Third eyelid in cats: causes, symptoms, and when to worry

troisième paupière chat

Seeing a cat's third eyelid appear can be alarming. This strange white or pinkish veil that covers part of the eye is often a sign that a problem is developing.

In some cases, it can be benign and temporary. But sometimes, a visible third eyelid in cats reveals an illness, pain, or significant fatigue.

Understanding this phenomenon allows for quick action and the prevention of more serious ocular complications.

Summary

Cat's third eyelid: why it appears
The most frequent causes
Associated symptoms to monitor
When to consult a veterinarian
Possible treatments
Cat's third eyelid: prevention and advice

Cat's third eyelid: why it appears

The cat's third eyelid, also called the nictitating membrane, is a thin membrane located in the inner corner of the eye.

An essential protective role

This membrane serves to:

  • Protect the eye
  • Hydrate the cornea
  • Remove dust

Why does it become visible?

In a healthy cat, this membrane is almost invisible. When it appears, it often means that something is disturbing the body.

According to International Cat Care, a visible third eyelid can be linked to ocular, digestive, or neurological disorders.

The most frequent causes

Several reasons can explain a visible third eyelid in cats.

Benign causes

  • Significant fatigue
  • Stress
  • Dehydration

More serious causes

Certain diseases can also cause this symptom:

  • Conjunctivitis
  • Viral infection
  • Intestinal parasites
  • Haw's Syndrome
Cause Severity Associated symptoms
Fatigue Low Drowsiness
Conjunctivitis Medium Red eye
Infection High Fever, lethargy

A cat with green eyes

Associated symptoms to monitor

A cat's third eyelid rarely appears alone.

Frequent signs

  • Red eyes
  • Watering eyes
  • Frequent blinking
  • Loss of appetite

Observe overall behavior

The cat's body language is essential to understanding its state. A change in posture or behavior can help detect pain.

You can also learn to decipher certain behaviors in this article on the meanings of a cat wagging its tail.

A cat closing its eyes

When to consult a veterinarian

In some cases, prompt consultation is essential.

Urgent situations

  • Third eyelid visible for several days
  • Significant discharge
  • Closed or swollen eye
  • Apathetic cat

A sometimes misleading symptom

This sign can reveal a deeper problem, particularly digestive or neurological.

Duration Recommended Action Alert Level
A few hours Monitor Low
1 to 2 days Consult if persistent Medium
Several days Veterinarian quickly High


Possible treatments

Treatment always depends on the identified cause.

The most frequent care

  1. Veterinary eye drops
  2. Antiparasitic treatment
  3. Antibiotics

Never use human products

A cat's eyes are extremely sensitive. An unsuitable product can significantly worsen the situation.

To preserve your companion's daily comfort, discover our anti-choking velvet bow tie for cats, designed to avoid any discomfort and respect neck sensitivity.

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Cat's third eyelid: prevention and advice

Preventing the appearance of a cat's third eyelid involves good hygiene and regular monitoring.

Good habits

  • Regular deworming
  • Eye monitoring
  • Maintain a balanced diet

Important follow-up

Observing your cat's eyes weekly often helps detect a problem before it worsens.

Habit Frequency Benefit
Deworming Regular Prevention
Eye observation Weekly Early detection
Veterinary consultation Annual Overall follow-up


A visible cat's third eyelid is always a signal to be taken seriously. By quickly observing symptoms and consulting if necessary, you effectively protect your companion's health and comfort.

FAQ: cat's third eyelid

Why do we see a cat's third eyelid?

It becomes visible in case of fatigue, illness, or irritation.

Is it serious?

Not always, but it requires careful monitoring.

Can stress cause this symptom?

Yes, stress and fatigue can make the membrane visible.

When to consult a veterinarian?

If the symptom lasts several days or worsens.

Can you treat this yourself?

It is not recommended to use products without veterinary advice.

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