Why Is There Discharge From My Cat’s Eyes? A Practical Owner’s Guide

Waking up to find a little crust in the corner of your cat’s eye is usually nothing to panic about. But when the discharge becomes gooey, colored, or seems to bother your cat, it’s natural to worry. As a cat owner, you want to know what’s normal and what needs a vet visit. Let’s walk through the common causes of eye discharge, what the different colors and textures mean, and how you can help your cat feel better.

Normal vs. Abnormal Eye Discharge: What to Look For

First, know that a small amount of clear, watery discharge that dries into a tiny brownish crust in the inner corner of the eye is normal after a cat sleeps. This is just your cat’s natural tear film doing its job. However, if you notice any of the following, it’s time to pay closer attention:

• Thick, yellow or green discharge — often a sign of infection.
• Red or pink discharge — can indicate blood or severe inflammation.
• Sticky, mucus-like discharge — might suggest a foreign body or blocked tear duct.
• Discharge accompanied by squinting, pawing, or redness — your cat is uncomfortable.

If the discharge is persistent or your cat seems bothered, a vet check is the safest move. For cats with known sensitivities, environmental factors like dust or pollen can trigger eye issues, much like signs of food allergies in cats can show up as skin or eye irritation.

Common Causes of Eye Discharge in Cats

1. Allergies

Just like people, cats can have allergic reactions to pollen, dust, mold, or even certain ingredients in their food. Allergic conjunctivitis often causes clear, watery discharge and red, itchy eyes. If your cat also sneezes or has skin issues, allergies might be the culprit. You might notice that your cat’s symptoms flare up seasonally or after a change in diet. For more on this, check out our guide on why does my allergic cat sneeze so much, as sneezing and eye discharge often go hand in hand.

2. Upper Respiratory Infections (URIs)

Viral infections, especially feline herpesvirus and calicivirus, are very common in cats and often cause thick, yellow or green discharge from the eyes and nose. These infections are highly contagious among cats but are usually not transmissible to humans. Stress, a weakened immune system, or living in a multi-cat household can trigger flare-ups. A vet can prescribe supportive care like eye drops or antiviral medication.

3. Conjunctivitis (Pink Eye)

This is inflammation of the pink tissue lining the eyelids. It can be caused by infections, allergies, or irritants like smoke or dust. Symptoms include red, swollen eyes with clear or colored discharge. It’s uncomfortable for your cat and needs a vet’s diagnosis to determine the right treatment.

4. Blocked Tear Ducts

Some cats, especially flat-faced breeds like Persians and Himalayans, are prone to blocked tear ducts. This causes tears to overflow onto the face, leading to constant wetness and reddish-brown staining under the eyes. While not usually painful, it can lead to skin irritation or infection if not managed with regular gentle cleaning.

5. Foreign Objects or Injury

A speck of dust, a grass seed, or a scratch from a cat fight can cause sudden, profuse discharge and squinting. If you suspect an injury, do not try to remove anything from the eye yourself. Cover the eye gently with a clean, damp cloth and go to the vet immediately.

When to See the Vet

You don’t need to rush to the vet for every little crusty eye, but these signs warrant a professional look:

• Discharge lasts more than 24 hours or is getting worse.
• The discharge is yellow, green, or bloody.
• Your cat is squinting, keeping the eye closed, or pawing at it.
• The eye looks cloudy, red, or swollen.
• Your cat seems lethargic, stops eating, or has a fever.
• You notice a sudden change in behavior or vision.

Your vet will likely perform a simple eye exam, possibly stain the eye to check for scratches, and take a sample if an infection is suspected. Never use over-the-counter human eye drops on your cat, as they can be harmful.

How to Clean Your Cat’s Eyes at Home

For normal, mild discharge or for maintenance, you can gently clean your cat’s eyes. Here’s how:

• Use a soft, damp cloth or a sterile saline eye wash (ask your vet for a pet-safe brand).
• Gently wipe from the inner corner of the eye outward, using a fresh part of the cloth for each eye to avoid spreading infection.
• Never rub or scrub. Just dab and wipe softly.
• If your cat resists, stop and try later. Forcing it can cause stress or injury.

Regular grooming can also help reduce eye irritation. Cats with allergies or frequent eye issues often benefit from a clean environment and a consistent routine. If your cat is prone to hairballs, which can sometimes be linked to eye irritation from licking, you might want to read about how often to brush a cat prone to hairballs to keep them comfortable all around.

Can Allergies Cause Eye Discharge?

Absolutely. Allergies are a top cause of clear, watery eye discharge in cats. If your cat has seasonal symptoms or reacts to something in your home, you might also notice sneezing, itchy skin, or ear infections. Food allergies can also play a role, so if you suspect a dietary trigger, a vet-supervised elimination diet is the best approach. For a deeper dive into managing your cat’s allergies, our guide on hypoallergenic cat diet homemade food offers practical tips on what to try at home. Additionally, if you are bathing your cat to remove allergens from their fur, be sure to check how often to bathe a cat with allergies to avoid drying out their skin.

“A cat’s eyes are a window to their health. A little crust is normal, but a change in color or comfort is your cue to act.”

Prevention Tips for Healthy Eyes

While you can’t prevent every eye issue, you can reduce the risk:

• Keep your cat’s living space clean and free of dust and smoke.
• Use a humidifier in dry climates to keep eyes moist.
• Feed a balanced diet to support their immune system.
• Keep up with routine vet check-ups.
• Trim long facial fur around the eyes to prevent irritation.

Most eye discharge is manageable with a little attention and care. Trust your instincts. If something looks off, a quick call to your vet can save your cat from unnecessary discomfort. You know your cat best, so keep an eye on those eyes.