If you’ve noticed your cat’s eyes looking red or irritated, it’s natural to be concerned. Red eyes in cats can be caused by something as minor as dust irritation — or as serious as an infection or underlying disease. Since your cat’s eyes are sensitive and vital to their well-being, it’s important to understand the potential causes and what to do next.
In this guide, we’ll explain why your cat’s eyes may appear red, the common symptoms to watch for, and how you can help your cat recover quickly and comfortably.
What Does It Mean When a Cat’s Eyes Are Red?
When your cat’s eyes turn red, it usually indicates inflammation of the tissues surrounding the eye, particularly the conjunctiva — the pink membrane lining the eyelids. This condition, known as conjunctivitis, is one of the most common reasons for eye redness in cats. However, redness can also be caused by other issues, such as infections, injuries, or increased pressure within the eye.
Redness may appear in one or both eyes, and you may notice additional symptoms such as squinting, excessive tearing, or discharge. Understanding the root cause is crucial to identifying the most effective treatment.
Common Causes of Red Eyes in Cats
Let’s look at some of the most common reasons behind red or irritated eyes in cats:
a) Conjunctivitis (Pink Eye)
This is the most frequent cause of eye redness in cats. Conjunctivitis can be triggered by:
- Bacterial or viral infections (like feline herpesvirus or calicivirus)
- Allergies to dust, pollen, smoke, or cleaning products
- Irritants such as shampoo, debris, or foreign particles
You may notice symptoms like watery or thick discharge, swelling, and squinting. Mild cases often resolve with gentle cleaning and prescribed eye drops, but persistent infections require veterinary care.
b) Upper Respiratory Infections
Just like humans, cats can catch colds. Feline upper respiratory infections (URIs) are typically caused by viruses or bacteria and often result in watery eyes, sneezing, and nasal discharge. The eyes may appear red and inflamed due to continuous irritation and the spread of infection to the conjunctiva.
c) Corneal Ulcers or Scratches
Cats that play rough, fight, or brush against sharp objects may injure the surface of their eyes. These corneal ulcers or scratches are excruciating and can cause:
- Redness and swelling
- Constant blinking
- Cloudiness or discharge
This is an emergency — untreated ulcers can lead to permanent damage or vision loss. Seek veterinary help immediately if you suspect an eye injury.
d) Glaucoma
Glaucoma occurs when the pressure inside the eye increases, damaging the optic nerve. Along with redness, affected cats may show:
- Cloudy or bulging eyes
- Dilated pupils
- Vision loss or reluctance to move
This condition requires urgent medical attention. Early detection is crucial in preventing blindness.
e) Uveitis
Uveitis refers to inflammation of the inner structures of the eye, often caused by trauma, infections (like FIV, FeLV, or toxoplasmosis), or autoimmune diseases. Symptoms may include:
- Redness
- Sensitivity to light
- Squinting or rubbing the eyes
Since uveitis can be linked to serious underlying illnesses, it’s important to get your cat checked promptly.
f) Allergies and Environmental Irritants
Some cats are sensitive to pollen, cigarette smoke, perfumes, or dust. If your cat’s eyes are red and watery but they’re otherwise acting normal, allergies might be the cause. Keeping your home clean, using air purifiers, and avoiding scented products can help reduce irritation.
g) Foreign Objects
A speck of dust, grass seed, or hair can easily get trapped under your cat’s eyelid, leading to redness and discomfort. Never try to remove it yourself — visit a vet who can safely examine and clean the eye.
Symptoms That May Accompany Eye Redness
In addition to visible redness, you may notice:
- Watery or thick discharge (clear, yellow, or green)
- Squinting or keeping one eye closed
- Frequent blinking or pawing at the eyes
- Swelling around the eyelids
- Cloudy or dull eye surface
- Behavioral changes, like hiding or reduced appetite
The combination of these symptoms can help your vet identify whether the issue is mild or severe.
What You Can Do at Home
If your cat’s eye redness appears mild and they’re otherwise healthy, here are some basic care tips you can follow until you reach the vet:
- Keep the area clean: Gently wipe away discharge using a soft cotton pad dipped in warm water.
- Avoid irritants: Do not use human eye drops or medications unless prescribed by your vet.
- Monitor their behavior: Watch for signs of worsening redness, squinting, or discharge.
- Keep their environment dust-free: Use unscented cleaning products and avoid smoking near your pet.
When to See a Veterinarian
You should seek veterinary care if:
- Redness persists for more than 24–48 hours
- There is thick discharge, swelling, or cloudiness
- Your cat keeps rubbing or closing one eye
- They appear to be in pain or losing vision
Your veterinarians will carry out a detailed eye examination, which might involve checking for infections, measuring eye pressure to detect glaucoma, and using a fluorescein dye test to identify any corneal ulcers or scratches.
Treatment depends on the cause:
- Eye drops or ointments for infection or inflammation
- Antibiotics or antiviral medications for bacterial or viral causes
- Pain relief and anti-inflammatory drugs for comfort
- Surgical intervention in severe injury or glaucoma cases
Preventing Eye Problems in Cats
Prevention goes a long way in keeping your cat’s eyes healthy:
- Schedule regular vet check-ups, especially for older cats.
- Keep vaccinations up to date (especially for feline herpesvirus).
- Maintain good hygiene — clean their bedding and litter box regularly.
- Keep the hair around your cat’s eyes neatly trimmed to avoid irritation or debris buildup.
- Provide proper nutrition to support eye and immune health.
Final Thoughts
Red eyes in cats can range from minor irritations to signs of serious health issues. Paying attention to symptoms early can make all the difference. Always remember — never ignore changes in your cat’s eyes, as they can worsen quickly without proper care.
If your cat’s eyes are persistently red or watery, consult your veterinarian for an accurate diagnosis and treatment plan. With timely care and a clean, comfortable environment, your cat’s eyes will stay healthy, bright, and pain-free.
