Cat Eye Discharge: Causes, Care & When to See a Vet
Monitor closely
Quick answer
Cat eye discharge ranges from normal tear staining to signs of infection or injury. Mild, clear discharge often resolves with gentle cleaning, but colored, thick, or accompanied discharge with squinting needs veterinary evaluation to protect vision and comfort.
Common causes
Upper Respiratory Infections
Viral or bacterial infections like feline herpesvirus or calicivirus commonly cause watery, yellow, or green discharge from one or both eyes, often with sneezing or nasal congestion.
Conjunctivitis (Pink Eye)
Inflammation of the eye's lining can produce clear, yellow, or green discharge, redness, and squinting. Allergies, irritants, or infections may trigger it.
Corneal Injury or Ulcer
Scratches from play, foreign objects, or dry eye can cause excessive tearing, pawing at the eye, and thick discharge. These are painful and need prompt care.
Blocked Tear Ducts
Some cats, especially flat-faced breeds, have poor drainage causing brown staining under the eyes. This is usually cosmetic but can become infected.
Allergies or Irritants
Dust, pollen, smoke, or strong fragrances can trigger watery discharge and mild redness without other symptoms.
When to see a vet
- Yellow, green, or thick pus-like discharge
- Squinting, holding eye closed, or visible pain
- Cloudiness or change in eye color
- Swelling around the eye or eyelid
- Discharge accompanied by lethargy or appetite loss
- Pawing at the eye excessively
- Sudden blindness or bumping into objects
Home care tips
- Gently wipe away discharge with a clean, damp cotton ball (use separate balls for each eye)
- Warm compresses for 5-10 minutes can soften crusted discharge
- Keep your cat's environment free of smoke, dust, and strong fragrances
- Use a humidifier if dry air seems to irritate the eyes
- Do not use human eye drops or medications without veterinary guidance
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FAQ
Is a little eye discharge normal in cats?
Yes, small amounts of clear or brown-tinged discharge can be normal, especially after sleeping. However, increased amount, color change, or accompanying symptoms warrant monitoring or veterinary check.
Can I use human eye drops on my cat?
No. Many human eye drops contain ingredients unsafe for cats. Only use medications prescribed by your veterinarian to avoid worsening the condition or causing toxicity.
Why does my cat have brown discharge under their eyes?
Brown staining usually indicates porphyrins in tears oxidizing on fur, common in flat-faced breeds or cats with blocked tear ducts. It's often cosmetic but should be checked if it becomes thick or smelly.
How do I clean my cat's eye discharge safely?
Use a soft, damp cotton ball or gauze with warm water. Wipe from the inner corner outward, using a fresh cotton ball for each eye. Never touch the eyeball directly.
When should I take my cat to the vet for eye discharge?
Seek care if discharge is colored, thick, or accompanied by squinting, redness, swelling, behavior changes, or lasts more than 24-48 hours. Eye issues can progress quickly.