tends to come and go with exposure.

When Red Eyes in Cats Signal an Emergency

While some causes of red eyes are mild, others require urgent care. Below are signs that indicate your cat’s eye redness might be more than just a passing issue.

Symptoms That Require Immediate Veterinary Attention

If your cat displays any of the following in addition to red eyes, contact your vet right away:

Swelling around or in the eye
Yellow or green discharge
Pawing or rubbing at the eye constantly
Sudden vision problems (bumping into things)
One eye bulging noticeably
Redness that doesn’t improve within 24–48 hours

Any of these symptoms could point to infections, injuries, or internal eye pressure issues that can permanently affect your cat’s vision.

What to Expect at Central Broward for Red Eyes

If you bring your cat to Central Broward Animal Hospital with red eyes, our team will start with a thorough examination to identify the source of the issue.

Common Diagnostic Steps

To find out why your cat’s eyes are red, we may perform:

Ophthalmic Exam – A close look at the eye structures using magnification
Fluorescein Stain Test – Helps detect corneal ulcers or scratches
Schirmer Tear Test – Measures tear production
Tonometry – Tests intraocular pressure for signs of glaucoma
Blood Work or Viral Testing – If systemic illness is suspected

These tools allow your veterinarian to build a complete picture of your cat’s eye health and guide the next steps in treatment.

Why Early Veterinary Attention Matters

Waiting to address red eyes in cats can have long-term consequences. Whether the cause is minor or serious, prompt care ensures your cat is as comfortable and healthy as possible. Eye problems can worsen quickly especially if there’s infection, trauma, or pressure involved. Many causes of eye redness are treatable, but delay can make recovery harder and more costly. If you’ve been asking, “why is my cat’s eye red?” and haven’t found a clear answer, don’t wait. Residents in Fort Lauderdale can reach out to Central Broward Animal Hospital for help. Call (954) 792-6223 to schedule a visit and have your cat examined by our compassionate veterinary team.