Your cat's eye is watering, or there is crust building up in the corner, and you are trying to work out if this is normal or something that needs a vet. Cat eye discharge is one of the most common reasons Indian cat owners book a vet visit, and the range of causes runs from completely harmless tear staining to a same-day emergency. Knowing what you are looking at helps you act at the right speed, not too fast and not too slow.
What Counts as Normal in a Cat's Eye
A small amount of clear discharge, especially first thing in the morning, is normal in most cats. Flat-faced breeds like Persians and Himalayans are more prone to visible tear staining because their shortened tear ducts do not drain as efficiently, so a permanent reddish-brown streak below the eye is often just cosmetic rather than a sign something is wrong. If the eye itself looks comfortable, no redness, no squinting, no swelling, and your cat is behaving normally, a little morning crust rarely needs any action.
The quick check: Clear discharge with a comfortable, open eye is usually fine. Any colour change, one-sided discharge, squinting, or a cat pawing at its face is where "normal" ends and "needs a look" begins.
Viral Conjunctivitis, Feline Herpesvirus Usually Monitor
Feline Herpesvirus (FHV-1)
Feline herpesvirus is the single most common cause of eye discharge in cats, particularly in kittens, rescued strays, and cats from multi-cat households or shelters common across Indian cities. It behaves like a cat cold: watery to mucousy discharge, sneezing, and mild eye redness, often affecting one eye more than the other.
What to look for: Clear to slightly cloudy discharge, frequent blinking, sneezing, and sometimes a mild fever or reduced appetite. Stress, including a house move or a new pet, commonly triggers a flare-up in cats that already carry the virus.
What to do: Mild cases often resolve on their own within a week with supportive care, keep the eye area clean with a damp cotton ball. Persistent or worsening discharge needs an assessment for conjunctivitis, since a secondary infection can develop on top of the virus and needs different care.
Bacterial Conjunctivitis Monitor
Bacterial Conjunctivitis, Often Secondary
Bacterial conjunctivitis frequently follows a viral infection that has weakened the eye's natural defences. It produces a thicker, more obviously coloured discharge than the viral form, and it is the type of discharge most owners describe as "gunky" or "gluey".
What to look for: Yellow or green discharge, eyelids crusted or stuck shut after sleep, and visible redness of the conjunctiva, the pink membrane lining the eyelid. Often starts in one eye and spreads to the other within a few days if untreated.
What to do: See a vet within 48 hours for antibiotic eye drops. A typical vet visit and course of drops for feline conjunctivitis costs roughly ₹400 to ₹900 at most Indian clinics. Do not use human eye drops, they are not formulated for a cat's eye.
Not Sure What Kind of Discharge You're Seeing?
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Download Free, Android ↗Blocked Tear Duct Monitor
Blocked Tear Duct, Common in Flat-Faced Breeds
When the nasolacrimal duct that normally drains tears into the nose gets blocked or is simply too short and narrow, tears overflow onto the face instead. This is extremely common in Persians, one of India's most popular pedigree cat breeds, and in other brachycephalic (flat-faced) cats.
What to look for: Persistent reddish-brown staining below the eye with no redness or swelling at the eye itself. The overflow is clear and the cat is otherwise completely comfortable. If you own a Persian, read our full Persian cat health guide for more breed-specific eye and face care.
What to do: A vet can confirm a blocked duct and flush it under sedation if needed, though many owners simply manage the cosmetic staining with daily gentle cleaning using a damp, soft cloth or a vet-approved tear stain remover.
Corneal Ulcer or Scratch Injury Urgent
Corneal Ulcer or Scratch Injury
Outdoor and community cats, common across Indian neighbourhoods, are at real risk of scratches to the eye from fights with other cats or contact with plants and debris. A scratched cornea can ulcerate quickly, and an ulcer left untreated risks permanent vision loss or even loss of the eye.
What to look for: Sudden, obvious pain, a cat holding the eye shut or pawing at it constantly, heavy watery discharge, and a visibly cloudy or dull patch on the surface of the eye itself.
What to do: This needs a same-day vet visit. Do not attempt to flush or put anything in the eye yourself, an unaddressed ulcer can perforate within days. Fluorescein stain testing at the clinic confirms what is going on quickly.
Glaucoma Urgent
Glaucoma
Glaucoma is a rise in pressure inside the eye that can cause blindness within days if untreated. Discharge in glaucoma is usually a minor, secondary symptom, the primary warning signs are far more dramatic and should never be waited out.
What to look for: A visibly enlarged or bulging eye, a cloudy or bluish cornea, dilated pupil that does not respond to light, and obvious pain such as the cat rubbing its face along the floor or avoiding being touched near the head.
What to do: This is a veterinary emergency, go to a clinic the same day. A full assessment for glaucoma confirms this with pressure testing, and acting early is the only way to save vision in the affected eye.
When to See a Vet, Quick Guide
- Same day: Bulging or cloudy eye, cat pawing frantically at the eye, sudden severe pain, suspected glaucoma or corneal ulcer
- Within 48 hours: Yellow or green discharge, swollen or stuck-shut eyelids, both eyes affected, discharge getting worse
- Within the week: Mild watery discharge with sneezing (possible herpesvirus), one eye slightly red without pain
- No action needed: Small amount of clear morning discharge, cat fully comfortable and behaving normally
Human eye drops, including Visine and Optrex, contain ingredients at concentrations that can harm a cat's eye. Only use products a vet has prescribed for your cat specifically. India's summer dust (March to May) and monsoon humidity (June to September) both raise the chance of mild eye irritation, so a comfortable eye that only waters occasionally in these seasons is not automatically a red flag.