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Cat conjunctivitis, pink eye explained

Conjunctivitis is the most common eye problem in Indian cats. The eye membrane goes red and swollen, with watery or sticky discharge and squinting. In most cats it starts with feline herpesvirus (FHV-1). Here is what the signs mean, how it differs from cat flu, and when to act fast.

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Quick answer

Cat conjunctivitis (pink eye) shows as red or swollen eye membranes, watery or sticky discharge, squinting, and a partly closed eye. In India the most common trigger is feline herpesvirus (FHV-1), along with bacteria, chlamydia, and dust. Most cases are a Monitor, but a cat holding the eye shut, cloudiness, or a kitten off food is Urgent, see a vet.

At a glance

What the signs may mean

What you seeWhat it may point toSeverity
Slight redness, a little wateringEarly irritationMonitor
Red swollen membrane, sticky discharge, squintingEstablished conjunctivitisMonitor
Eye held shut, cloudiness, visible pain, a kitten off foodPossible deeper involvementUrgent
Clear, bright, open eye with no dischargeLikely normalNormal

Severity labels follow PawCheck's Normal / Monitor / Urgent screening scale. They are a guide, not a diagnosis.

About this condition

Cat conjunctivitis, pink eye explained

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What it looks like

Red or pink swollen membrane around the eye, watery or sticky yellow discharge, squinting, and the cat pawing at the eye or keeping it half shut. One or both eyes can be affected.

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FHV-1, the common cause in India

Feline herpesvirus (FHV-1) is behind most cases, often flaring with stress. Bacteria, chlamydia, and dust also trigger it. Crowded or shelter cats catch it most easily.

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Cats most affected

Kittens, cats in multi-cat homes, and flat-faced breeds like Persians. Any cat under stress or with a weak immune system is more prone to flare-ups.

Conjunctivitis or cat flu?

How to tell them apart

Conjunctivitis often comes as part of cat flu (an upper-respiratory infection). Telling them apart helps you judge how urgent it is.

 Conjunctivitis aloneCat flu (with conjunctivitis)
EyesRed, watery or stickyRed eyes plus sneezing and a runny nose
AppetiteUsually normalOften reduced
Other signsNoneFever, tiredness, mouth ulcers, drooling
Usual severityMonitorUrgent in kittens

⚠ When to see a vet without waiting

  • The cat holds the eye completely shut or cannot open it
  • The surface of the eye looks cloudy or has a visible spot
  • A kitten stops eating, is very tired, or struggles to breathe through its nose
  • Thick green or bloody discharge
  • Sudden swelling of the eye or eyelid
  • No improvement within three to five days

When in doubt, a vet visit is always the safe choice. PawCheck helps you judge how quickly to act, it does not replace that visit.

Is it contagious?

Can it spread?

The common causes, feline herpesvirus and chlamydia, are contagious between cats, so a cat with pink eye should be kept apart from other cats and have its own bowls and bedding. Wash your hands after touching the eye.

Spread to humans is rare. If you have young children or anyone with low immunity at home, basic hygiene around the cat is enough in most cases.

PawCheck screening

PawCheck screens the cat eye as one of its cat eye conditions, returning a Normal, Monitor, or Urgent severity read from a single photo in under 10 seconds. It helps you decide whether to watch at home or see a vet. Free on Android, 5 scans a month.

Common questions

Pet owners ask

What does cat conjunctivitis look like?+
It shows as a red or pink swollen membrane around the eye, watery or sticky discharge, squinting, and the cat keeping the eye half shut or pawing at it. One or both eyes can be affected.
What causes conjunctivitis in cats?+
The most common cause in India is feline herpesvirus (FHV-1), often flaring with stress. Bacteria, chlamydia, and dust also trigger it. It spreads easily in multi-cat and shelter settings.
Is cat conjunctivitis the same as cat flu?+
Not quite. Conjunctivitis is the eye inflammation. Cat flu is a broader upper-respiratory infection that often includes conjunctivitis plus sneezing, a runny nose, and reduced appetite. Cat flu in a kitten is more serious.
Is cat conjunctivitis contagious?+
Yes, to other cats, because herpesvirus and chlamydia spread between them. Keep an affected cat separate with its own bowls and bedding. Spread to humans is rare.
When should I see a vet about my cat's eye?+
See a vet if the eye is held shut, looks cloudy, is painful, has thick or bloody discharge, or if a kitten stops eating or seems unwell. Any eye the cat cannot open should be handled as urgent.
Can PawCheck screen my cat's eyes?+
Yes. PawCheck's eye scanner screens the cat eye from a photo and returns a Normal, Monitor, or Urgent severity result in under 10 seconds. It is a wellness screening tool, not a veterinary diagnosis.

Further reading: MSD Veterinary Manual; Cornell University College of Veterinary Medicine. This page is general information and does not replace an examination by a qualified veterinarian.

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Related reading: Cat eye discharge and watery eyes · Cat sneezing and eye discharge: cat flu signs · Persian cat health in India

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PawCheck is a wellness screening tool. Not a veterinary diagnostic device. Always consult a qualified veterinarian.