August 30, 2025
Haw's syndrome in cats
Understanding Haw’s Syndrome in Cats: A Comprehensive Guide.
A rare eye condition every cat parent should know about:
At Riri Vet Unit, we believe that every pet owner deserves to understand the conditions that may affect their furry companions. One such condition, often misinterpreted or overlooked, is Haw’s Syndrome — a unique and somewhat mysterious issue mostly seen in cats.
Let’s take a closer look at what Haw’s Syndrome is, how it presents, what causes it, how it spreads, and most importantly, how to manage and prevent it.
What is Haw’s Syndrome?
Haw’s Syndrome refers to a condition where the third eyelid (nictitating membrane) in both eyes becomes prominently visible in cats. This third eyelid normally stays hidden, but when it becomes visible, it gives your cat a “half-asleep” or “haunted” appearance. It can affect one or both eyes, but it’s commonly bilateral and non-painful.
This condition is often not a disease in itself but a sign of an underlying issue, especially linked to gastrointestinal disturbances.
Common Symptoms
Cats with Haw’s Syndrome often exhibit the following signs:
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Protrusion of the third eyelid in one or both eyes
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No obvious irritation or discharge from the eyes
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Mild diarrhea or soft stool (gastrointestinal upset)
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Lethargy or reduced activity
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Occasionally: mild fever or reduced appetite
It’s important to note that the eye itself appears normal otherwise — no redness, squinting, or tearing as would be seen in conjunctivitis or eye infections.
What Causes Haw’s Syndrome?
The exact cause of Haw’s Syndrome is still under investigation, but the condition is often associated with:
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Gastrointestinal infections, especially from intestinal parasites such as tapeworms
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Viral infections, such as feline panleukopenia
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Bacterial infections, sometimes of unknown origin
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Stress or trauma
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Idiopathic causes – where no clear reason is found
The most commonly implicated factor is gastrointestinal upset, especially from intestinal parasites. That’s why cats with this syndrome often show mild diarrhea or digestive discomfort.
Is It Contagious?
Haw’s Syndrome is not directly contagious, but the underlying cause — such as a parasite infection — can be. Parasites like tapeworms or roundworms can be passed from one cat to another, especially in multi-cat households or where proper deworming protocols are not followed.
Prevention
Here’s how to protect your cat from developing Haw’s Syndrome:
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Regular deworming — at least every 3 months
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Maintain a clean environment, especially litter boxes
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Avoid feeding raw or undercooked meat
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Routine vet check-ups to monitor for parasites or GI infections
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Vaccinate against common feline viruses
Also, avoid self-medicating your cat for eye problems — since the appearance of the third eyelid may not actually be an eye issue at all.
Final Thoughts from Riri Vet Unit
Haw’s Syndrome can look alarming — after all, your cat suddenly looks like something out of a spooky movie. But rest assured, it’s usually a mild and self-limiting condition, especially when identified early and treated with professional guidance.
If you ever notice your cat’s third eyelid showing, don’t panic — but do bring them in for a quick checkup at Riri Vet Unit. It could be as simple as a worm infestation, and with proper care, your cat will be back to their bright-eyed self in no time.
📞 For appointments, deworming, and consultations, reach us at 0714881000 or visit www.ririvetunit.com
📍We care for all kinds of animals with all kinds of love.
