Cat Eye Discharge: Causes and When to Worry

A little is normal

A small amount of clear or slightly reddish-brown tear staining in the inner corner of the eye, wiped away during grooming, is usually normal. What raises concern is discharge that increases, changes color, becomes thick or crusty, or comes with squinting, redness, or a cat pawing at the eye.

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Common causes

Watery eyes and discharge in cats are frequently tied to upper respiratory infections, which are very common and often caused by feline herpesvirus or calicivirus. Conjunctivitis, allergies, irritants like dust or smoke, and blocked tear ducts can all cause weepy eyes, especially alongside sneezing.

Reading the discharge

Clear, watery discharge often points to mild viral, allergic, or irritant causes. Thick yellow or green discharge suggests a bacterial infection, while discharge with pronounced redness, squinting, cloudiness, or obvious pain can signal an ulcer or a more serious eye condition that needs quick attention.

Supportive care and stress

For mild viral flare-ups, gently wiping away discharge with a warm, damp cloth and keeping your cat comfortable and hydrated helps. Because stress can trigger herpesvirus flare-ups, reducing stress matters; a calming aid such as [VetriScience Composure](/products/vetriscience-composure-calming-chews) may help sensitive cats stay settled during stressful periods.

When to see the vet

See your vet if discharge is thick, colored, or bloody, if one eye is affected, or if you notice squinting, swelling, cloudiness, a visible third eyelid, or signs of pain. Eye problems can worsen fast, so prompt evaluation protects your cat's vision.