Why Does My Cat Have Eye Discharge? Causes & Care

Most cat eye discharge is minor, but the color and consistency tell you a lot. Clear, occasional crust is usually normal; thick, colored, or one-sided discharge often signals something that needs a vet.

What 'normal' looks like

Cats produce a small amount of clear tears that evaporate or form a tiny dry crust in the corner of the eye, especially after sleep. A little brown or black debris at the inner corner — more visible on light-coated cats — is generally harmless and just needs a quick wipe. The problem is when discharge changes in amount, color, or which eye it affects.

Common causes of abnormal discharge

• Upper respiratory infection ('cat cold'). The single most common cause of runny, watery, or goopy eyes in cats, especially kittens and multi-cat homes. Often comes with sneezing and nasal congestion.
• Conjunctivitis. Inflammation of the pink tissue around the eye, causing redness, swelling, and discharge. It can be viral, bacterial, or allergy-related.
• Blocked tear ducts. When ducts can't drain tears, they spill over the face as clear or stained runoff.
• Corneal scratch or ulcer. A painful defect on the eye's surface, usually from rough play or a foreign body, causing squinting and watery eyes.
• Breed anatomy. Flat-faced breeds like Persians have shallow eye sockets and often tear constantly — mostly cosmetic, but the wet fur can irritate the skin.

Safe at-home cleaning

For mild, clear crust, you can gently clean the area:

1. Use a warm, damp cotton ball — one per eye, never shared, to avoid spreading infection.

2. Wipe from the inner corner outward, using a fresh side as needed. Don't press on the eyeball.

3. Dry the area afterward; trapped moisture irritates skin and deepens staining.

Our eye care guide covers daily routines for both cats and dogs, and the shop carries vet-style eye washes safe for the skin around the eye.

When to see a vet

Don't Guess at Drops

It's tempting to borrow dog or human eye drops, but the wrong product can worsen a corneal ulcer or mask a serious infection. Use only a cleanser meant for the skin around the eye, and leave medicated drops to your vet's prescription. This is general guidance, not a diagnosis — when in doubt, a short exam beats a week of guessing.

The bottom line

A little clear crust is part of owning a cat. Anything thick, colored, one-sided, or accompanied by squinting or sickness is a vet conversation, not a wipe-and-wait situation. Catching eye problems early protects both comfort and vision.

Sources: VCA Animal Hospitals — Eye and Tear Duct Disorders in Cats; Cornell University College of Veterinary Medicine — Feline Health Topics.